Digital Equipment VT520, VT525 Programming Manual

VT520/VT525VideoTerminal

ProgrammerInformation

Order Number: EK-VT520-RM. A01

July 1994

Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.

DEC, OpenVMS, VT, and the DIGITAL logo are trademarks of Digital Equipment Corporation. ADDS is a trademark of Applied Digital Data Systems, Inc.

IBM, ProPrinter, and PS/2 are registered trademarks of International Business Machines Corporation. MS–DOS is a registered trademark and Windows is a trademark of Microsoft Corporation. SCO is a trademark of Santa Cruz Operations, Inc. TVI is a trademark of TeleVideo, Inc. UNIX is a registered trademark of UNIX System Laboratories, Inc. WY and WYSE are registered trademarks of Wyse Technologies.

All other trademarks and registered trademarks are the property of their respective holders. The Energy Star emblem does not represent EPA endoresement of any product or service.

For copies of manuals, contact your local sales ofﬁce.

This document was prepared using VAX DOCUMENT Version 2.1.

Introduction

This manual provides detailed information for advanced users, consultants, and programmers. This manual has the following parts, chapters, and appendices:

• Part I, VT520 Video Terminal

• Part II, VT520 ANSI Mode

Preface

• Chapter 1, Overview

• Chapter 2, Set-Up

• Chapter 3, Desktop Features

• Chapter 4, ANSI Control Functions Summary

• Chapter 5, ANSI Control Functions

• Chapter 6, SCO Console Emulation

• Chapter 7, Character Sets

• Chapter 8, Keyboard Processing

• Chapter 9, Communications

• Chapter 10, Printer Port

• Part III, VT520 ASCII Emulation

• Chapter 11, ASCII Emulations and Control Functions

• Chapter 12, ASCII Escape Sequences

• Chapter 13, Deﬁning and Loading ASCII Character Fonts

• Appendix A, VT Keyboard Legend Data

• Appendix B, Enhanced PC Keyboards

• Appendix C, ASCII Keycodes and Local Functions

• Appendix D, VT520 Termcap Data

• Appendix E, ANSI Control Function Index

iii

Conventions

The following conventions are used in this manual:

Set-Up features Terminal Set-Up menu selections appear in boldface type.

Alt/Ctrl/Print Screen

Characters in control functions

Parameters Parameters appear in italic type. Note Provides general information.

How to Use This Manual

The VT520 Video Terminal Programmer Information is written for four audiences: an advanced user, who needs to know more about the terminal Set-Up features; a programmer, who develops application programs; a software product support person, who provides assistance to application programmers and users; and a hardware systems engineer, who need more information on terminal connections.

Advanced User

If you have read the VT520 Video Terminal Installation and Operating Information manual and need more information on the the terminal Set-Up

features, you may wish to refer to the following:

Multiple keys are separated by a slash (/) and should be pressed in combination. That is, all three keys

Print Screen

Control function characters are in boldface type. Below each character is a column/row number that indicates the character’s position in a standard code table. For example:

ESC # 6

1/11 2/3 3/6

are pressed down at the same time.

(

Control function

(

Column/row numbers

Alt,Ctrl

, and

• Index

• Chapter 1—Overview—Provides a brief summary of the product.

• Chapter 2—Set-Up—Describes each entry in the Set-Up menus in the order that is displayed in the terminal.

• Chapter 3—Desktop Features—Provides a more in-depth description of the desktop features of the terminal.

• Chapter 6—Keyboard Processing—Describes the differences in the types of keyboard layouts supported, local functions, and accessibility aids.

Programmer

If you are using ANSI control functions for your program, then you may wish to start with Part II of the manual:

• Chapter 4—ANSI Control Function Summary— Provides a tutorial section on Control Functions and information on designing and down-line loading a Soft Character set (soft font). In this chapter, the Control Functions are grouped according to the task to be performed. The information on each Control Function is very brief. If you need more information, the mnemonic at the end of the line item refers to a command section in Chapter 5.

• Chapter 5—ANSI Control Functions—Provides in-depth information on each control function listed in alphabetic order according to the mnemonic.

• Chapter 2—Set-Up—Lists the Set-Up factory defaults at the end of this chapter, with their host control code mnemonic.

• Chapter 6—Keyboard Processing—Describes the keyboard layouts, keyboard-to-host interface, keypad sequences, local functions, LEDs controls, languages, accents, scan codes, and control codes.

• Chapter 9—Communications—Describes the serial communications from the terminal to the host ports and the hardware and software handshaking.

• Chapter 10—Printer Port—Describes the parallel printer port and the switching sequences for the modes supported.

• Appendix A—VT Keyboard Legend Data

• Appendix B—Enhanced PC Keyboard Legend Data

• Appendix D—VT500 Termcap Data

If you are developing a application program for a SCO Console, then you may wish to refer to:

• Chapter 6—SCO Console Emulation—Describes the SCO Console mode, including the Control Functions relative to the SCO Console applications.

If you are using ASCII control functions for your program, then you may wish to start with Part III of the manual:

• Chapter 11—ASCII Emulations and Control Functions— Provides an overview of the ASCII emulation, the coding notation, and the symbols used in the ASCII sequence tables.

• Chapter 12—ASCII Escape Sequences—Summarizes the ASCII escape and control sequences for the various ASCII emulation modes, according to the task to be performed.

• Chapter 13—Deﬁning and Loading ASCII Character Fonts – Provides speciﬁc information on loading font banks and designing an ASCII character font.

• Appendix C—ASCII Keycodes and Local Functions

Software Product Support

If you are helping a user or programmer with an application, then you may wish to refer to the following:

• Appendix E—ANSI Control Function Index—Lists the control functions by their ﬁnal character, which makes them easier to ﬁnd in a program. The mnemonic at the end of the line item refers to a command in Chapter 5, listed in alphabetic order.

• Index—Lists control functions by mnemonic or by name and lists other subjects by topic.

• Chapter 5—ANSI Control Functions—Provides in-depth information on speciﬁc control functions.

• Chapter 6—Keyboard Processing—Lists the scan codes Make and Break sequences.

• Appendix D—VT500 Termcap Data—Provides the Termcap information for ANSI emulations.

Hardware Systems Engineer

If you are helping a user to install the terminal or to operate within a speciﬁc environment, then you may wish to refer to the following:

• Index—Search by topic.

• Chapter 1—Overview Provides a brief summary of the product.

• Chapter 2—Set-Up Describes each entry in the order that is displayed in the terminal, starting with the Actions menu and lists the modes supported. Also lists the Set-Up factory defaults.

• Chapter 9—Communications—Describes the serial communications from the terminal to the host ports, pin numbers and signals, and the hardware and software handshaking.

• Chapter 10—Printer Port—Describes the parallel printer port, pin numbers and signals, and modes supported.

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Part I VT520 Video Terminal

1 Overview

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

1.2 Communications Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

1.3 Keyboard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

1.4 Printer Port Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.5 Display and Text Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.5.1 ANSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.5.2 ASCII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.6 Enhanced Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

1.7 Desktop Productivity Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

1.8 Character Set Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

1.9 Ergonomics (Human Factors) Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

1.10 Field-Upgradable Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

1.11 Comparison with previous VT Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6

2 Set-Up

2.1 Entering Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

2.1.1 Effects of Entering Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

2.1.2 Set-Up Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

2.1.3 Power-On Settings and Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

2.1.4 Self-test Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2.1.5 Context Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2.1.6 Set-Up Summary Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2.1.7 Set-Up Status Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2.1.8 Status Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

2.1.9 Keyboard Indicator Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

2.2 Set-Up Screen Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

2.3 Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8

2.3.1 On-Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8

2.3.2 Save Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.3.3 Restore Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.3.4 Exit Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.4 Actions Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.4.1 Clear Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.4.2 Clear Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2.4.3 Reset this Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10

2.4.4 Restore Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10

2.4.5 Clock, Calculator, Show Character Sets . . . . . . . . . . . . . . . . . . . . . . . . 2–11

vii

2.4.6 Banner Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11

2.5 Multiple Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11

2.5.1 Enabling and Controlling the Session Conﬁguration . . . . . . . . . . . . . . 2–12

2.5.2 Multiple Sessions using a Terminal Server with TD/SMP . . . . . . . . . . 2–12

2.5.3 Multiple Sessions using SSU Host Software . . . . . . . . . . . . . . . . . . . . 2–12

2.5.4 Opening Another Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

2.5.5 Restoring an Interrupted Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

2.5.6 Session Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

2.6 Session Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

2.6.1 Select Session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14

2.6.2 Session Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14

2.6.3 Pages per Session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14

2.6.4 Soft Character Sets/Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16

2.6.5 Save Settings for All and Restore Settings for All . . . . . . . . . . . . . . . . 2–16

2.6.6 Copy Settings from Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2.6.7 Update Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2.7 Resetting and Restoring Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18

2.7.1 Reset Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18

2.7.2 Restore Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18

2.8 Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19

2.8.1 Lines per Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–20

2.8.1.1 Auto Resize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–20

2.8.2 Lines per Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–20

2.8.3 Review Previous Lines Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–21

2.8.4 Columns per Page, Clear on Change . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.5 Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.6 Scrolling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.7 Screen Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.8 Cursor Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.9 Cursor Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–22

2.8.10 Writing Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.8.11 Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.8.12 Auto Wrap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.8.13 New Line Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.8.14 Lock User Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.8.15 Show Control Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–24

2.8.16 CRT Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–24

2.8.17 Energy Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–24

2.8.17.1 Warning Bell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–25

2.8.18 Overscan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–25

2.8.19 Framed Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–25

2.8.20 Screen Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–27

2.9 Color Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–28

2.9.1 Assign Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–28

2.9.2 Alternate Text Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–30

2.9.3 Deﬁne Colors Dialog Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–31

2.9.4 Select Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2.9.5 ASCII Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2.9.6 Bold and Blink Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2.9.7 Erase Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2.9.8 Reverse and Blank Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2.9.9 Intensity Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2.10 Terminal Type Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2.10.1 Emulation Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

viii

2.10.2 Terminal ID to Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.10.3 VT Default Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.10.4 PCTerm Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.10.5 7-Bit NRCS Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.10.6 Transmit 7-Bit Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.11 ASCII Emulation Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2.12 Keyboard Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–36

2.12.1 Keyboard Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2.12.2 Deﬁne Key Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2.12.2.1 Copy of Key Default—Moving a Standard Function . . . . . . . . . . . . 2–38

2.12.2.2 Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.12.2.3 Modiﬁer Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.12.2.4 Creating a New Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.12.2.5 Examples of Creating New Functions . . . . . . . . . . . . . . . . . . . . . . 2–39

2.12.2.6 Correcting a Mistake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–40

2.12.2.7 Creating A New Alphanumeric Key or Keyboard Layout . . . . . . . . 2–40

2.12.2.8 Examples of Creating New Alphanumeric Keys . . . . . . . . . . . . . . . 2–40

2.12.2.9 User-Deﬁned Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–41

2.12.2.10 Programming Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–41

2.12.3 Save Key Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.12.4 Recall Key Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.12.5 Lock Key Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.12.6 Caps Lock Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.12.7 Keyclick, Warning Bell, and Margin Bell Volume. . . . . . . . . . . . . . . . . 2–42

2.12.7.1 Visible Bell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.12.8 Keyboard Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.12.9 Auto Repeat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.12.10 Data Processing Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.12.11 Application Cursor Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.12.12 Application Keypad Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–44

2.12.13 Map PC Keyboard to VT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–44

2.12.14 Ignore Missing Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–44

2.13 Communication Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–45

2.13.1 Communication Port Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2.13.2 Word Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–47

2.13.3 Parity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–47

2.13.4 Stop Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–47

2.13.5 Transmit Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–48

2.13.6 Receive Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–48

2.13.7 Transmit Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–48

2.13.8 Receive Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–49

2.13.9 Flow Control Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–49

2.13.10 Transmit Rate Limit, Fkey Rate Limit. . . . . . . . . . . . . . . . . . . . . . . . . 2–49

2.13.11 Ignore Null Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–50

2.13.12 Local Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–50

2.13.13 Half Duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–50

2.13.14 Auto Answerback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–50

2.13.15 Answerback Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–50

2.13.16 Answerback Concealed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–51

2.14 Modem Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–52

2.14.1 Enable Modem Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–52

2.14.2 Disconnect Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–52

2.14.3 Modem High Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–53

2.14.4 Modem Low Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–53

2.15 Printer Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–54

2.15.1 Port Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–54

2.15.2 Print Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–54

2.15.3 Printer Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–55

2.15.4 Printer Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–55

2.15.4.1 DEC/ISO Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2.15.4.2 PC Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2.15.5 Print Extent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2.15.6 Print Terminator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2.15.7 Serial Print Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2.15.8 2-Way Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–57

2.15.9 Transmit Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–57

2.15.10 Receive Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–57

2.15.11 Word Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–57

2.15.12 Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–58

2.15.13 Stop Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–58

2.15.14 Same as Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–58

2.16 Tabs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–58

2.17 Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–59

2.18 Set-Up Factory Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–61

3 Desktop Features

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

3.2 Invoking Desktop Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

3.3 Calculator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2

3.4 Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

3.5 Review Previous Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

3.6 Character Set Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

3.6.1 Show Character Sets feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

3.6.2 Banner message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8

3.7 Keyboard Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8

Part II VT520 ANSI Mode

4 ANSI Control Functions Summary

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1

4.2 Control Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1

4.3 Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

4.3.1 Sequence Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

4.3.2 Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6

4.3.3 Control Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6

4.3.3.1 Control Sequence Introducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6

4.3.3.2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7

4.3.3.3 Intermediate Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8

4.3.3.4 Final Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8

4.3.4 Device Control Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8

4.3.5 Using Control Characters in Sequences . . . . . . . . . . . . . . . . . . . . . . . . 4–9

4.3.6 7-Bit Code Extension Technique. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9

4.4 Working with 7-Bit and 8-Bit Environments . . . . . . . . . . . . . . . . . . . . . . . 4–10

4.4.1 Conventions for Codes Received by the Terminal . . . . . . . . . . . . . . . . . 4–10

4.4.2 Conventions for Codes Sent by the Terminal . . . . . . . . . . . . . . . . . . . . 4–10

4.5 Showing Control Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–11

4.6 Terminal Management Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–15

4.7 ANSI Control Function Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–16

4.7.1 Sessions Management Control Functions . . . . . . . . . . . . . . . . . . . . . . . 4–16

4.7.2 Window Management Control Functions . . . . . . . . . . . . . . . . . . . . . . . 4–17

4.7.3 Audible Attributes Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . 4–18

4.7.4 Color Selection Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–18

4.7.5 Visual Attributes Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 4–20

4.7.6 Editing Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–21

4.7.7 Text Processing Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–22

4.7.8 Graphic Character Sets Control Functions. . . . . . . . . . . . . . . . . . . . . . 4–25

4.7.9 Keyboard Processing Control Functions . . . . . . . . . . . . . . . . . . . . . . . 4–27

4.7.10 Printer Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–33

4.7.11 Terminal Management Control Functions . . . . . . . . . . . . . . . . . . . . . . 4–34

4.7.12 Terminal Management—Communications Control Functions . . . . . . . 4–39

4.7.13 Terminal Synchronization Control Functions . . . . . . . . . . . . . . . . . . . . 4–41

4.7.14 Reports Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–42

4.8 VT52 Mode Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–45

5 ANSI Control Functions

ANSI Conformance Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1

CBT—Cursor Backward Tabulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

CHA—Cursor Horizontal Absolute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

CHT—Cursor Horizontal Forward Tabulation . . . . . . . . . . . . . . . . . . . . . . 5–4

CNL—Cursor Next Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4

CPL—Cursor Previous Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5

CPR—Cursor Position Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5

CRM—Show Control Character Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6

CUB—Cursor Backward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7

CUD—Cursor Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7

CUF—Cursor Forward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7

CUP—Cursor Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–8

CUU—Cursor Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–8

DA1—Primary Device Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–9

DA2—Secondary Device Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–11

DA3—Tertiary Device Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–12

DCH—Delete Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13

DDD1, DDD2, DDD3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–14

DECAAM—Set/Reset Auto Answerback Mode . . . . . . . . . . . . . . . . . . . . . . 5–15

DECAC—Assign Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–16

DECALN—Screen Alignment Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–17

DECANM—ANSI Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18

DECANM Exit—Exiting ANSI (VT52) Mode . . . . . . . . . . . . . . . . . . . . . . . 5–19

DECARM—Autorepeat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–19

DECARR—Select Auto Repeat Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20

DECARSM—Set/Reset Auto Resize Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5–21

DECATC—Alternate Text Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22

DECATCBM—Set/Reset Alternate Text Color Blink Mode. . . . . . . . . . . . . 5–23

DECATCUM—Set/Reset Alternate Text Color Underline Mode . . . . . . . . . 5–23

DECAUPSS—Assigning User-Preferred Supplemental Sets . . . . . . . . . . . 5–24

DECAWM—Autowrap Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25

DECBBSM—Bold and Blink Style Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5–25

DECBI—Back Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–26

DECBKM—Backarrow Key Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–26

DECCANSM—Conceal Answerback Message Mode . . . . . . . . . . . . . . . . . 5–27

DECCAPSLK—Caps Lock Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–28

DECCARA—Change Attributes in Rectangular Area . . . . . . . . . . . . . . . . 5–28

DECCIR—Cursor Information Report (Terminal to Host) . . . . . . . . . . . . . 5–30

DECCKD—Copy Key Default. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–31

DECCKM—Cursor Keys Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–32

DECCKSR—Memory Checksum Report . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–33

DECCOLM—Selecting 80 or 132 Columns per Page . . . . . . . . . . . . . . . . . 5–34

DECCRA—Copy Rectangular Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–35

DECCRTST—CRT Saver Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–36

DECCRTSM—Set/Reset CRT Save Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 5–37

DECDC—Delete Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–37

DECDHL—Double-Width, Double-Height Line . . . . . . . . . . . . . . . . . . . . . 5–38

DECDLD—Dynamically Redeﬁnable Character Sets Extension. . . . . . . . . 5–39

DECDMAC—Deﬁne Macro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–45

DECDLDA—Down Line Load Allocation . . . . . . . . . . . . . . . . . . . . . . . . . 5–47

DECDWL—Double-Width, Single-Height Line . . . . . . . . . . . . . . . . . . . . . 5–48

DECECM—Erase Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–48

DECEKBD—Extended Keyboard Report . . . . . . . . . . . . . . . . . . . . . . . . . 5–49

DECELF—Enable Local Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–51

DECERA—Erase Rectangular Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–52

DECES—Enable Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–53

DECESKM—Enable Secondary Keyboard Language Mode . . . . . . . . . . . . 5–53

DECFI—Forward Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–54

DECFRA—Fill Rectangular Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–55

DECFWM—Set/Reset Framed Windows Mode . . . . . . . . . . . . . . . . . . . . . . 5–56

DECHDPXM—Set/Reset Half-Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . 5–56

DECHEM—Hebrew Encoding Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–57

DECHEBM—Hebrew/N-A Keyboard Mapping Mode . . . . . . . . . . . . . . . . . 5–58

DECHWUM—Host Wake-Up Mode (CRT and Energy Saver) . . . . . . . . . . 5–59

DECIC—Insert Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–59

DECID—Identify Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–60

DECINVM—Invoke Macro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–61

DECIPEM—Enter/Return from IBM ProPrinter Emulation Mode . . . . . . . 5–62

DECKBD—Keyboard Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . 5–63

DECKBUM—Typewriter or Data Processing Keys . . . . . . . . . . . . . . . . . . 5–65

DECKLHIM—Keyboard LED’s Host Indicator Mode . . . . . . . . . . . . . . . . . 5–65

DECKPAM—Keypad Application Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 5–66

DECKPM—Key Position Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–66

DECKPNM—Keypad Numeric Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–67

DECLANS—Load Answerback Message . . . . . . . . . . . . . . . . . . . . . . . . . . 5–68

DECLBAN—Load Banner Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–69

DECLFKC—Local Function Key Control . . . . . . . . . . . . . . . . . . . . . . . . . 5–70

xii

DECLL—Load LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–71

DECLRMM—Left Right Margin Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–72

DECLTOD—Load Time of Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–72

DECMCM—Modem Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–73

DECMSR—Macro Space Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–73

DECNAKB—Greek/N-A Keyboard Mapping Mode . . . . . . . . . . . . . . . . . . . 5–74

DECNCSM—No Clearing Screen On Column Change Mode . . . . . . . . . . . 5–74

DECNKM—Numeric Keypad Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–75

DECNRCM—National Replacement Character Set Mode . . . . . . . . . . . . . 5–75

DECNULM—Null Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–76

DECNUMLK—Num Lock Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–76

DECOM—Origin Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–77

DECOSCNM—Set/Reset Overscan Mode (VT520 only) . . . . . . . . . . . . . . . 5–77

DECPAK—Program Alphanumeric Key . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–78

DECPCCM—Page Cursor-Coupling Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5–80

DECPCTERM—Enter/Exit PCTerm or Scancode Mode . . . . . . . . . . . . . . . 5–81

DECPEX—Print Extent Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–83

DECPFF—Print Form Feed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–83

DECPFK—Program Function Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–84

DECPKA—Program Key Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–87

DECPKFMR—Program Key Free Memory Report . . . . . . . . . . . . . . . . . . 5–88

DECPS—Play Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–89

DECRARA—Reverse Attributes in Rectangular Area . . . . . . . . . . . . . . . . 5–90

DECRC—Restore Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–92

DECRLCM—Right-to-Left Copy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–92

DECRLM—Right-to-Left Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–93

DECRPAK—Report All Modiﬁers/Alphanumeric Key State . . . . . . . . . . . . 5–94

DECRPDE—Report Displayed Extent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–95

DECRPFK - Report Function Key Deﬁnition . . . . . . . . . . . . . . . . . . . . . . . 5–96

DECRPKT—Report Key Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–96

DECRPL—Review Previous Lines Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 5–97

DECRPM—Report Mode - Terminal To Host . . . . . . . . . . . . . . . . . . . . . . . 5–98

DECRPSS—Report Selection or Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–102

DECRPTUI—Report Terminal Unit ID . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–104

DECRQCRA—Request Checksum of Rectangular Area . . . . . . . . . . . . . . . 5–105

DECRQDE—Request Displayed Extent . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–105

DECRQKD—Request Key Deﬁnition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–106

DECRQKT—Request Key Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–107

DECRQM—Request Mode - Host To Terminal . . . . . . . . . . . . . . . . . . . . . . 5–108

DECRQPKFM—Request Program Key Free Memory . . . . . . . . . . . . . . . . 5–111

DECRQPSR—Request Presentation State Report . . . . . . . . . . . . . . . . . . . 5–111

DECRQSS—Request Selection or Setting . . . . . . . . . . . . . . . . . . . . . . . . . 5–112

DECRQTSR—Request Terminal State Report . . . . . . . . . . . . . . . . . . . . . 5–113

DECCTR—Color Table Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–114

DECRQUPSS—Request User-Preferred Supplemental Set . . . . . . . . . . . . 5–115

DECRSPS—Restore Presentation State . . . . . . . . . . . . . . . . . . . . . . . . . . 5–116

DECRSTS—Restore Terminal State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–117

xiii

DECRSTS—Restore Terminal Color Table State . . . . . . . . . . . . . . . . . . . . 5–118

DECSACE—Select Attribute Change Extent . . . . . . . . . . . . . . . . . . . . . . 5–119

DECSASD—Select Active Status Display . . . . . . . . . . . . . . . . . . . . . . . . . 5–120

DECSC—Save Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–120

DECSCA—Select Character Protection Attribute . . . . . . . . . . . . . . . . . . . 5–121

DECSCL—Select Conformance Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–122

DECSCLM—Scrolling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–123

DECSCNM—Screen Mode: Light or Dark Screen . . . . . . . . . . . . . . . . . . . 5–123

DECSCP—Select Communication Port . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–124

DECSCPP—Select Columns Per Page . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–125

DECSCS—Select Communication Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 5–126

DECSCUSR—Set Cursor Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–127

DECSDDT—Select Disconnect Delay Time . . . . . . . . . . . . . . . . . . . . . . . . 5–128

DECSDPT—Select Digital Printed Data Type . . . . . . . . . . . . . . . . . . . . . . 5–129

DECSED—Selective Erase in Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–129

DECSEST—Energy Saver Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–130

DECSEL—Selective Erase in Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–131

DECSERA—Selective Erase Rectangular Area . . . . . . . . . . . . . . . . . . . . . 5–132

DECSFC—Select Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–133

DECSIN—Set Icon Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–134

DECSKCV—Set Key Click Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–135

DECSLCK—Set Lock Key Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–135

DECSLPP—Set Lines Per Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–136

DECSLRM—Set Left and Right Margins . . . . . . . . . . . . . . . . . . . . . . . . . 5–137

DECSMBV—Set Margin Bell Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–138

DECSMKR—Select Modiﬁer Key Reporting . . . . . . . . . . . . . . . . . . . . . . . 5–139

DECSNLS—Set Number of Lines Per Screen . . . . . . . . . . . . . . . . . . . . . . 5–140

DECSPMA—Session Page Memory Allocation . . . . . . . . . . . . . . . . . . . . . 5–141

DECSPP—Set Port Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–142

DECSPPCS—Select ProPrinter Character Set . . . . . . . . . . . . . . . . . . . . . 5–143

DECSPRTT—Select Printer Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–144

DECSR—Secure Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–144

DECSRC—Secure Reset Conﬁrmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–146

DECSSCLS—Set Scroll Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–146

DECSSDT—Select Status Display (Line) Type . . . . . . . . . . . . . . . . . . . . . 5–147

DECSSL—Select Set-Up Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–148

DECST8C—Set Tab at Every 8 Columns . . . . . . . . . . . . . . . . . . . . . . . . . 5–149

DECSTBM—Set Top and Bottom Margins . . . . . . . . . . . . . . . . . . . . . . . . 5–149

DECSTR—Soft Terminal Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–150

DECSTGLT—Select Color Look-Up Table . . . . . . . . . . . . . . . . . . . . . . . . . 5–151

DECSTRL—Set Transmit Rate Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–152

DECSTUI—Setting Terminal Unit ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–153

DECSWBV—Set Warning Bell Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–154

DECSWL—Single-Width, Single-Height Line . . . . . . . . . . . . . . . . . . . . . . 5–154

DECSZS—Select Zero Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–155

DECSWT—Set Window Title . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–156

DECTABSR—Tab Stop Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–157

xiv

DECTCEM—Text Cursor Enable Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–157

DECTID—Select Terminal ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–158

DECTME—Terminal Mode Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–159

DECTSR—Terminal State Report—Terminal to Host . . . . . . . . . . . . . . . . 5–160

DECTSR—Terminal State Report (Color Table Report) . . . . . . . . . . . . . . . 5–161

DECTST—Invoke Conﬁdence Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–162

DECUDK—User Deﬁned Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–163

DECUS—Update Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–169

DECVCCM—Vertical Cursor-Coupling Mode . . . . . . . . . . . . . . . . . . . . . . . 5–170

DECXCPR—Extended Cursor Position Report . . . . . . . . . . . . . . . . . . . . . . 5–170

DECXRLM—Transmit Rate Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–171

DL—Delete Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–172

DSR—Device Status Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–173

DSR—Cursor Position Report (CPR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–173

DSR—Data Integrity Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–174

DSR—Extended Cursor Position Report (DECXCPR response) . . . . . . . . . 5–174

DSR—Keyboard Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–175

DSR—Macro Space Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–176

DSR—Memory Checksum Report (DECCKSR) . . . . . . . . . . . . . . . . . . . . . 5–177

DSR—Operating Status Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–177

DSR—Printer Port Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–178

DSR—User-Deﬁned Keys Report (VT Level 4 or higher) . . . . . . . . . . . . . . 5–179

ECH—Erase Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–179

ED—Erase in Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–180

EL—Erase in Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–180

HPA—Horizontal Position Absolute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–181

HPR—Horizontal Position Relative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–181

HT—Horizontal Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–182

HTS—Horizontal Tab Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–182

HVP—Horizontal and Vertical Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–183

ICH—Insert Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–183

IL—Insert Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–184

IND—Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–184

IRM—Insert/Replace Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–185

KAM—Keyboard Action Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–185

LNM—Line Feed/New Line Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–186

LS—Locking Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–187

MC—Media Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–188

NEL—Next Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–191

NP—Next Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–191

PP—Preceding Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–192

PPA—Page Position Absolute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–192

PPB—Page Position Backward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–193

PPR—Page Position Relative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–193

RIS—Reset to Initial State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–194

RM—Reset Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–195

S7C1T—Send C1 Control Character to the Host . . . . . . . . . . . . . . . . . . . . 5–196

S8C1T—Send C1 Control Character to the Host . . . . . . . . . . . . . . . . . . . . 5–196

SCS—Select Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–197

Designating Character Sets (SCS Sequences) . . . . . . . . . . . . . . . . . . . . . . 5–197

SD—Pan Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–200

SGR—Select Graphic Rendition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–201

SRM—Local Echo: Send/Receive Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–204

SS—Single Shifts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–205

SM—Set Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–206

SU—Pan Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–207

TBC—Tab Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–207

VPA—Vertical Line Position Absolute . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–208

VPR—Vertical Position Relative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–208

6 SCO Console Emulation

6.1 SCO Console Emulation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1

6.1.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2

6.1.1.1 Local Function Keys in SCO Console Mode . . . . . . . . . . . . . . . . . . 6–2

6.1.1.2 PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2

6.1.1.3 VT Keyboard Key Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–6

6.2 VT520 SCO Console Control Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7

SCODFK—Deﬁne Function Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7

SCODPCC—Display PC Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–8

SCORC—Restore Saved Cursor Position . . . . . . . . . . . . . . . . . . . . . . . . . . 6–9

SCOSC—Save Current Cursor Position . . . . . . . . . . . . . . . . . . . . . . . . . . 6–9

7 Character Sets

7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

7.2 Character Sets Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

7.2.1 VT Graphic Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

7.2.2 PCTerm Graphic Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2

7.2.3 Control Character Sets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3

7.2.4 Character Set Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3

7.2.5 Characters Not in a Character Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3

7.3 VT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

7.3.1 Selecting Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

7.3.2 Character Set Mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

7.4 PCTerm Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

7.4.1 Selecting Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

7.4.2 Character Set Mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–5

7.5 SCO Console Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–5

7.6 Soft Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–5

7.6.1 Designing a Soft Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6

7.6.2 Coding the Soft Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9

7.6.3 Downloading Soft Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13

7.6.4 Designating the Soft Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14

7.6.5 Soft Character Set Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–15

7.6.6 Clearing a Soft Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–16

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8 Keyboard Processing

8.1 Overview—Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1

8.2 DEC VT Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2

8.3 VT Layout - PC Term Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2

8.4 Enhanced PC Layout - PCTerm Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–3

8.5 Enhanced PC Layout - VT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–3

8.5.1 DEC VT Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–3

8.5.2 IBM PC Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4

8.6 Main Key Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4

8.6.1 Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4

8.6.2 Tab Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4

8.6.3 Modiﬁer Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4

8.6.4 Caps Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–5

8.6.5 Left Alt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–5

8.6.6 Right Alt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–6

8.6.7 Alt Gr. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–6

8.7 Top Row Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–6

8.8 Editing Keypad Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–6

8.9 Cursor Keypad Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–7

8.10 Numeric Keypad Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–7

8.11 Local Function Key Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–9

8.11.1 Numeric Keypad Compose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–14

8.11.2 Accessibility Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–15

8.12 Controlling Keyboard LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–16

8.13 Keyboard Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–17

8.14 Switching Between Keyboard Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 8–18

8.14.1 Keystroke Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–20

8.14.2 Non-Spacing Accent Marks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–20

8.14.3 German . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–21

8.14.4 Hebrew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–21

8.15 Keystation Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–21

8.16 Scan Codes Sent in PCTerm Mode for EPC Keyboards . . . . . . . . . . . . . . . 8–23

8.17 Scan Codes Sent in PCTerm Mode for VT Keyboards . . . . . . . . . . . . . . . . 8–27

8.18 Control Codes and Keystrokes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–28

9 Communications

9.1 Introduction to Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–1

9.2 Physical Link Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–2

9.2.1 25-Pin Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–2

9.2.2 DEC Corporate Modular Jacks (MMJ) . . . . . . . . . . . . . . . . . . . . . . . . . 9–3

9.2.3 Connector Pins Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–3

9.2.3.1 Transmitted Data–TXD L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–4

9.2.3.2 Received Data–RXD L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–4

9.2.3.3 Request to Send–RTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–4

9.2.3.4 Clear to Send–CTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–4

9.2.3.5 Data Terminal Ready–DTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–5

9.2.3.6 Data Set Ready–DSR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–5

9.2.3.6.1 Modem Initiated Disconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . 9–5

9.2.3.6.2 Terminal Initiated Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . 9–5

9.2.3.6.3 Modem off line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–6

9.2.3.7 Receive Line Signal Detector–RLSD . . . . . . . . . . . . . . . . . . . . . . . 9–6

9.2.3.8 Speed Indicator–SPDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–6

9.2.3.9 Speed Select–SPDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–7

xvii

9.2.4 Half-Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–7

9.2.5 Supported Modem Conﬁgurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–7

9.2.5.1 CCITT Public Switched Telephone Network (2-wire only) . . . . . . . 9–7

9.2.5.2 CCITT Dedicated Line (2-Wire / 4-Wire) Data Network . . . . . . . . . 9–7

9.2.5.3 European Public Circuit Switched Data Network . . . . . . . . . . . . . 9–8

9.2.5.4 European Public Packet Switched Data Network (PSDN) . . . . . . . 9–8

9.3 Data Link Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–9

9.3.1 7- /8-Bit VT100/VT520 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–9

9.3.2 Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–10

9.3.2.1 Receive Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–10

9.3.2.2 Flow Control Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–10

9.3.2.2.1 No Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–11

9.3.2.2.2 XOFF/XON or XPC Flow Control . . . . . . . . . . . . . . . . . . . . . . . 9–11

9.3.2.2.3 DSR/DTR Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–12

9.3.2.2.4 Software and Hardware Combined Flow Control . . . . . . . . . . . 9–12

9.3.2.2.5 Flow Control Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–12

9.3.2.3 Show Control Character Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–13

9.3.2.4 Set-Up on Flow Control Handling . . . . . . . . . . . . . . . . . . . . . . . . . 9–13

9.3.2.5 When Disconnect Occurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–13

9.4 Features that Affect Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–13

9.4.1 Clear Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–14

9.4.2 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–14

9.4.3 Line Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–14

9.4.4 Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–15

9.4.4.1 Received Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–15

10 Printer Port

10.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1

10.2 Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1

10.2.1 Serial Port Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1

10.3 Parallel Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–2

10.3.1 Parallel Port Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–3

10.4 Print Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–3

10.4.1 Printer Controller Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–4

10.5 Print Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–4

10.6 Transmitting Print Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–4

10.6.1 DEC ANSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–4

10.6.2 IBM ProPrinter or Compatible Printer . . . . . . . . . . . . . . . . . . . . . . . . 10–5

10.6.2.1 Data Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–5

10.6.3 DEC ANSI with IBM ProPrinter Emulation . . . . . . . . . . . . . . . . . . . . 10–6

10.6.3.1 Data Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–7

10.7 Printer Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–7

10.8 Suspending Print Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–7

10.9 Aborting Print Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–7

Part III VT520 ASCII Emulation

xviii

11 ASCII Emulations and Control Functions

11.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–1

11.2 ASCII Emulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–1

11.2.1 Enhanced Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–2

11.3 Coding Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–2

11.3.1 Communication Flow Control with PCTerm Mode . . . . . . . . . . . . . . . . 11–3

11.3.2 Protecting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–3

12 ASCII Escape Sequences

12.1 ASCII Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–1

12.2 Terminal Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–4

12.3 Keyboard Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–5

12.4 Screen Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–10

12.4.1 Rectangular Area Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–28

12.4.1.1 Draw Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–31

12.4.1.2 Swap/Copy/Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–31

12.5 Printing/Sending Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–32

12.5.1 Sending Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–32

12.5.2 Graphics Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–36

13 Deﬁning and Loading ASCII Character Fonts

13.1 Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–1

13.1.1 PCTerm on US Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–1

13.1.2 WYSE and ADDS Enhanced Personalities . . . . . . . . . . . . . . . . . . . . . . 13–1

13.2 Loading, Deﬁning, and Selecting Character Sets . . . . . . . . . . . . . . . . . . . . 13–3

13.3 Designing a Character Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–5

A VT Keyboard Legend Data

A.1 Compose Processing and Non-spacing Diacritical Marks . . . . . . . . . . . . . . A–1

A.2 VT Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1

B Enhanced PC Keyboards

B.1 Summary of Non-Spacing Diacritical Marks . . . . . . . . . . . . . . . . . . . . . . . B–1

B.2 Enhanced PC Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2

C ASCII Keycodes and Local Functions

C.1 PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1

C.2 DEC VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–6

C.3 ASCII Local Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–9

D VT520 Termcap Data

D.1 Termcap Emulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1

D.1.1 Termcap Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1

D.1.2 Terminfo Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–2

xix

E ANSI Control Function Index

E.1 ANSI Index by Final Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E–1

Glossary

Index

Figures

1–1 Sample VT Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

1–2 Sample PC Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

2–1 Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

2–2 Set-Up Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

2–3 Set-Up Summary Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2–4 Main and Terminal Actions Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

2–5 Session Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

2–6 Session Page Memory Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15

2–7 Lines per Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–21

2–8 Framed Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–26

2–9 Screen Alignment Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–27

2–10 Color Set-Up Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–28

2–11 Assign Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–29

2–12 Alternate Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–30

2–13 Deﬁne Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–31

2–14 ASCII Emulation Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2–15 Keyboard Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–36

2–16 Deﬁne Key Editor, Select Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–38

2–17 Communication Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–45

2–18 Communications—Port Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2–19 Communication Transmit Speed Menu . . . . . . . . . . . . . . . . . . . . . . . . 2–48

2–20 Communication Fkey Rate Limit Menu . . . . . . . . . . . . . . . . . . . . . . . . 2–49

2–21 Communication Answerback Dialog Box . . . . . . . . . . . . . . . . . . . . . . . 2–51

2–22 Modem Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–52

2–23 Modem High Speed Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–53

2–24 Printer Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–54

2–25 DEC/ISO Character Sets Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–56

2–26 PC Character Sets Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–57

2–27 Tab Set-Up Dialog Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–59

3–1 Calculator with VT Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3

3–2 Calculator with PC Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

3–3 Clock Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

4–1 7-bit ASCII Code Table with C0 Control Characters Font (Left

Half). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–14

4–2 8-bit ASCII Code Table with C1 Control Characters Font (Right Half)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–15

7–1 Character Cell Sizes for 24-Line by 80- and 132-Column Fonts . . . . . . 7–6

7–2 Character Body Sizes for 24-Line by 80- and 132-Column Fonts . . . . . 7–8

7–3 Example of an Uppercase D (24-Line by 80-Column Font) . . . . . . . . . . 7–10

7–4 Sixel-to-ASCII Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13

8–1 VT Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1

8–2 PC Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1

8–3 Editing Keypad Legends on DEC and PC Layouts. . . . . . . . . . . . . . . . 8–7

8–4 VT Layout - Keystation Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–21

8–5 VT Layout - Typical North American Key Legends . . . . . . . . . . . . . . . 8–22

8–6 Enhanced PC Layout - Map Numbers . . . . . . . . . . . . . . . . . . . . . . . . . 8–22

8–7 Enhanced PC Layout - Typical North American Key Legends . . . . . . . 8–22

9–1 25-Pin Port Pin Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–2

9–2 MMJ Modular Jack Pin Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–3

10–1 Parallel Printer Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–2

13–1 Process of Selecting Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–2

A–1 Austrian/German VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2

A–2 Belgian/French VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–3

A–3 British/U.K./North American VT Keyboard . . . . . . . . . . . . . . . . . . . . . A–4

A–4 Canadian-French VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–5

A–5 Czech VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–6

A–6 Danish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–7

A–7 Dutch VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–8

A–8 Finnish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–9

A–9 Flemish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–10

A–10 Greek VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–11

A–11 Hebrew VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–12

A–12 Hungarian VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–13

A–13 Italian VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–14

A–14 Norwegian VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–15

A–15 Polish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–16

A–16 Portuguese VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–17

A–17 Romanian VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–18

A–18 Russian VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–19

A–19 SCS VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–20

A–20 Slovak VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–21

A–21 Spanish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–22

A–22 Swedish VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–23

A–23 Swiss-French VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–24

A–24 Swiss-German VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–25

A–25 Turkish-F VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–26

A–26 Turkish-Q VT Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–27

B–1 Austrian/German Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . B–3

B–2 Belgian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4

B–3 British/U.K. Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . B–5

B–4 Canadian-English/North American Enhanced PC Keyboard . . . . . . . . B–6

B–5 Canadian-French Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . B–7

B–6 Czech Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–8

B–7 Danish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–9

xxi

B–8 Dutch Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–10

B–9 Finnish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–11

B–10 French Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–12

B–11 Greek Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–13

B–12 Hebrew Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–14

B–13 Hungarian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . B–15

B–14 Italian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–16

B–15 Latin American Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . B–17

B–16 Norwegian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . B–18

B–17 Polish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–19

B–18 Portuguese Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . B–20

B–19 Romanian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . B–21

B–20 Russian Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–22

B–21 SCS Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–23

B–22 Slovak Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–24

B–23 Spanish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–25

B–24 Swedish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–26

B–25 Swiss-French Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . B–27

B–26 Swiss-German Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . B–28

B–27 Turkish Enhanced PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–29

Tables

1–1 VT520/25 Font Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

2–1 Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2–2 Context Sensitive Set-Up Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4

2–3 Display Set-Up Features and Control Functions . . . . . . . . . . . . . . . . . 2–19

2–4 Lines per Page vs. Lines per Screen When Auto Resize is Set . . . . . . 2–20

2–5 Default Graphic Renditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2–6 ASCII Emulation Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2–7 Keyboard Features and Control Functions . . . . . . . . . . . . . . . . . . . . . . 2–36

2–8 Communication and Modem Features and Control Functions . . . . . . . 2–45

2–9 Printer Features and Control Functions . . . . . . . . . . . . . . . . . . . . . . . 2–55

2–10 Set-Up Factory Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–61

3–1 ASCII Emulation Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

4–1 C0 (7-Bit) Control Characters Recognized . . . . . . . . . . . . . . . . . . . . . . 4–2

4–2 C1 (8-Bit) Control Characters Recognized . . . . . . . . . . . . . . . . . . . . . . 4–3

4–3 8-Bit Control Characters and Their 7-Bit Equivalents . . . . . . . . . . . . . 4–4

4–4 Control Character Displayed on Screen . . . . . . . . . . . . . . . . . . . . . . . . 4–11

4–5 VT52 Mode Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–45

5–1 VT52 Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18

5–2 DECDLD Parameter Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–41

5–3 Settings Supported by DECRQM, DECRPM, RM, and SM . . . . . . . . . 5–100

5–4 ANSI Modes for DECRQM, DECRPM, SM, and RM . . . . . . . . . . . . . . 5–109

5–5 DEC Private Modes for DECRQM, DECRPM, SM, and RM. . . . . . . . . 5–110

5–6 Terminal’s Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–150

5–7 Terminal Emulation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–159

xxii

5–8 VT Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–165

5–9 PC Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–166

5–10 VT and PC Keyboard Function Keys Compared . . . . . . . . . . . . . . . . . . 5–167

5–11 Keyboard Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–175

5–12 Mapping Character Sets with Locking Shifts . . . . . . . . . . . . . . . . . . . . 5–187

5–13 Designating a Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–198

5–14 Character Set Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–198

5–15 Visual Character Attribute Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–201

6–1 SCO Console Mode with ASCII Keycodes and Scancodes . . . . . . . . . . . 6–1

6–2 Local Functions on VT and Enhanced PC Layouts . . . . . . . . . . . . . . . 6–2

6–3 SCO Console Mode Function Key Default Codes . . . . . . . . . . . . . . . . . 6–3

6–4 SCO Console Mode Main Keypad Default Codes . . . . . . . . . . . . . . . . . 6–3

6–5 SCO Console Mode Numeric Keypad Default Codes, Num Lock Off. . 6–5 6–6 SCO Console Mode Numeric Keypad Default Codes, Num Lock On . . . 6–5

6–7 SCO Console Mode Editing Keypad Default Codes . . . . . . . . . . . . . . . 6–6

6–8 SCO Console Mode Cursor Keypad Default Codes . . . . . . . . . . . . . . . . 6–6

7–1 Character Cell Sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7

7–2 Guidelines for Designing Soft Characters . . . . . . . . . . . . . . . . . . . . . . 7–8

7–3 Converting Binary Code to an ASCII Character . . . . . . . . . . . . . . . . . 7–11

8–1 Scan Codes for VT Layout in PCTerm Mode . . . . . . . . . . . . . . . . . . . . 8–2

8–2 VT Style Layout vs. Enhanced PC Style Layout Modiﬁer Keys . . . . . . 8–5

8–3 Editing Keypad Sequences for Enhanced PC Layout . . . . . . . . . . . . . . 8–7

8–4 PC Layout Numeric Keypad Sequences - VT Style . . . . . . . . . . . . . . . 8–8

8–5 PC Layout Numeric Keypad Sequences - PC Style, Numeric Mode . . . 8–9

8–6 Local Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–9

8–7 VT Keyboard Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–17

8–8 Enhanced PC Keyboard Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–17

8–9 8-bit Character Set Initialization when Keyboard Language is

Changed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–18

8–10 7-bit Character Set Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–19

8–11 Non-Spacing Accent Marks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–20

8–12 Control Codes and Keystrokes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–28

9–1 EIA Interface Signals and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 9–2

9–2 MMJ Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–3

9–3 Flow Control Threshold Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–13

10–1 Parallel Connector Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–2

11–1 Symbols Used in ASCII Terminal Escape Sequences . . . . . . . . . . . . . . 11–2

11–2 Commands that may Carry Protect Mode Features through Pages . . . 11–4

11–3 Commands that Can Move the Cursor to Protected Area . . . . . . . . . . . 11–5

11–4 Commands that Cannot Move Cursor into Protected Area. . . . . . . . . . 11–5

12–1 Serial Port Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–1

12–2 Terminal Management Control Functions . . . . . . . . . . . . . . . . . . . . . . 12–4

12–3 Keyboard Processing Control Functions . . . . . . . . . . . . . . . . . . . . . . . . 12–5

12–4 Redeﬁnable Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–9

12–5 Screen Processing Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 12–10

12–6 Data Protection Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–20

12–7 Cursor Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–21

xxiii

12–8 ASCII Editing Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–25

12–9 Local Edit Mode Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–25

12–10 Tab Stop Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–26

12–11 Page Edit Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–27

12–12 Rules for Locating Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–29

12–13 Rectangle Area Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–30

12–14 Send Data Delimiters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–32

12–15 Delimiters for Other Personalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–33

12–16 Print/Send Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–33

12–17 Printing Data Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–35

12–18 Graphic Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–36

13–1 Display and Load Character Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–1

13–2 Loading Font Bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–3

13–3 Design a Character Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–5

A–1 VT Keyboard Non-Spacing Diacritical Marks . . . . . . . . . . . . . . . . . . . . A–1

B–1 Enhanced PC Keyboard Non-Spacing Diacritical Marks . . . . . . . . . . . B–1

C–1 WYSE and TVI Modes Function Keys for PC Keyboard . . . . . . . . . . . . C–1

C–2 WYSE and TVI Modes Function Keys for PC Keyboard . . . . . . . . . . . . C–1

C–3 WYSE and TVI Modes Editing Keys for PC Keyboard . . . . . . . . . . . . . C–2

C–4 WYSE and TVI Modes Cursor Keys on PC Keyboard . . . . . . . . . . . . . C–2

C–5 WYSE and TVI Modes Numeric Keys for PC Keyboard, NumLock =

Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–2

C–6 WYSE 160 and TVI Modes Numeric Keys for PC Keyboard, NumLock

= On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–3

C–7 ADDS A2 Function Keys on PC Keyboard . . . . . . . . . . . . . . . . . . . . . . C–3

C–8 ADDS A2 Editing Keys on PC Keyboard . . . . . . . . . . . . . . . . . . . . . . . C–4

C–9 ADDS A2 Cursor Keys on PC Keyboard. . . . . . . . . . . . . . . . . . . . . . . . C–4

C–10 ADDS A2 Mode Numeric Keypad Keys on PC Keyboard; NumLock =

Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–4

C–11 ADDS A2 Mode Numeric Keypad Keys on PC Keyboard; NumLock =

On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–5

C–12 WYSE and TVI Modes Function Keys for DEC VT Keyboard . . . . . . . C–6

C–13 WYSE and TVI Modes Editing Keys on DEC VT Keyboard . . . . . . . . . C–6

C–14 WYSE and TVI Modes Cursor Keys on DEC VT Keyboard . . . . . . . . . C–7

C–15 WYSE and TVI Modes Numeric Keypad PF Keys on DEC VT

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–7

C–16 ADDS A2 Function Keys on DEC VT Keyboard . . . . . . . . . . . . . . . . . . C–7

C–17 ADDS A2 Editing Keys on DEC VT Keyboard . . . . . . . . . . . . . . . . . . . C–8

C–18 ADDS A2 Cursor Keys on DEC VT Keyboard . . . . . . . . . . . . . . . . . . . C–8

C–19 ADDS A2 Numeric Keypad PFKeys on DEC VT Keyboard . . . . . . . . . C–8

C–20 Local Functions in ASCII Code Mode . . . . . . . . . . . . . . . . . . . . . . . . . . C–9

C–21 Local Functions in PC Scancode Mode . . . . . . . . . . . . . . . . . . . . . . . . . C–11

E–1 ANSI Control Functions Index by Final Character . . . . . . . . . . . . . . . E–1

xxiv

VT520 Video Terminal

This part includes the following chapters:

• Chapter 1, Overview

• Chapter 2, Set-Up

• Chapter 3, Desktop Features

PartI

1.1 Introduction

The VT520 is a low-cost, multi-session, text video terminal featuring enhanced keyboard and communications ﬂexibility, providing up to four sessions at a time. Two or more sessions can be assigned to the same communication port when Terminal Device/Session Management Protocol (TD/SMP) is used to multiplex the sessions. Each session has its own framed window, window title, and icon name.

The VT520 has a deﬁne key editor that allows you to reprogram any key on the keyboard.

The VT525 color terminal allows you to assign different colors to the various windows and to combinations of character attributes. You can select colors from color look-up tables or create your own color combinations. Unless speciﬁcally mentioned in this manual the term VT520 also refers to the VT525 color model.

The product has a 25-pin stacked male/female RS-232 connector (EIA-232), two 6-pin EIA-423 (MMJ) connectors, and a Centronics parallel connector. The RS-232 and the EIA-423 ports are used.

The VT520 also has power management features that exceed the Environmental Protection Agency (EPA) Energy Star requirements for saving energy.

Overview

1.2 Communications Features

The terminal provides:

• Three bidirectional, asynchronous serial communication ports; one of which (Comm 3) can be used for a local printer.

• Baud rates from 300 to 115.2K baud

• Centronics parallel printer port

• 25-pin serial connectors

• Two MMJ serial connectors

• Expanded ﬂow control options:

- Software ﬂow control using XON/XOFF or XPC

- Hardware ﬂow control using DTR/DSR

Overview 1–1

Overview

1.3 Keyboard Features

The VT520 offers a choice of two keyboard layouts—a VT keyboard layout (LK411) or an enhanced PC keyboard layout (PCXAL). The VT keyboard (Figure 1–1) and the PC keyboard (Figure 1–2) differ in the placement of some of the keys, like the Control key. A VT keyboard has 20 function keys,F1through main keypad, while a PC keyboard has 12 function keys,F1through

Figure 1–1 Sample VT Keyboard Layout

North American/United Kingdom (Word Processing Version)

F2 F3

F20

, above the

F12

F8 F9

F10

F13

F11

F12

Help

F14

F17

F19

F20

F18

(ESC)

1 2 3 4 5 6 7 8 9 0

Tab

Ctrl

Shift

A S D F G H J K L

> <

Compose Character

$ %

Z X C V B N

Alt

Function

( )

Alt Function

}

]

;

’

Shift

Compose Character

I O PT Y UW E R

Figure 1–2 Sample PC Keyboard Layout

I O PT Y UW E R

North American

F8 F9 F10

( )

: ;

F11 F12

BackSpace

}

]

Enter

" ’

Shift

Altl

d i i

t a l

Esc

1 2 3 4 5 6 7 8 9 0

Tab

Caps Lock

Shift

Ctrl Ctrl

$ %

F4 F5 F6 F7

A S D F G H J K L

Z X C V B N

Alt

Return

Find

Select

Scroll

Screen

Lock

SetUp Break

EndDelete

Pause

PageUpHomeInsert

Page Down

Insert Here

Prev Next

PF1 PF2 PF3

Remove

7 8 9

Caps Lock

Num Lock

Num

Lock

7 8 9

Home PgUp

PgDn

End

Ins Del

GSF-MK2510-29-DG

321

MA-1520a-92.PS

Scroll Lock

Enter

PF4

Enter

1–2 Overview

LJ-00226a-TI0.PS

The keyboard has the following features:

• An IBM PS/2-compatible 6-pin mini DIN connector.

• Keyboard keys that can be reprogrammed to send single characters, to send character sequences, or to invoke local functions (Hold, Copy and Paste, Remove, Insert, Print Page, Toggle Autoprint, Set-Up, Break, and so on).

• A local user-deﬁned key editor. Key deﬁnitions can be saved in nonvolatile memory.

• Eight levels of user-deﬁned function keys using any combination of Shift, Control, and Alt.

• 971 bytes of nonvolatile memory available for custom user-deﬁned keys (UDKs)/Session, which cannot be reallocated. The maximum length for a UDK deﬁnition is 255 bytes.

1.4 Printer Port Features

The terminal has the following printer port features:

• A Centronics parallel printer port.

Overview

1.3 Keyboard Features

• IBM ProPrinter support.

• Bidirectional serial communication ports.

• Baud rates from 300 to 115.2K baud.

• Null characters that can pass as data to the printer port.

1.5 Display and Text Capabilities

The terminal has both ANSI and ASCII display and text processing capabilities. The features of each are listed below.

1.5.1 ANSI

• Macro capability

• Display: 26, 42, or 53 data lines

• Selectable page size: 24, 25, 36, 42, 48, 50, or 72 lines

• Full status line (occupies one data line)

• Separate keyboard indicator line

• Three pages of 24 lines

• SCO Console mode

1.5.2 ASCII

• Terminal emulations: WYSE: 325 (color model only), 50, 50+, 60 native, 160 text only, 120, 150, PCTerm Televideo: TVI 950, 925, 910+ Applied Digital Data Systems: ADDS A2

• Dim and invisible character attributes

Overview 1–3

Overview

1.6 Enhanced Set-Up

The terminal provides an enhanced menu-based Set-Up, allowing common features to be accessed easily from a single screen. All Set-Up features are host controllable to allow remote conﬁguration. The terminal also has a means to lock out the local setup key.

Set-Up menus are available in English, French, German, Italian, or Spanish. For details, see Chapter 2, Set-Up.

1.7 Desktop Productivity Features

The terminal has the following desktop productivity features:

• Local copy and paste (not available in PCTerm mode)

• Time of day clock (host or locally set, no battery back up)

• Desktop calculator with decimal, octal, and hex conversions

• Display character set tables.

• Review previous data lines.

For details, see Chapter 3, Desktop Features.

1.8 Character Set Support

In addition to the traditional Digital graphic character sets (DEC Multinational, NRCS, and so on), the VT520 supports Cyrillic, Greek, Hebrew, Turkish, most Eastern European languages, and PC character sets. For details, see Chapter 7, Character Sets.

1.9 Ergonomics (Human Factors) Features

The terminal is designed to provide a high-quality human interface and longterm reliability at low cost. The VT520 offers 72 Hz refresh, full overscan. The terminal has the following features:

• 35.5 cm (14 in) ﬂat face, antiglare CRT screen

• Improved resolution of 802 432 with overscan.)

• 72 Hz refresh

• Overscan

• Additional fonts (see Table 1–1)

• Tilt/swivel base

• Choice of keyboards

• Accessibility aids

480 pixels. (The mono VT520 also has 800

Not available in color model.

1–4 Overview

Table 1–1 VT520/25 Font Sizes

80 Columns 132 Columns Maximum Number of Lines

10216 6216 26 lines + keyboard indicator line 10210 6210 42 lines + keyboard indicator line 10

8 628 53 lines + keyboard indicator line

1.10 Field-Upgradable Firmware

All VT520 models include support for a 4 Mbit (512 KByte) ROM cartridge option. The base unit comes with a factory-installed ROM. The ROM cartridge connector is protected by a ROM cartridge cover. To install new code, the ROM cartridge cover is removed, and a ROM cartridge with attached cover is plugged into the ROM connector. The new code completely supersedes the factory-installed ROM code. It does not overlay or extend the factory code.

If you service the terminal with a ROM cartridge installed, turn the power Off, and remove and save the ROM cartridge to put it on the new terminal.

Overview

1.9 Ergonomics (Human Factors) Features

Note

To install a ROM cartridge with new ﬁrmware, use the following steps:

1. Turn the power off before installing the ROM cartridge.

2. Turn the power on and press

3. Select Actions.Restore factory defaults and press

4. Select Sessions.Save all sessions and press

Return

The installation is now complete. When you power-on the terminal, the message ‘‘ROM card active’’ is displayed in the upper-left corner of the display. Note that steps 3 and 4 are necessary to initialize the terminal’s non-volatile memory for use with the ROM cartridge ﬁrmware. Failure to perform these steps may cause the terminal to report an NVR error.

Overview 1–5

Overview

1.11 Comparison with previous VT Terminals

The VT520 is functionally compatible with other ANSI products with the following exceptions:

• Terminal ID The Primary Device Attributes can report additional extensions to cover

new features. See Chapter 4 for a summary of the control functions. The Secondary Device Attributes are different.

VT520 CSI > 64 ; Pv ; 0 c VT525 CSI > 65 ; Pv ; 0 c

Where Pv is the ﬁrmware version number.

• Dynamically Redeﬁnable Character Set (DRCS) Fonts The VT520 has four buffers, which can load up to two dynamically redeﬁnable

character sets, each with an 80-column font and a 132-column font.

• Keyboards VT420 keyboards cannot be used on the VT520; however, the VT520 can

emulate the VT420 keyboard behavior when conﬁgured accordingly.

• Four Sessions The VT520 is a multi-session terminal. You can have up to four

sessions enabled. More than one session can be established on the same communication port.

• PC Character Sets PC character sets are available in PC Term and SCO Console mode only.

1–6 Overview

This chapter describes VT520 Set-Up features. Set-Up is used to examine or

Enter,Return,Do

, or

Select

invokes the action or

setting for the current menu item. The Set-Up function may be reassigned to other key combinations or can be

disabled it for local entry into Set-Up. When you pressF3as the ﬁrst key after the terminal is powered on, you always enter Set-Up, regardless of which keyboard you use or howF3is deﬁned.

Set-Up 2–1

change terminal operating features, such as transmit/receive speeds, type of cursor, or key deﬁnitions.

2.1 Entering Set-Up

You enter Set-Up by pressing the key designated as the Set-Up key. Pressing this key alternately places the terminal in Set-Up mode or returns it to the operating mode.

On a . . . The Set-Up key is . . .

Set-Up

VT keyboard

SCO Console mode

PC keyboard

Figure 2–1 Set-Up

MA049193.GRA

The Set-Up display consists of pull-right menus. You can move back and forth with the arrow keys. Pressing

on the top row.

Caps Lock F3 Caps Lock Print Screen

Alt Print Screen

Set-Up



) in lists and in

boldface in text.

2–2 Set-Up

2.1 Entering Set-Up

2.1.1 Effects of Entering Set-Up

Placing the terminal in Set-Up mode causes no loss of data if a Flow Control protocol is in use on the communications port. The ﬁrst Set-Up menu is displayed on the screen. Upon exiting Set-Up, the previous text is restored.

Entering Set-Up has the following side effects:

• Any compose sequence in progress is aborted and the keyboard is unlocked.

• A Set-Up Summary Line is displayed.

• Press

• Printer operations are suspended and are resumed upon exiting Set-Up.

Shift

2.1.2 Set-Up Languages

The VT520 Set-Up menus can be displayed in ﬁve languages using a Set-Up feature. A menu allows you to choose the language in which all subsequent Set-Up menus and displays are written. Selections from this Set-Up language menu (Figure 2–2) take effect immediately. This feature can also be invoked by DECSSL.

Figure 2–2 Set-Up Language Selection

to show the Indicator Status Line.

2.1.3 Power-On Settings and Defaults

The VT520 terminal stores many of its feature settings in nonvolatile memory (NVM). Nonvolatile memory retains these settings even when power is shut off. In addition to storing operator-selected features, the terminal retains the factory default settings in permanent memory. By using Set-Up, you can modify individual terminal features, recall the feature settings stored in nonvolatile memory, or recall the factory default settings.

In this chapter, the defaults are shown with a solid bullet (

2.1.4 Self-test Error Messages

At power-up, the VT520 terminal executes a series of self-tests, displays a message indicating whether the self-tests were successful, and displays a banner message. (To change the banner message, see Section 2.4.6.)

If the self-tests detect an error, one of the following messages is displayed on the terminal in place of "Selftest OK."

Table 2–1 Error Messages

Message Meaning

Set-Up

2.1 Entering Set-Up

NVR Error - 1 A ﬁrmware update, or loss of power while

RS-232 Port Data Error - 2 Communications problem inside terminal.

RS-232 Port Controls Error - 3 Communications problem inside terminal.

DEC-423 Port Error - 5 Communications problem inside terminal.

Parallel Port Error - 6 Communications problem inside terminal.

ROM Cartridge Error - 7 Turn the terminal off, and make sure the ROM

Keyboard Error - 8 Turn the terminal off, and make sure the

writing to the NVR during a Save settings process may cause this error. Try Actions

Recall factory defaults followed by Session Save settings for all .

Call for service.

cartridge is seated ﬁrmly on its connector pins. Turn the terminal on. If the problem continues, try another ROM cartridge. If the new ROM cartridge does not work, the problem is inside the terminal; in which case, call for service.

keyboard cable is plugged in. Turn the terminal on. If the problem continues, try another keyboard. If the new keyboard does not work, the problem is inside the terminal; in which case, call for service.

2.1.5 Context Sensitivity

On the screen, a check box=or radio button () indicates the current user selection and normally reﬂects the operating state of the terminal.

Certain feature selections overlap and could contradict each other, so they cannot be active at the same time. These are called context sensitive features, which are displayed with the dim video attribute in Set-Up. Example:

You cannot select Comm3 as a printer port if it is selected as a communications port.

Table 2–2 lists the set-up features that are context sensitive.

Set-Up 2–3

Set-Up

2.1 Entering Set-Up

Table 2–2 Context Sensitive Set-Up Features

Menu Item Dimmed when . . .

Session

Display

Color

Terminal type

ASCII emulation

Keyboard

Communication

Modem

Printer

Pages per session Page memory allocation

Lines per screen Lines per page

Cursor direction Keyboard language is not Hebrew. Energy saver CRT saver = never is selected. Overscan Terminal is a color terminal. ASCII color mode, Reverse

and blank attributes, and Intensity attributes

Alternate text colors... Select color mode is other than Alternate color. Select color mode Terminal type

Terminal ID to host Terminal type.Emulation mode is other than a

7-bit NRCS characters Emulation mode is set to VT100/VT52; or

TVI page-ﬂip Terminal type

Key encoding Character, Scan code and Key position

Data processing keys A PC keyboard is connected. Map PC keyboard to VT The keyboard is not a PC keyboard.

Port select Comm3 Comm3 is selected as a communications port. (It

Half duplex The host Communication

Transmit ﬂow control DSR and Both

Receive ﬂow control DTR and Both

Disconnect delay and Modem speed

Serial print speed, 2-way communication, Transmit ﬂow control, Receive ﬂow control, Word size, Parity, and Stop bits

DEC/ISO char sets IBM ProPrinter is selected. PC character sets DEC ANSI printer is selected. Print mode

Controller Display.Show control characters is selected.

Page selection exceed the number of unassigned pages available.

Sizes are not available based on the current page memory allocation. WYSE is selected; use ASCII emulation

lines and Pages.

Emulation mode is set to other than an ASCII

terminal emulation.

VT or SCO console.

Communication

8-bit NRC set exists for the keyboard language. Terminal type.Emulation mode is set to VT or

SCO console.

TVI. ASCII emulation is selected, or a PC keyboard is

connected.

can be either a comm port or a printer port but not both.)

S1=comm2.

The Modem

The Modem.Enable modem control is not selected.

The Communication the Print = parallel selections.

Emulation mode is other than a

Word size is 7-bits; or no

Emulation mode is other than

Port select is set to

Enable modem control is selected.

Port select is set to one of

Data

2–4 Set-Up

2.1.6 Set-Up Summary Line

Item Information Displayed Communication Feature

S1=comm1 Port selected: comm1, comm2, or comm3

9600 Transmit speed: 9600 baud N Parity: N=none, E=even, O=odd, M=mark,

S=space 8 Word size: 7 or 8 bits 1 Stop bits: 1 or 2 bits

ISO Latin-1 Default character set or

PC set in PCTerm mode

North American Keyboard language

VT520 Emulation mode

V2.1 Firmware version

The summary line is visible whenever the terminal is in Set-Up, except under the following conditions:

• You press a

Shift

key. Pressing either

Shift

key causes the normal Indicator

Status Line to replace the Set-Up Summary Line.

• The Set-Up Summary line is temporarily replaced by an error or status message from the terminal. In this case, the error or status message is shown in place of the Set-Up Summary line until you type another key.

The Set-Up Summary Line appears in the currently selected set-up language.

2.1.7 Set-Up Status Messages

The Status or Set-Up Summary line is sometimes replaced by a Set-Up status message until the next user keystroke. Set-Up status messages are displayed whenever the effect of a set-up action would not otherwise be apparent. Example: "Done" is displayed after the Reset terminal action has completed.

The following are set-up status messages:

• Done

• NVR Error

• Incompatible settings not restored - check pages per session and lines per page

Set-Up 2–5

The Set-Up Summary Line (Figure 2–3) shows the important set-up features that affect whether the terminal can successfully communicate with the host. If the terminal is not working, the Set-Up Summary Line allows you to quickly verify if the communication features are set appropriately. The summary line is displayed below the last data line, where the status line would normally appear.

Figure 2–3 Set-Up Summary Line

The Set-Up Summary Line contains the following set-up information extracted from the Set-Up displays.

Set-Up

2.1 Entering Set-Up

Set-Up

2.1 Entering Set-Up

• Incompatible settings not restored - check comm port selection

• Page memory reallocated

• Sessions not enabled - No Session Management response from host

• Session # terminated abnormally

• Insufﬁcient terminal resources to open Session

• Sessions not enabled - Unable to run with host Session Management version

• Session open request pending

• Session opened

• No response from host for Session Management

• Data overrun occurred on Session #

• Sessions not enabled - Sessions not selected

• Session # terminated normally

• Insufﬁcient host resources to open Session

• Sessions disabled

• Sessions enabled - Restoring previous sessions

Set-Up functions that require additional time to process display the message ‘‘Please wait’’ until they have completed. Save settings for all and Restore settings for all display this message.

2.1.8 Status Line

The VT520 terminal has a status display with the following features:

• The clock time appears on the status display if the local clock has been initialized since the terminal was last powered on.

• In the ASCII emulation modes, the host-writable status line becomes the WYSE Editing status line.

• When enabled, the Accessibility Aids feature ("sticky keys") displays icons in the Keyboard Indicator line. For details, see Section 8.11.2.

The VT520 Indicator status line includes the Active Position Indicator, Printer Status Indicator, Modem Status Indicator, and local clock time in the desired format. Example:

1(24,008) Printer: None Modem: DSR 3:15 PM

2.1.9 Keyboard Indicator Line

The Keyboard Indicator Line has the following features:

• It is displayed in the Set-Up language.

• It has active keyboard layout. Nothing is displayed for Group 1. "G2" is displayed for Group 2, along with a small icon representing the right side of the top of the keycap. (To see this icon, press 2, press

• For Greek, Hebrew, and Russian, "G2" is replaced by "Grk", "Heb", and "Rus", respectively.

2–6 Set-Up

Ctrl/Alt/F1

Ctrl/Alt/F2

. To return from Group

• Visible bell—This feature ﬂashes a bell ringing font whenever a sound is

moves the cursor to the next item in the main menu. Pressing

)

moves the cursor right to the ﬁrst item of the submenu, making it the active menu.

Set-Up 2–7

generated.

• When the Num Lock state is active on an EPC keyboard, "Num Lock" is displayed.

• When an EPC keyboard is operating in VT style, "VT" is displayed in place of the Num Lock indicator.

• In French and Spanish, an icon replaces the word "Lock" on the indicator line.

Example:

Heb Num Lock Copy Hold Lock Compose Wait

2.2 Set-Up Screen Text

The main menu, shown in Figure 2–4, is the ﬁrst menu displayed whenever you enter Set-Up. As the ﬁrst menu, it holds the main directory of Set-Up features and those features which are commonly accessed and must be easy to ﬁnd at all times. The Actions submenu is also displayed, since the Actions menu item is currently selected.

Unless stated otherwise, the following general descriptions apply:

Set-Up

2.1 Entering Set-Up

• Changes to feature settings do not take effect until you exit Set-Up. Only net changes have an effect—a change to a new value and back to an old value has no effect.

• The setting choices for some features are shown in the corresponding Set-Up displays. Where all the choices could not be displayed, additional choices are listed immediately under the ﬁgure.

Figure 2–4 Main and Terminal Actions Menu

MA049193.GRA

Pressing

Set-Up

2.3 Main Menu

The following descriptions refer to Figure 2–4. The items above the dividing line in the main menu form a directory to the major

functional areas of set-up features. Each item has a corresponding submenu or dialog box.

Pressing the Set-Up key from within a dialog box will ﬂash the OK button as if it were pressed and accept the corresponding changes before exiting Set-Up.

Below the dividing line are features that need to be easy to ﬁnd from any menu.

2.3.1 On-Line

The On-line feature allows you to select whether the terminal directs keyboard input to its host port UART to communicate with a remote host (On-Line), or directs keyboard input directly to the screen (receive character parser) without sending to a remote host (off-line or local).

The On-line selection is different from the Local echo mode in the Communications Set-Up submenu. When On-line is disabled (local mode), nothing is sent to the host. Any keyboard input is directed to the receive character parser, which updates the screen.

In contrast, Local echo causes characters sent to the host port to also be directed back to the receive character parser, as if they had been received (echoed) from the host. Local echo is temporarily disabled when the terminal is in either Local mode or Local Controller mode, because keyboard input is already being redirected to the screen or printer port.

If an NVR error occurs during power-up, the terminal switches to Local mode.

Note

2–8 Set-Up

Terminal reports, such as Answerback, DA, CPR, DECTSR, DECRPM, DECRPSS, DECAUPSS, DECCIR, DECTABSR and DSR, are not directed to the display. While in "local", host communications are put on "hold": All data received is buffered. If necessary, an XOFF is sent (or DTR is deasserted) to prevent buffer overﬂow. This buffered data is directed to the display when On-line mode is reentered. Note that the received character buffer (silo) is responsible for sending XON and XOFF when needed, not the On-line/Local state.

When in Local mode, modem signals, including DTR, are unaffected. No disconnect is performed. The functions of the printer port remain unchanged in Local mode. They function the same as in On-line mode.

When in Local mode and Printer To Host mode is selected, data from the printer port is displayed on the video terminal.

When both Local mode and Printer Controller mode are selected, the terminal is in Local Controller mode. Keyboard characters are sent to the printer port. Note that in "regular local" mode, any keyboard output is directed to the screen, but in "regular controller" mode, the keyboard output is directed at the host port. When Local Controller mode is exited to Local mode, the terminal redirects keyboard output from the printer to the screen (and parser). When you change from Local Controller mode to Printer Controller mode, the terminal transmits the characters accumulated in the receive silo to the printer.

2.3.2 Save Settings

The Save settings menu item, when invoked by pressing causes the settings for most Set-Up controlled operating features to be saved in nonvolatile memory, where they become the power-on settings.

The following settings are not saved.

• Keyboard encoding mode

• Application cursor keys when set by a host control function.

• Application keypad mode when set by a host control function.

2.3.3 Restore Settings

Restore settings is an action ﬁeld that is used to replace all saved Set-Up parameters with the values stored in the NVR. As a side effect, this feature performs a disconnect sequence, clears the screen, reinitializes the user-deﬁnable keys (as saved), clears the soft character set, returns the cursor to the upper left corner, aborts any print operation in progress, aborts ESC, CSI, and DCS sequences (and control strings), and shows "Done" on the status line. This action can also be invoked by the RIS control function.

2.3.4 Exit Set-Up

The Exit Set-Up menu item, when invoked by pressing to exit Set-Up. The effect is identical to pressing the Set-Up key while in Set-Up.

2.3 Main Menu

Return

Enter

, causes the terminal

Enter

Set-Up

2.4 Actions Menu

The following descriptions refer to Figure 2–4. Certain Set-Up features instruct the terminal to perform an immediate action when they are invoked. These features are grouped in the terminal Actions menu.

2.4.1 Clear Display

The Clear display feature clears the active page (including the lines which have temporarily disappeared while the you are in Set-Up).

2.4.2 Clear Communications

This feature is used to clear communication buffers and ﬂags. It does not affect the On-Line/Local state. It is not invoked by any control functions.

Clear communications:

• Aborts any print operation in progress

• Aborts any escape sequence, control sequence, control string, or character string processing (ESC, CSI, DCS, APC, OSC, PM, SOS)

• Clears the keyboard buffers

• Clears the receive silo

• Clears the transmit silo

• Takes the terminal out of Printer Controller mode

• Sends XON on to the host port

• Sends XON to the printer port if Printer To Host and XOFF are enabled

Set-Up 2–9

Set-Up

2.4 Actions Menu

• Resets XOFF received ﬂags on both ports

• Does not clear the screen

• Clears KAM locked condition

• Clears the "printer port has seen DSR since power up" ﬂag. When in Set-Up,

Ctrl Enter

disables sessions and clears TD/SMP.

2.4.3 Reset this Session

The Reset this session menu selection only resets the active session.

To . . . Press . . .

Reset all four sessions, Perform a power-up reset,

The Reset this session Set-Up feature resets the terminal to a "known state." This function is like Soft Terminal Reset (DECSTR), except DECSTR resets the Character Set mode to "8-bit Characters" and Reset terminal does not.

Additions:

• Keyboard encoding is reset to "character."

• PCTerm mode is not selected.

From Set-Up, a soft reset using Reset terminal always works regardless of the terminal mode; but using mode changing control functions (DECSCL, S8C1T, S7C1T, DECANM), the soft reset is sometimes not performed.

2.4.4 Restore Factory Defaults

The Restore factory defaults menu selection restores the factory default settings for all four sessions. There is no provision to restore factory defaults to a single session. Restore settings on the main menu only restores the active session’s settings from NVM.

Control Control Set-Up

Reset this session.

Note

from within Set-Up.

As a side effect, Restore factory defaults does the following:

• Performs a disconnect sequence

• Clears the screen

• Reinitializes the user-deﬁnable keys

• Clears the soft font

• Returns the cursor to upper-left corner

• Aborts print operations in progress

• Aborts ESC, CSI and DCS sequences

• Displays the "Done" message on the status line

2–10 Set-Up

2.4.5 Clock, Calculator, Show Character Sets

The Clock, Calculator, and Show character sets menu items are used to invoke the corresponding desktop productivity features. Refer to Chapter 3.

2.4.6 Banner Message

The Banner message menu item invokes a dialog box with a 30-character limit. When this feature is selected, a dialog box is displayed with a reverse video text entry area 30 characters long. If a Banner message is currently deﬁned, the message is displayed in the text entry area. The used to delete backwards and enter a new Banner message.

All characters that can be generated by the keyboard are legal in this ﬁeld (including primary and secondary keyboard language characters). As such, no errors are reported, except when trying to enter more than 30 characters. In this case, the bell rings (if enabled), and no more characters are accepted. The factory default message is no message at all (a blank ﬁeld).

From the Actions menu, select Banner message....

Set-Up

2.4 Actions Menu

Delete

key can then be

1. Press

Return

2. Enter your banner message.

3. Press the

4. Press

Return

5. Use the Save settings menu item to save the Banner message.

2.5 Multiple Sessions

Multiple sessions extends the VT520 to act like four terminals in one. A session is an active connection between the terminal and a host system. The Session Set-Up menu controls the use of more than one session. See Figure 2–18.

The VT520 supports up to four sessions using virtual terminals. Each virtual terminal maintains the full keyboard and display state of a real physical terminal but shares a single keyboard and display with other virtual terminals. Before you can login using a virtual terminal, it must be connected to a host computer.

VT520 session virtual terminals can be connected directly to a host computer through any of the three serial communication ports on the back of the terminal. Since there are only three comm ports, this method alone can only support three sessions.

To use a fourth session or reduce the number of serial comm lines needed, more than one session must be connected through a single comm port. The VT520 allows this using a session management protocol, called TD/SMP (Terminal Device/Session Management Protocol). TD/SMP allows two or more sessions to share a single comm line, as long as the other end of the comm line supports the protocol. To enable TD/SMP at the terminal, you simply assign more than one session virtual terminal to the same comm port in Set-Up.

to select

Enter

to display a dialog box.

button.

Enter

to return to the Set-Up menu.

TD/SMP is standard on most terminal servers. If you are using a terminal server, check with its documentation to determine if it can run TD/SMP.

Set-Up 2–11

Set-Up

2.5 Multiple Sessions

2.5.1 Enabling and Controlling the Session Conﬁguration

The VT520 provides three serial communication ports which may be assigned to session virtual terminals in any combination. When only one virtual terminal is assigned to a communications port, the terminal functions as a single session terminal. The other three session selections are dimmed. The single session may be allocated 8 pages of 25 lines each by 80 or 132 columns. The color terminal supports 9 pages.

As session virtual terminals are assigned to physical communication ports, the terminal’s ﬁrmware allocates the necessary structures to create the virtual terminals up to a maximum of four. When more than one virtual terminal is assigned to a single communication port, the Terminal Device/Session Management Protocol (TD/SMP) is used.

2.5.2 Multiple Sessions using a Terminal Server with TD/SMP

Procedure:

1. At the

Local> set port multi enable

Local>

prompt, enter the following command:

Return

2. Continue with your login procedure.

To permanently set a terminal server port to use TD/SMP, you would type:

Local> define port multi enable

Return

2.5.3 Multiple Sessions using SSU Host Software

If your VT520 is connected directly to a host computer without a terminal server, use can still use TD/SMP by running the Session Support Utility (SSU) on your host computer. On a system that has SSU software, such as OSF or OpenVMS, open the ﬁrst session as follows:

$ mcr ssu

Return

On an UNIX-style system, open the ﬁrst using:

% ssu

2.5.4 Opening Another Session

Once TD/SMP is enabled, you can open a new session and switch between them as follows:

1. Press theF4(Session) key on a VT keyboard; or press numeric keypad on a PC keyboard.

F4 is used as the Session key on the VT keyboard (factory default). For consistency,

On Enhanced PC layout keyboards (PC style),

Caps Lock Scroll Lock

or substituted for the VT Session key (F4) anywhere it is used.

Caps Lock F4

also works on the VT keyboard.

are used as the Session keystroke and may be

Caps Lock 0

Caps Lock F4

on the

2. To go directly to a particular session, press numeric keypad.

The currently selected session is indicated on the Set-Up Summary line along with its corresponding communications port assignment (S1=comm1 for example).

2–12 Set-Up

Caps Lock 1,2,3

or4on the

2.5.5 Restoring an Interrupted Session

When a session is interrupted, the VT520 or the host system may lose the context of the current session. After the terminal and system regain communication, you can restore the context of the interrupted session without canceling the session and starting over again.

Set-Up

2.5 Multiple Sessions

To restore a session, press theF4key; or press keypad. Or you can enter Set-Up Communications.Port Select and assign the session to a comm port.

2.5.6 Session Management

Assigning more than one session virtual terminal to a single comm port automatically allows session management.

Reducing the number of session virtual terminals assigned to a single comm port from two to one automatically disables session management if it was enabled.

When Display for each session up to 30 characters for the window title. The ﬁrst 12 characters become the default icon name, which you can change in Set-Up.

2.6 Session Menu

The Session Set-Up (Figure 2–5) controls the use of the more than one session.

Figure 2–5 Session Menu

Caps Lock 0

Framed windows is selected in Set-Up, you can assign a name

on the numeric

On a VT keyboard,F4is used as the Session key (factory default). On a PC keyboard, substituted in this text for VT Session key (F4) anywhere it is used. For consistency,

CapsLock 0

kpd is used as the Session keystroke and may be

kpd also works on the VT keyboard.

Set-Up 2–13

Set-Up

2.6 Session Menu

2.6.1 Select Session

The Select session submenu is used to select the active session. All SetUp selections apply to the currently active session. Most settings are kept independently for each session and may be saved in non-volatile memory. Exceptions are made for settings that control the physical hardware that is shared between sessions. Example:

A single communications port cannot be used for both a session connection and a printer port simultaneously.

The terminal ensures that conﬂicts like this do not happen by disabling (displaying as dim) or resetting certain selections. All such exceptions are noted explicitly.

A disabled session has its session selection dimmed but can still be conﬁgured in Set-Up if it was active when Set-Up was entered. At least one session is always enabled. If the currently active session is disabled, the previous enabled session becomes the active session when you exit Set-Up.

While the terminal is in Set-Up, the Session key can be used to cycle between sessions in order. You can also use select enabled sessions explicitly. The currently selected session is indicated on the Set-Up Summary line along with its corresponding communications port assignment (S1=comm1 for example).

CapsLock 1

kpd through

CapsLock 4

kpd to

Selecting a different session within Set-Up does not affect the active session at the host until you exit Set-Up.

2.6.2 Session Name

The Enter session name dialog box allows a 30 character descriptive name to be entered for the active session. Depending on the windowing option selected, this name is displayed with the corresponding session window to help you identify each session. See also Section 2.8.19.

Entering a session name is similar to entering an answerback message. A session name is not saved automatically; you must use the Save settings menu item.

Icon name — The ﬁrst 12 characters of the session name is used as the icon name, but this name may be overwritten if a separate icon name is speciﬁed by a host control function. The session name is included as the "application_ parameter" in the TD/SMP OPEN_SESSION command and may be used to select a desired service.

2.6.3 Pages per Session

The Pages per session dialog box displays a Session Page Memory Allocation screen (Figure 2–6), which allows you to control how the terminal’s page memory is allocated among the enabled sessions. The VT520 provides 8 pages of 25 lines by 80 or 132 columns as standard (9 pages on the color terminal). A disabled session (Comm = session off) is dimmed and does not use any page memory.

Page selections which are not available in the current conﬁguration are dimmed and cannot be selected. Thus, you may have to decrease the number of pages assigned to one session before you can increase the number of pages assigned to another. Any data on these pages is erased.

2–14 Set-Up

Figure 2–6 Session Page Memory Allocation

Set-Up

2.6 Session Menu

The ‘‘__pages’’ selections in Figure 2–6 allow you to enter a number of pages not shown as one of the other choices. The number in parenthesis below these selections is maximum number of pages available to each session. When you select this radio button, this maximum number is used as the number of pages for this session unless you enter a new value. Pressing Enter selects the radio button and maximum number of pages in a single operation. Alternatively, any number up to the maximum number of pages available can be typed in directly.

The maximum number of pages available to each session change as the allocation to other sessions changes. If only one session is enabled, the maximum number of pages in a standard VT520 is 8.

A session that is currently disabled (Comm = session off) is dimmed and shows Max pages as zero to remind you that it is not using any page memory. (Zero is the factory default for S3 and S4.) A disabled session can be re-enabled at any time by assigning it to a communications port. When a disabled session is re-enabled, its initial page memory allocation is the previous allocation for that session if available from the free resource pool; otherwise, it is one page of 25 lines. If all pages are currently assigned, the terminal reduces by one the allocation to the highest numbered session with more than one page. This automatic adjustment of page allocation ensures that you can always enable another session without worrying about memory management. If a session requires a ﬁxed number of pages for compatibility, you can assign that number to S1 and S2. We recommend that you allocate page memory for the number of sessions to be used ahead of time to avoid losing data in an existing session when creating a new one.

Set-Up 2–15

Set-Up

2.6 Session Menu

In case you cause the terminal to re-assign page memory while sessions are in use, the pages assigned to a new session is ﬁrst erased. If the cursor was on that page, it goes to page one. The terminal issues a warning message to indicate what may have changed for you to check, such as:

"Page memory reallocated, check pages per session and lines per page."

"Incompatible settings not restored, check pages per session and lines per page."

The terminal created a new session forcing page memory to be re-allocated.

The terminal is unable to copy or restore a requested setting.

2.6.4 Soft Character Sets/Session

The Soft char sets/session submenu allows you to specify the allocation of DRCS character set buffers to multiple sessions on the VT520 mono terminal only.

• Two each S1 and S2 allocates two character set buffers each to S1 and S2 making S1 and S2 compatible with terminals, like the VT510, VGB10, or WS510 video terminals. In this case, S3 and S4 do not support the DRCS extension, which is reported in their primary device attributes response.

• One each gives each session a single DRCS character set buffer making each session compatible with terminals, like the VT420.

This submenu is not included in the color terminal since it has enough memory to give all four sessions Two each.

2.6.5 Save Settings for All and Restore Settings for All

The Save settings for all and Restore settings for all menu items are like the Save settings and Restore settings items in the main menu except that they operate on all four sessions at once.

Since restoring settings for four sessions can take some time, the screen is cleared and a "Please wait" message is displayed in the center of the screen for one second to begin the restore operation. A "Done" or "Incompatible setting not restored" message is displayed upon completion.

When restoring settings saved in non-volatile memory, it is possible that the number of pages saved for a session is larger than the number of pages available in the free resource pool. In this case, the same approach is used as when a session is newly enabled. The process can be summarized as follows:

1. When restoring settings for more than one session, settings for each session are restored in order (S1, S2, S3, S4).

2. The saved page memory allocation is restored if that number of pages is available from the free resource pool, otherwise the page memory allocation is set to one page of 25 lines.

3. If no pages are available from the free resource pool, the terminal reduces by one the allocation to the highest numbered session with more than one page.

4. If a previously saved setting is not restored, the terminal displays the information message "Incompatible setting not restored, check pages per session and lines per page" on the error line. The message is cleared on the next keystroke.

2–16 Set-Up

The principle used is to restore all the settings possible, replace those individual settings that can’t be restored with some reasonable default, and display the information message "Incompatible setting not restored..." if necessary. This same principle is used in all cases where settings cannot be copied or restored due to resource limitations or conﬂicts with other settings.

The active session number is not saved in NVM. Restore settings for all does not change the active session.

2.6.6 Copy Settings from Menu

The Copy settings from menu allows you to copy settings from another session to the current one. The currently active or in-use settings are copied so it is not necessary to save settings in one session before copying them to another.

The communications port selection and print port selection are not copied. The VT520 conceptual model is four terminals sitting on your desk. Copying settings from one terminal to another does not transfer the communication cables. Copying settings to a disabled session does not automatically enable it since the "Comm = session off" setting is not changed.

The session name if any is not copied. Since the conceptual model is four terminals, copying settings does not copy the label on each terminal. The page memory allocation is copied unless there are not sufﬁcient pages available in the free resource pool. In this case, the page memory allocation remains unchanged, and the information message "Incompatible settings not restored, check pages per session and lines per page" is displayed.

Set-Up

2.6 Session Menu

2.6.7 Update Session

The Update session menu controls how a session is updated when it is not the active session.

• Only when active prevents the session from being updated unless it is the active session.

• When available allows the page memory of this session to be updated when the VT520 is not otherwise busy with the active session (factory default).

• At regular intervals ensures that the page memory of this session is updated on a regular basis. Updating an inactive session at regular intervals slows down the active session as necessary.

Increasing the number of sessions assigned to a communication port from 1 to 2 causes the terminal to send the TD/SMP ENABLE_SESSIONS command. Conversely reducing the number of sessions from 2 to 1 sends a TD/SMP DISABLE_SESSIONS command. Pressing Control while selecting "Clear comm" in Set-Up also sends DISABLE_SESSIONS.

Note

Set-Up 2–17

Set-Up

2.7 Resetting and Restoring Defaults

2.7.1 Reset Session

The Reset this session menu selection only resets the active session. To reset all four sessions, press the Control key while you select Reset this session. Pressing Control/Set- Up from within Set-Up initiates a power-up reset.

2.7.2 Restore Factory Defaults

2–18 Set-Up

2.8 Display Menu

Many of the features in the Display menu can be controlled by the host control functions listed in Table 2–3. The control functions listed by function in Chapter 4 and are described fully in Chapter 5.

Table 2–3 Display Set-Up Features and Control Functions

Display Set-Up Feature Factory Default Host Control Code

Lines per screen 24, 25 or 26 DECSNLS

[ ] Auto resize DECARSM

Lines per page 24 lines x 3 pages DECSLPP

[ ] Review previous lines -

Columns per page 80 Columns DECCOLM

[/] Clear on change DECNCSM Status display Local status DECSSDT Scrolling mode Jump DECSCLM DECSSCLS Screen background Dark DECSCNM Cursor display Block DECSCUSR

[/] Blink -

[/] Enable cursor DECTCEM Cursor coupling -

[/] Vertical coupling DECVCCM

[/] Page coupling DECPCCM Cursor direction Left to right DECRLM Copy direction Left to right DECRLCM Zero 0 DECSZS [ ] Auto wrap DECAWM [ ] New line mode LNM [ ] Lock user preferences [ ] Show control characters CRM CRT saver 15 minutes DECCRTSM

[/] Host wake-up Energy saver 15 minutes DECEST [ ] Overscan DECOSCNM (mono model

only) [ ] Framed windows Screen alignment... DECALN

Set-Up

Set-Up 2–19

Set-Up

2.8 Display Menu

2.8.1 Lines per Screen

This menu chooses a font that enables the selected number of lines to be viewed. Note that you cannot view more lines than the number of lines on a page (Lines per page).

If the Status display is enabled, it is displayed using one of the same Lines per screen as the text for the corresponding session.

This is an operator preference feature and cannot be changed by control functions if the operator preference is set to Lock user preferences; however, if Auto resize is enabled at the same time, then the number of Lines per screen changes when the page size changes.

This feature can be changed from the host using the DECSNLS control function. Or, it may be changed indirectly from the host if Auto resize is selected and the page conﬁguration is changed using DECSLPP.

2.8.1.1 Auto Resize

When Auto resize is enabled, the number of lines per screen changes automatically each time the page arrangement changes, either by the host or through Set-Up. Table 2–4 shows how the screen size changes whenever the page size changes when Auto Resize is set.

Table 2–4 Lines per Page vs. Lines per Screen When Auto Resize is Set

Lines per Page Lines per Screen

24 26 25 26 36 43 42 43 43 43 48 52 52 52 72 52

If Auto resize is enabled in Display Set-Up, switching to two windows will set lines per screen to 48 and switching to one window will set lines per screen to correspond with the most recent lines per page setting, as if DECSLPP had been received. This applies to all sessions with auto-resize enabled.

2.8.2 Lines per Page

This menu allows you to select the page size in lines and number of pages. The page size determines the addressing range for cursor positioning and scroll regions. The number of lines that can be displayed depends on the current setting of the Lines per screen feature.

Lines per page sizes not available based on the current page memory allocation are dimmed. If the page memory allocation is changed such that the currently selected number of lines per page is not available, the factory default page size is used (24 lines per page for the VT emulations).

2–20 Set-Up

When the Review previous lines feature is selected, the Lines per page selections show the corresponding number of lines by only one page (Figure 2–7).

Figure 2–7 Lines per Page

Set-Up

2.8 Display Menu

This ﬁeld is also invoked by the DECSLPP control function.

2.8.3 Review Previous Lines Buffer

The Review previous lines feature when selected re-arranges page memory into a single page and a scroll back buffer (transcript). Lines of text scrolled up from the ﬁrst line of the page are saved in the scroll back buffer (replacing the oldest lines saved if any). Pressing Control with the up or down arrow keys pans the screen window up or down allowing you to view lines previously scrolled off the top of the page up to the number of lines saved in the scroll back buffer. If the page size is larger than the window size, pressing Control with the up arrow key ﬁrst pans to the top of the page and then pans into the scroll back buffer.

Any time lines in the scroll back buffer are available, a small down and/or up arrow appears at the lower right position of the status line to indicate there are additional unseen lines of the page below or above. When any text is received from the host for this session, the screen window is automatically repositioned to show the single page before the display is updated. Switching sessions does not automatically reposition the screen allowing you to view the scroll back data in one window while working in another. The number of lines that can be saved in the scroll back buffer is one page less than the total number of lines (in 25 line pages) allocated to the session virtual terminal. The factory default for Review previous lines is disabled.

You cannot copy and paste from the scroll back buffer.

Set-Up 2–21

Set-Up

2.8 Display Menu

2.8.4 Columns per Page, Clear on Change

This menu allows you to select an 80- or 132-column display for text. If Clear on change is disabled, changing this feature does not clear page memory, except

when changing from 132 columns to 80 columns; then, columns 81 through 132 of each page are cleared. Changes to this ﬁeld take effect immediately.

This ﬁeld is also invoked by the DECSCPP and DECCOLM control functions. The Clear on change feature affects the behavior of the DECCOLM sequence or 80/132 column mode setting only. It does not erase page memory. The factory default is "clear on change" for backward compatibility with previous terminals.

2.8.5 Status Display

The Status display can be enabled in the following selections:



Local status



Host writable or editing



None

2.8.6 Scrolling Mode

The Scrolling mode menu allows you to select how fast lines appear on the screen.

Scroll Selection Scroll Rate

Slow smooth Smooth steady scroll at approximately 9 lines per second

Fast smooth Smooth scrolls at approximately 18 lines per second. Jump Displays new lines as fast as they are received, causing a jump

This is a user-preference feature. If Lock user preferences is set, then this ﬁeld is not invoked by any control functions.

2.8.7 Screen Background

The Screen background can be either dark or light, with dark as the default.

2.8.8 Cursor Display

The Cursor display can be enabled in the following selections:



Block



Underline

Blink

Enable cursor

2.8.9 Cursor Coupling

Cursor coupling can be Vertical and/or Page coupling selectable from a single submenu.

(two scan lines per frame time).

scroll on the screen.

2–22 Set-Up

Vertical Coupling

Vertical coupling selects whether the user window automatically pans to follow the cursor when the cursor is moved vertically to a part of the page that is not in the currently displayed user window. Panning does not occur until the input buffer becomes empty and the cursor is displayed.

When Vertical coupling is disabled, the user window does not follow the cursor. If the cursor moves above or below the visible portion of the page, the cursor is no longer visible.

Page Coupling

Page coupling selects whether the user window automatically follows the cursor when the cursor is moved to a page that is not currently in the user window. When page coupling is enabled, moving the cursor to a page that is not currently displayed causes that page to be displayed. Panning does not occur until the input buffer becomes empty and the cursor is displayed.

When Page coupling is disabled, the user window does not follow the cursor. If the cursor moves to a page that is not currently displayed, the cursor is no longer visible.

2.8.10 Writing Direction

The Writing direction and copy direction defaults are left to right. If a Hebrew keyboard is connected to the terminal, a selection is available for advancing or copying right to left.

Set-Up

2.8 Display Menu

The writing direction and the copy direction should be matched.

2.8.11 Zero

A Zero feature allows you to select the style of the zero character: oval, zero with a slash, or zero with a dot.

2.8.12 Auto Wrap

Auto wrap selects where a received character is displayed when the cursor is at the right margin.

This is not a user-preference feature, so you cannot lock this feature. This ﬁeld can be invoked by the DECAWM control function. The Auto wrap

setting can be saved in NVM.

2.8.13 New Line Mode

When enabled, New line mode selects the characters transmitted by Return, CR, or CR+LF. It also determines the action taken by the terminal when receiving line feed, form feed, and vertical tab, LF, or CR+LF.

New line mode is not a user-preference feature, so you cannot lock it. This feature can be invoked by the DECNLM (SM/RM) control function.

2.8.14 Lock User Preferences

The Lock user preferences feature allows you to prevent the host from modifying user-preference features. If set to lock, the user-preference features cannot be changed by host control functions.

The following user-preference features are locked and unlocked by this feature and when locked, cannot be changed by control functions:

• Auto repeat

Set-Up 2–23

Set-Up

2.8 Display Menu

• Scrolling mode

• Screen background

• Tab stops

• Keyboard deﬁnitions

• Lines per screen

• Auto resize

• Overscan

2.8.15 Show Control Characters

Show control characters allows you to select a normal display or a display called Control Representation mode or CRM. This "monitor and show all" display includes graphic representation of control characters,

When Show control characters is enabled, special CRM symbols are used for the C0 and C1 control areas of ISO 2022 conforming character sets. Other characters are displayed using the current user preference supplemental set (DEC default character set).

2.8.16 CRT Saver

If the CRT saver feature is enabled the screen goes blank after the speciﬁed interval of no keyboard activity or receive character activity. This feature is intended to prevent phosphor aging and prolong the useful life of the CRT. When the CRT saver is active, the monitor goes into stand by mode.

Any keystroke instantly restores the display to show its previous contents. If Host wake-up is enabled, any character received from the host also restores

the display. The factory default setting is CRT saver enabled. If CRT saver = Never is selected, the Energy saver is dimmed and not available.

Monitor Mode VT520 Terminal Color Terminal

On Normal operation Normal operation Stand by Screen saver (~4 W) Video blank, no horizontal sync Suspend Energy saver (<15 W) Video blank, no vertical sync Off Same as Suspend Video blank, no sync

2.8.17 Energy Saver

The Energy saver feature switches the monitor to suspend mode after the speciﬁed interval of CRT saver active. Monitor suspend mode blanks the screen like CRT saver but also switches off the synchronization and deﬂection circuits of the monitor signiﬁcantly reducing the terminal’s power consumption. A keystroke may take several seconds to restore the display from suspend mode.

On the color model, Energy saver switches the monitor to off mode after 30 minutes in suspend mode. The monitor off mode is like suspend mode but also turns off the CRT cathode (heater) further reducing power consumption. From the monitor off mode, it can take 15 to 30 seconds to restore the display upon

2–24 Set-Up

Set-Up

2.8 Display Menu

detecting a keystroke. The color model follows the VESA convention for driving Energy Star

Received characters power the monitor back on from the Energy saver suspend or monitor off state only if CRT Saver Host wake-up is selected. Otherwise it is necessary to press a key to power the monitor back on.

2.8.17.1 Warning Bell

The terminal’s warning bell still operates normally in all energy saver states. Many host systems ring the warning bell to indicate new mail has arrived or to draw attention to an important system message. Upon hearing the bell, press any key to see the corresponding host message.

Energy saver = Never allows power to continue to be supplied to the monitor.

2.8.18 Overscan

Overscan can be enabled for the monochrome VT520. It is dimmed and not available for the color model.

2.8.19 Framed Windows

When the Framed windows check box is selected in the Display menu, window frames with title bars are added to each displayed window. The VT520 has a ﬂip screen and a two-window style with adjustable split. Window frames with titles and icons help you keep track of up to four sessions.

On the mono VT520, the Framed windows check box controls whether session windows are displayed with title bars and session icons.

compliant PC monitors.

8022480 no overscan, or 8002432 with optional overscan.

When Framed windows is selected, the overscan check box is dimmed. Framed windows is the factory default.

On the color terminal, only the 802 x 480 no overscan format is available. The Framed windows check box controls whether session windows are displayed with title bars and session icons (802 x 480 no overscan), or the window frame and icon scan lines are left blank. There is no overscan selection on the color terminal.

When the Framed windows check box is selected in the Display menu, window frames with title bars are added to each displayed window. The title bar shows the previously entered session name if any and is highlighted (ﬁlled in) when the session is active. A row of icons is presented across the top of the screen to help you to keep track of the other sessions.

An icon is displayed for each session in the cycle order followed by the icon name which consists of the ﬁrst 12 characters of the session name unless overwritten by host control function. The icon for the active session is displayed with the reverse video attribute. If the page memory of a session that is not currently visible is updated so that it contains new data which has not yet been seen, the corresponding session icon is displayed with the blink video attribute until the session is made active.

The Energy Star emblem does not represent EPA endorsement of any product or service.

Set-Up 2–25

Set-Up

2.8 Display Menu

When one session window is displayed, pressing the Session key alone cycles the active session in forward sequence by session number (S1, S2, S3, S4, S1,...). Pressing Shift/Session cycles the active session in reverse sequence by session number (S4, S3, S2, S1, S4,...). A session that is not assigned to a comm port (communications port select "Comm = session off") is omitted from the cycle order.

Control Session (F4) toggles the display between one window or two windows (Figure 2–8).

Figure 2–8 Framed Windows

A maximum of two of the possible four session windows can be displayed at a time. One of these must be the active session. When switching to two windows, the active session is displayed on top. When two windows are displayed, pressing the session key toggles the active session between the two sessions displayed. To activate a session not currently displayed, you can use

CapsLock 4

If the new active session’s window was not previously visible, it replaces the previously active session’s window. Alternatively, you can select any session through the Set-Up Session submenu. Note: CapsLock/F1 is a synonym for F11

on the PC keyboards.

When two windows are displayed, the relative size of each window is adjustable by pressing Control and Shift with the up or down arrow keys to move the border between the windows up or down.

2–26 Set-Up

CapsLock 1

kpd through

kpd to select the corresponding session 1 through 4 making it active.

You cannot display the same session in both windows at the same time.

screen alignment . . . displays gray scale

bars and color bars for the monitor alignment.

1. Press

Enter

to display the gray scale bars.

2. Press

Enter

again to display the color bars.

Set-Up 2–27

Activating a session already displayed makes it the active session. If autoresize is enabled in Display Set-Up, switching to two windows will set lines per screen to 48, and switching to one window will set lines per screen to

correspond with the most recent lines per page setting as if DECSLPP had been received. This applies to all sessions with auto-resize enabled.

2.8.20 Screen Alignment

Screen Alignment on the VT520 Monitor

The Screen alignment menu item is used to invoke a screen alignment display (Figure 2–9) for the monochrome monitor only. With the screen alignment display, you can:

Set-Up

2.8 Display Menu

• Center the border using

• Rotate the border using

Shift

and arrow keys.

Ctrl

(

and

Ctrl

)

Screen rotation compensates for any magnetic ﬁeld in the area.

Figure 2–9 Screen Alignment Display

Hold down the Shift key while using the four arrow keys

to center the border on the screen.

Hold down the Control key while using the left and right arrow keys

to rotate the border on the screen.

Press Enter to return to the Set−Up menu.

MA−0022−93.GRA

Screen Alignment on the VT525 Color Monitor

For VT525 color monitors, Display

Set-Up

2.9 Color Set-Up

The Color Set-Up allows you to control the use of color by the terminal. The ASCII color mode, Reverse and blank attributes, and Intensity

attributes are only available in ASCII terminal emulation modes. Select color mode is only available in the non-ASCII terminal emulation modes

besides SCO Console mode which always uses ANSI SGR color.

Alternate text colors... is only available when Select color mode = Alternate color.

Figure 2–10 Color Set-Up Menu

2.9.1 Assign Colors

The Assign colors dialog box allows you to select normal display colors for text and windowing features. As the slider moves to select a color within the select color box, the corresponding item is displayed using that color. Changing the normal text background only re-writes the "Normal text" caption. It does not otherwise affect the color of text already displayed.

2–28 Set-Up

Figure 2–11 Assign Colors

Set-Up

2.9 Color Set-Up

The normal text background and foreground selections determine the writing color used when all SGR attributes are turned off. The other ANSI color SGR attributes are "hard wired" to corresponding color indexes. Each session maintains its own color assignments for normal text and other data within its window.

The window frame colors are global affecting all session windows and icons. The window frame includes the title bar and adjacent separator lines, the sides, and the bottom separator line.

The session icons and keyboard indicator line foreground are displayed using the Window frame foreground color (or background color when dark text on a light background is selected). The icon and keyboard indicator line background uses the screen background color to merge with the screen border rather than the window title bar.

New color assignments do not take affect until you press OK. Color assignments can be saved in NVM or restored to their factory defaults the same as other Set-Up features.

It is possible to assign text foreground and background colors that make subsequent text difﬁcult to read. Set-Up is displayed using the factory default colors with the exception of those dialog boxes that affect color selections. This ensures that Set-Up is always usable.

Set-Up 2–29

Set-Up

2.9 Color Set-Up

2.9.2 Alternate Text Colors

Figure 2–12 Alternate Colors

The Alternate Text Colors dialog box allows you to specify colors for any combination of text renditions (bold, reverse, underline, blink) when the Color mode is set to Alternate text colors. Operation of the dialog box is similar to the Assign Colors dialog box described above. If Underline text is selected, text with the underline attribute will be underlined as well as displayed using the speciﬁed color. If Blink text is selected, text with the blink attribute will blink as well as appearing in the speciﬁed colors.

• The attributes are displayed in the selected colors allowing you to see the effect desired.

• All combinations can be speciﬁed, providing backward compatibility with other video terminals.

• The foreground color of text with the invisible attribute becomes the background color.

2–30 Set-Up

2.9.3 Deﬁne Colors Dialog Box

Figure 2–13 Deﬁne Colors

Set-Up

2.9 Color Set-Up

The Deﬁne colors dialog box allows you to deﬁne the terminal’s color map with 16 colors from a palette of 4096 colors. This dialog box is intended for adjusting the appearance of individual colors. Radical changes to the terminal’s color map may adversely affect the appearance of ANSI color SGR parameters. In the VT520, each session uses its own independent color map which is not affected by the others.

The boxed areas containing capital letters A-P represent the 16 colors currently deﬁned. The selected color number (0-15) remains highlighted in reverse video while the highlighting cursor moves to the RGB sliders and then down to the labeled buttons.

Color deﬁnition changes become visible immediately since the terminal has a single active color map. Cancel restores the color map to the settings in effect when the OK or Save button was last pressed. The OK and Cancel buttons exit this dialog box. Pressing Save is similar to pressing OK but also writes the settings to NVM to be used as the power-on settings. Restore recalls the power-on settings from NVM. Use default recalls the factory default settings.

It is possible to deﬁne colors that make subsequent text difﬁcult to read. Set-Up is displayed using the factory default colors with the exception of those dialog boxes that affect color selections. This ensures that Set-Up is always usable.

Set-Up 2–31

Set-Up

2.9 Color Set-Up

2.9.4 Select Color Mode

The Select color mode feature allows you to select how applications will display text colors.

• When ANSI SGR color is selected, color text is speciﬁed using the ANSI deﬁned SGR color parameters. The terminal uses factory default renditions for text attributes as deﬁned in Table 2–5.

• When Alternate color is selected, the terminal displays text renditions as deﬁned in the Alternate Text Colors dialog box.

• When Mono is selected, the terminal uses a default monochrome or gray level map designed to maintain the appearance of applications that were not designed to use color.

Table 2–5 Default Graphic Renditions

Graphic Rendition Factory Default Display

Normal text background Color index 0 Normal text foreground Color index 7 Bold text foreground Color index + 8 Bold text background Color index (unchanged) Reverse text Write text foreground with background color and

background with foreground color.

The Color selection maintains a current graphic rendition that includes a text background color and text foreground color. Reverse text does not exchange the foreground and background colors stored as part of the graphic rendition, rather, it causes the text foreground to be written with the background color and vice versa. Specifying a new foreground color always modiﬁes the "foreground rendition." Subsequent text written with the Reverse attribute will write this color as its background.

2.9.5 ASCII Color Mode

The ASCII color mode determines the use of color in the ASCII terminal emulation modes. Color emulates WYSE 325 color. Mono uses a default monochrome or gray level map designed to maintain the appearance of ASCII terminals using applications that were not designed to use color.

2.9.6 Bold and Blink Style

Bold and blink style selects whether the bold and blink attributes bold and blink the text foreground only, or both foreground and background. By default, bold adds 8 to the corresponding color index value to select a brighter or dimmer color, and blink cycles the text color between its non-blink rendition and a dimmer less saturated shade of the non-blink rendition.

2.9.7 Erase Color

The Erase color selection controls the background color used when text is erased or new text is scrolled on to the screen. Screen background causes newly erased areas or scrolled text to be written using color index zero, the screen background. This is VT and DECterm compatible. Text background causes erased areas or scrolled text to be written using the current text background color. This is PC console compatible and is the factory default.

2–32 Set-Up

2.9.8 Reverse and Blank Attributes

The Reverse and blank attributes selection controls whether the reverse or blank text attributes are mapped to different colors in WYSE 325 emulation.

When Map reverse attribute is selected:

1. The characters with reverse attribute are displayed by the color which is assigned to the REVERSE/BLANK map in the color palette.

2. The characters with blank attribute are displayed by the color which is assigned to the NORMAL map in the color palette.

When Map blank attribute is selected:

1. The characters with reverse attribute are displayed by exchanging the foreground and background of the NORMAL map in the color palette.

2. The characters with blank attribute are invisible; that is, the foreground falls back to the background of the REVERSE/BLANK map in the color palette.

2.9.9 Intensity Attributes

The Intensity attributes check box operates in WYSE 325 color mode. When Enabled:

Set-Up

2.9 Color Set-Up

1. The characters with dim attribute are displayed in a lower intensity.

2. The characters without dim attribute, but were written in intensity disabled mode are displayed in a lower intensity when intensity mode is changed to enable.

When Disabled:

All characters are displayed with their normal intensity.

2.10 Terminal Type Menu

You can select terminal type and emulation modes using this menu.

2.10.1 Emulation Mode

Emulation mode is the primary means of selecting different terminal modes or emulations. Changing terminal modes or emulations usually performs some initialization of the terminal state.

Changes to the terminal emulation mode take effect immediately (as soon the emulation mode submenu is exited). Other Set-Up parameters are updated accordingly based on the new emulation mode without exiting Set-Up.

Example: Selecting a VT mode performs a soft terminal reset (DECSTR).

PCTerm mode can be selected or deselected independently from the other emulations. The ASCII modes use WYSE PCTerm. The ANSI modes use VT PCTerm. The ASCII color mode uses WYSE 325 emulation.

This feature corresponds to the DECPCTERM, DECTME, DECANM, and DECSCL control functions described in Chapter 5.

Changing the conformance level (DECSCL) does not change the operating level reported to identify the terminal to the host. It only changes the way extensions are reported.

Set-Up 2–33

Set-Up

2.10 Terminal Type Menu

• Printer operations are not affected or halted by a change in mode.

• A soft reset is always performed as a result of a mode change from

Set-Up.

• Changes resulting from most, but not all, of the above sequences also

cause a soft reset. Exception: Entering VT52 mode (via DECANM) does not cause a soft reset from VT100 mode, but does cause a soft reset from VT500 mode.

2.10.2 Terminal ID to Host

Terminal ID to host selects how the terminal identiﬁes itself to host software, speciﬁcally the Primary Device Attributes response (DA). The default ID is "VT520."

For a list of the responses, see the Device Attributes sections in Chapter 5. This ﬁeld has no effect when the terminal is in VT52 mode. The feature corresponds to the DECTID control function described in Chapter 5.

Notes

2.10.3 VT Default Character Set

This feature selects the default international character set to use for output as initialized in G0-G3 and GL/GR. It corresponds to the DECAUPSS (Assign User Preference Supplemental Set) control function described in Chapter 5.

Only ISO Latin-1 and DEC Multinational are available on the North American terminal.

2.10.4 PCTerm Character Set

This feature selects the PC code page, ISO character set, or DEC character set to be used in PCTerm mode and SCO Console mode. This feature is also invoked by the DECPCTERM control function described in Chapter 5.

2.10.5 7-Bit NRCS Characters

This feature enables National Replacement Character Set mode (DECNRCM), as described in Chapter 5. When 7-bit NRCS characters are selected, a corresponding 7-bit NRC set is used depending on the keyboard language. See Chapter 8 for details. Group 2 or secondary keyboard language characters may still be used if they are in the 7-bit character set. This feature is dimmed unless there is a corresponding NRC set available. This feature is not available on the North American terminal.

2.10.6 Transmit 7-Bit Controls

Transmit 7-bit controls selects whether C1 control codes are sent in their original 8-bit form (disabled) or converted to their 7-bit ESC Fe form.

This ﬁeld is invoked by a parameter to the DECSCL control function and by the S7C1T and S8C1T control functions.

2–34 Set-Up

2.11 ASCII Emulation Menu

Figure 2–14 ASCII Emulation Menu

Set-Up

2.11 ASCII Emulation Menu

The features, shown in Figure 2–14 and listed in Table 2–6, are speciﬁc to the ASCII emulation modes supported in the VT520. The default is shown in boldface type. Refer to Part III for details.

Table 2–6 ASCII Emulation Features

Feature Selections Determine...

Data lines 24, 25, 42, 43

Pages 1

Attribute Character,

Write protect attributes

Received CR CR or CRLF Carriage return or carriage return line feed. Block Mode Conversation

Block End US/CR or

lines

4 *

line, or page Dim, blank,

reverse, underline, and/or blink.

or Block

CRLF/ETX

The number of data display lines visible, not counting any status lines.

The page size and number of pages. 1 selects each page to be the number of data lines visible on the screen. The * makes the display of a single page invisible.

How visual attributes are applied per character, line, or page.

The visual attributes used to highlight and specify write protected data.

Transfer method.

At the end of a block transfer, transmit a carriage return or an end-of-text character.

lines

Set-Up 2–35

Set-Up

2.12 Keyboard Menu

Figure 2–15 Keyboard Menu

Several of the features shown in Figure 2–15 are self-explanatory and correspond directly to control functions listed in Table 2–7. For additional information, see Chapters 4 and 5.

Table 2–7 Keyboard Features and Control Functions

Set-Up Feature Control Function

Keyboard language DECKBD Switch between primary and

secondary keyboard language Caps lock function DECLCK Keyclick volume DECKCV Warning bell volume DECWBV Margin bell volume DECMBV Keyboard encoding DECKPM Auto repeat DECARM Data processing keys DECKBUM Application cursor keys DECCKM Application keypad mode DECKPNM, DECKPAM, DECNKM

DECESKM (general), DECHEBM (Hebrew), DECNAKB (Greek), DECCYRM (Cyrillic)

2–36 Set-Up

2.12.1 Keyboard Language

Some keyboards allow you to select two different keyboard layouts and easily switch between them (English and Hebrew, for example). This feature allows the VT520 to support both existing conventions and emerging standards for extending the graphic input and/or switching between languages in dual language environments. (The North American keyboard has only one keyboard language, English.)

The primary keyboard language corresponds to Group 1 (per DIN 2137) and generally references the legends on the left half of the keytops.

The secondary keyboard language corresponds to Group 2 (Group Shift per DIN

2137) and generally references the legends on the right half of the keytops.

Set-Up

2.12 Keyboard Menu

Unless overridden,

Ctrl/Alt/F2

makes the secondary keyboard language active. (These are factory

defaults, standard on PCs.) Selecting a new keyboard language in Set-Up automatically initializes the

keyboard character set, as described in Chapter 8. Changes to this ﬁeld take effect immediately. Changing this ﬁeld to North

American or Dutch and then exiting Set-Up or going to another menu resets the 7-bit NRCS characters feature to disabled. There is no "7-bit characters" mode for the North American or Dutch keyboards. This ﬁeld affects the language of the keyboard indicator line.

2.12.2 Deﬁne Key Editor

The Deﬁne Key Editor is an advanced function that allows the terminal to adapt to environments that do not match the preprogrammed settings.

This function is designed to be easy to use; however, unless you understand the consequences of remapping various key combinations, use caution when using this feature.

The Deﬁne key menu invokes the Deﬁne Key Editor.

Ctrl/Alt/F1

makes the primary keyboard language active, and

Caution

To ensure consistent access to Set-Up features, the following rules apply for interpreting keystrokes.

• Within Set-Up and the Deﬁne Key Editor, the four arrow keys along with

Enter,Return,Do,Select

standard deﬁnitions, regardless of how they may be redeﬁned at other times. The delete key will erase a ﬁeld when deﬁning an alphanumeric key. The one exception is when pressing the key to be deﬁned.

• When you pressF3as the ﬁrst key after the terminal is powered on, you always enter Set-Up, regardless of which keyboard you use or how deﬁned.

• When copying one key deﬁnition to another, the standard key deﬁnition for a key is copied, not the current deﬁnition. This copy method ensures that keyboard functions are not lost within the Deﬁne Key Editor.

and delete key <

are interpreted according to their

Set-Up 2–37

Set-Up

Return

; the Deﬁne Key Editor menu will appear.

2. Press the key for which you want to assign a new behavior. If the key is a function key, a screen similar to Figure 2–16 is displayed. Names are displayed in the Set-Up language selected (not according to keyboard language). The ± symbol indicates a toggle feature. Names are truncated to 12 characters in the deﬁnition ﬁeld.

3. Press

)

to highlight the Copy of key default radio button () and press

Enter

4. Press the key whose factory default behavior is what you want your deﬁned key to do.

5. Press

to highlight the OK or Apply button and press

Enter

2–38 Set-Up

2.12 Keyboard Menu

Figure 2–16 Deﬁne Key Editor, Select Function

MA−0324−93.GRA

2.12.2.1 Copy of Key Default—Moving a Standard Function

The simplest way to reprogram a key is to copy the behavior of another key. You can use Copy of key default to copy the factory default for a key to be deﬁned to any position on the keyboard. You cannot, however, use this feature to edit the code transmitted by individual keys. To move factory default key functions:

1. From the Keyboard menu item, select the Deﬁne key . . . function and press

2.12.2.2 Customization

If you want to program a key to behave differently than one of the factory deﬁned keys, then you will need to know about the following key categories:

Set-Up

2.12 Keyboard Menu

Function: Keys such as the arrow keys (*,+,(,)), the

Alphanumeric: Keys used to transmit alphanumeric characters.

Set-Up key, used to transmit function key sequences or to perform local terminal functions.

2.12.2.3 Modiﬁer Keys

Modiﬁer keys vary from within the Function and Alphanumeric categories. A modiﬁer key is a key that modiﬁes the behavior of other keys when it is pressed and held down. For example, pressing an alphanumeric key in combination with

Shift

the

modiﬁer key will normally send the shifted or uppercase characters for

that key. Modiﬁer keys are treated as a special kind of local terminal function. The VT520

function modiﬁer keys are: be modiﬁed by pressing (Shift-2). Modiﬁer keys themselves cannot normally be modiﬁed by other keys. A key assigned to act as the sequence when pressed in combination with makes all assignable combinations of that key act as a modiﬁer.

2.12.2.4 Creating a New Function

To deﬁne a new function key:

1. From the Keyboard menu item, select the Deﬁne key . . . function and

Return

press

; the Deﬁne Key Editor menu will appear.

2. Press the key for which you want to assign a new behavior.

Shift,Ctrl

Group Shift(Alt Gr

Shift

, and

modiﬁer, for example, cannot transmit a function

Shift

modiﬁer key, or the

Alt

. VT520 alphanumeric keys can also

on enhanced PC keyboards) and

Alt

. Deﬁning a key as a modiﬁer key

Alt/Shift

3. Press the

Enter

press

4. Press the

(

and

)

key to highlight the Function radio button () and

keys to highlight the modiﬁer combination that you

want to deﬁne (Unshifted, Shifted, Control, and so on) and press

5. Press the and press

6. Press the

)

key to move to the Select function scroll box. Press the

keys to highlight the desired keystroke function from the list and

Enter

(

key to return to the Modiﬁers.

7. Repeat steps 4 through 6 to deﬁne other modiﬁer combinations as desired.

8. Use the arrow keys (*,+,(,)) to highlight the OK or Apply button and

Enter

press

2.12.2.5 Examples of Creating New Functions

Examples of when to create new functions include:

• Changing the <

Delete

when shifted.

• Disabling the

Compose,Break

function.

Enter

key to delete when unshifted and to backspace

, and Set-Up keys by assigning them to have no

Set-Up 2–39

Set-Up

2.12 Keyboard Menu

2.12.2.6 Correcting a Mistake

If you make a mistake or want to start over, choose the Cancel button. Use Actions.Restore factory defaults to restore the factory default settings.

2.12.2.7 Creating A New Alphanumeric Key or Keyboard Layout

The method for creating a new alphanumeric key is similar to that for function keys, except that you can deﬁne different modiﬁer combinations and you enter alphanumeric values differently.

If the key was previously programmed as a function key, the function deﬁnition will be empty. Once any function deﬁnition is applied, all the alphanumeric deﬁnitions for that key are lost. A single key cannot act as both a function key

and an alphanumeric key simultaneously.

To deﬁne a new alphanumeric key:

1. From the Keyboard menu item, select the Deﬁne key . . . function and

Return

press

2. Press the key for which you want to assign a new behavior.

; the Deﬁne Key Editor menu will appear.

3. Press the and press

(

Enter

)

key to highlight the Alphanumeric radio button ()

. The character transmitted when this key is unshifted is

highlighted.

4. To select a different character, press the corresponding key on the keyboard, or use the numeric compose key to generate a new character.

5. If desired, press the)key to move to the Non-spacing accent scroll box. Press the and press

Enter

and

keys to highlight any non-spacing accent from the list

6. The code transmitted by the unshifted alphanumeric key when pressed in combination with the Control key is calculated automatically and displayed in the Deﬁnition column. If desired, you may redeﬁne this function.

7. If desired, select an Alt Function modiﬁer combination for the alphanumeric key from the Select Function scroll box. You may choose a function, including a user-deﬁned key (UDK) sequence. The default for the Alt Function is None.

8. Press the(key to return to the modiﬁer selection.

9. Use the arrow keys (*,+,(,)) to highlight the OK or Apply button and

Enter

press

To enter alphanumeric values you can type the desired character or numeral, you can compose the desired character including numeric keypad compose, or you can select a nonspacing accent from the nonspacing accent scroll box.

2.12.2.8 Examples of Creating New Alphanumeric Keys

Examples of when to create new alphanumeric keys include:

• Making the comma and period keys send comma and period instead of angle brackets when shifted.

• Changing the keyboard from a QWERTY to QWERTZ layout.

• Deﬁning an alternate key layout to match your own preference or local typing conventions (Dvorak, or Russian Cyrillic, instead of Bulgarian Cyrillic).

2–40 Set-Up

2.12.2.9 User-Deﬁned Keys

The UDK radio button allows any key to be programmed with a user-deﬁned sequence. UDKs are a subset of function keys. A separate UDK dialog box is provided for simplicity. Selecting UDK causes a UDK: text ﬁeld to be displayed so you can enter a key sequence. This text ﬁeld can scroll left or right as needed to allow longer strings to be entered.

Set-Up

2.12 Keyboard Menu

Enter control codes by holding the decimal value for the code on the Numeric keypad. Codes may also be entered on the Numeric keypad in column/row format as follows:

Compose 1 . 1 1

Press

again to move the highlighting cursor to select one of the following

UDK directions:



Normal The sequence is sent to the host and/or to the screen depending on



Terminal only The sequence is sent only to the screen, as if it had just been



Host only The sequence is sent only to the host, regardless of the

Press

again to select one of the following buttons:

OK Apply Cancel

When you select Cancel, you only cancel the changes to the currently selected modiﬁer combination.

2.12.2.10 Programming Notes

• When you pressF3as the ﬁrst key after the terminal is powered on, you always enter Set-Up, regardless of howF3is deﬁned.

Compose

the communication settings (On-line, Local echo, Half duplex, and so on).

received from the host.

communication settings.

Alt

key down and entering the

• The factory default Break function (unshifted F5) cannot be reprogrammed by host control sequence. This is necessary to support secure attention. If the sequence is received, the factory default keystroke table entry for Break is not overwritten.

• If a key is programmed to act as a modiﬁer key, it operates as a modiﬁer with any combination of

Shift,Alt

, or

Control

• If a key is programmed to be a modiﬁer key and modiﬁer key reporting is enabled using DECSMKR, the key sends the VT sequence for the left modiﬁer key when there is more than one.

Caps Lock

•

combinations such as extensions and cannot be reprogrammed by DECPFK. The as a modiﬁer. The

Caps Lock

Caps Lock/Print Screen

are local keyboard

Caps Lock

key acts

function can be moved to another key, but

Pause

must still send the Break.

• Use of the Deﬁne Key Editor to redeﬁne keys on the numeric keypad affects only the Num Lock off state of these keys. When Num Lock is engaged, these keys will always send their factory default ASCII numerals (and related characters) intended for numeric input. The Num Lock behavior of these keys cannot be reprogrammed. (This Num Lock behavior does not apply to numeric keypad mode on the VT keyboard or PC keyboard in VT style.)

Set-Up 2–41

Set-Up

2.12 Keyboard Menu

• The toggle Num Lock function can be assigned to any single key combination. Although the Num Lock state modiﬁes other keys, the toggle Num Lock function is not a modiﬁer key. This means modiﬁer combinations of

Num Lock/Key

• Use of the numeric keypad to compose characters by entering their decimal code in combination with work regardless of any reprogramming of keys on the numeric keypad, unless such reprogramming directly conﬂicts with use of the keypad in this manner. Example: A numeric keypad key has been deﬁned as

• Function keys also work in VT100 mode.

2.12.3 Save Key Deﬁnitions

To save your key deﬁnitions so they will be available the next time you turn the power on, select the Save key deﬁnitions menu item from the Keyboard menu.

This action ﬁeld on the keyboard menu (Figure 2–15) causes the Deﬁne key modiﬁcations to be saved to nonvolatile memory independently from any other Set-Up features. Key deﬁnitions are saved on a ﬁrst-come ﬁrst-served basis and are limited by the total amount of nonvolatile memory available.

This feature cannot be invoked by a host control function.

can be assigned to any other function or user-deﬁned sequence.

Alt Gr

Compose

(held down) should continue to

Compose

Alt Gr

2.12.4 Recall Key Deﬁnitions

This action ﬁeld causes previously saved Deﬁne key modiﬁcations to be recalled from nonvolatile memory independently from any other Set-Up features.

2.12.5 Lock Key Deﬁnitions

The Lock key deﬁnitions menu item operates as a check box. When key deﬁnitions are locked, they cannot be reprogrammed from the host.

2.12.6 Caps Lock Function

This function allows you to enable the



Caps lock Lock alpha keys on main keypad in uppercase setting.



Shift lock Lock alpha and numeric keys on main keypad in shifted setting.



Reverse lock Works the same as Caps Lock, except that pressing the

will send the lowercase or unshifted character assigned to a key.

Lock

Caps Lock

2.12.7 Keyclick, Warning Bell, and Margin Bell Volume

The volume of these settings can be set to high, low, or off, with high as the default.

Suppress repeated warnings causes the terminal to ignore Control-G warning bells encountered within two seconds of a previously sounded warning bell. When using multiple sessions, this feature prevents broadcast messages sent to more than one session from sounding the warning bell repeatedly for each session. Alternatively, if several broadcast messages are pending in an inactive session, the warning bell sounds once when the session is made active.

key to do the following:

Shift

key

2–42 Set-Up

2.12.7.1 Visible Bell

The terminal provides a Visible bell feature, which ﬂashes a bell ringing font whenever a sound is generated. The fonts will ﬂash six times and disappear in 2 seconds automatically. In ANSI mode, the bell is displayed at column 16 of the keyboard indicator line (same place as the sticky keys indicator). In ASCII mode, the bell is displayed at column 23 of the status line These bell fonts may temporarily replace another indicator on the screen.

2.12.8 Keyboard Encoding

The Keyboard encoding menu allows you to select from the following:



Character (ASCII) The keyboard uses normal ANSI/ISO character encoding.



Scancode The terminal transmits make and break codes for each



Key position The keyboard transmits key position codes for each down

This feature corresponds to the DECKPM (key position mode) control function described in Chapter 5.

Set-Up

2.12 Keyboard Menu

keystroke corresponding to the hardware scan codes used by PC keyboards (scan set 1).

transition. This menu allows alternate keyboard layouts to be supported by application software.

2.12.9 Auto Repeat

The Auto repeat feature selects whether keys begin auto repeating if still held down after a delay interval:



Fast (30/sec)



Slow (10/sec)



Off

The repeat rate is the number of "keystrokes" per second, not characters per second. Changes to this ﬁeld take effect immediately.

This is a user-preference feature. When it is unlocked, this feature can be invoked by the DECARM control function.

2.12.10 Data Processing Keys

This feature corresponds to the DECKBUM control function described in Chapter

5. Changes to this ﬁeld take effect immediately.

2.12.11 Application Cursor Keys

This feature corresponds to the DECCKM control function described in Chapter

5. This feature is reset to the factory default setting by DECSTR.

Changes to this ﬁeld take effect immediately. Settings for Application cursor keys (AppCK) and Application keypad mode

(AppKM) selected in Set-Up can be saved to NVM and used as the power-on settings. Settings for AppCK and AppKM selected by host control functions affect the current operating state, as shown by the check boxes, but are not saved in the NVM.

Set-Up 2–43

Set-Up

2.12 Keyboard Menu

2.12.12 Application Keypad Mode

This feature selects whether the numeric keypad sends ASCII numerals or application function sequences. It corresponds to the DECKPNM, DECKPAM, and DECNKM control functions described in Chapter 5.

This ﬁeld is reset to the power-up setting when a soft reset occurs (Reset Session or receipt of DECSTR).

Changes to this ﬁeld take effect immediately so you can use the keypad to enter an Answerback message.

2.12.13 Map PC Keyboard to VT

Map PC keyboard to VT causes the terminal to treat a PC layout keyboard as if it were a VT keyboard. F1-F5 behave as local function keys (Hold, Print, Set-Up, Session, Break). Editing and numeric keypad keystrokes work the same as the corresponding keys on a VT keyboard (PF1-PF4 are recognized instead of NumLock and other PC legends).

This feature is only available when a PC keyboard is used and can be toggled on or off by pressing CapsLock/NumLock.

2.12.14 Ignore Missing Keyboard

When selected, Ignore missing keyboard causes the terminal to ignore a missing keyboard during power-up selftest instead of displaying a "Keyboard error" message.

2–44 Set-Up

2.13 Communication Menu

Figure 2–17 Communication Menu

Set-Up

2.13 Communication Menu

Several of the Communication features shown in Figure 2–17 are self-explanatory and correspond directly to control functions listed in Table 2–8. These functions are described in Chapter 5.

Table 2–8 Communication and Modem Features and Control Functions

Set-Up Feature Factory Default Host Control Code

Communication

Port select S1=comm1, S2=comm2,

DECSCP

Print=comm3

(continued on next page)

Set-Up 2–45

Set-Up

2.13 Communication Menu

Table 2–8 (Cont.) Communication and Modem Features and Control Functions

Set-Up Feature Factory Default Host Control Code

Transmit rate limit 150 cps DECXRLM DECSTRL Fkey rate limit 150 cps DECSTRL [/] Ignore Null character DECNULM [ ] Local echo SRM [ ] Half duplex DECCHDPXM [ ] Auto answerback Answerback message... DECLANS [ ] Answerback concealed DECCANSM

Modem

[ ] Enable modem control DECMCM Disconnect delay 2 seconds DECSDDT Modem high speed Ignore Modem low speed Ignore -

2.13.1 Communication Port Select

The Communication.Port Select dialog box (Figure 2–18) allows you to specify which of the VT520’s serial communication ports (comm1..comm3) are used by each session. The sessions are identiﬁed across the top of the dialog box with the session icon name.

Figure 2–18 Communications—Port Select

If more than one session is assigned to a single communications port, the Terminal Device/Session Management Protocol (TD/SMP) is used. Pressing the Session key (F4) cycles through each session 1 through 4 in order making it the active session and establishing the corresponding connection as needed.

2–46 Set-Up

MA048493.GRA

Set-Up

2.13 Communication Menu

If sessions are not yet enabled on the corresponding port, the TD/SMP enable sessions command is issued and the ﬁrst session connection on this port is established. If the corresponding session connection has not yet been established or the session is not the active session on this port, the TD/SMP open session or select session command is sent. If opening a new session fails, the terminal reverts back to the previous session.

Comm Radio Buttons

Selecting Comm = session off completely disables the corresponding session virtual terminal such that it can no longer be made active, it is not included in the switch session cycle order, and its icon does not appear in the framed windows display. Resources previously assigned to this virtual terminal become available to the others. At least one session must always be enabled. The terminal does not allow "Comm = session off" to be set for the last remaining session. Notice that selecting "Comm = session off" does not dim the corresponding session selection in this dialog box.

Print Radio Buttons

This set of radio buttons control the printer port assignments. They are described below with the Printer Port Select dialog box. This same dialog box appears in both Communications and Printer Set-Up and affects all sessions. If comm3 is assigned as the printer port for one or more sessions, it is dimmed and is not available as a comm selection. Alternatively, if comm3 is assigned as the comm port for any session, it is dimmed and is not available as a printer port selection. The factory default is ‘‘Print=none’’ for all four sessions.

The Printer Port Select dialog box allows you to specify which port is to be used for local print operations: serial port comm3 or the Centronics parallel port. If more than one session is assigned to use a single printer port, the printer will be shared on a ﬁrst-come-ﬁrst- served basis. The Print Page operation and Printer Controller Mode can not be interrupted. If a session is using the printer for either of these, other sessions attempting to use this printer port are forced to wait (printer status: busy) until the previous operation completes. A session assigned "Print = none" will have "printer status: no printer". Any print operations attempted from this session will be ignored.

2.13.2 Word Size

The communication word size can be 8 bits (default) or 7 bits.

2.13.3 Parity

You can select any of the following parity checks:

      

2.13.4 Stop Bits

For communication, 1 (default) or 2 stop bits can be enabled.

None Even Odd Even, unchecked Odd, unchecked Mark Space

Set-Up 2–47

Set-Up

2.13 Communication Menu

2.13.5 Transmit Speed

The communication Transmit speed is set to 9600 baud. You can select transmit speeds from the menu shown in Figure 2–19.

Figure 2–19 Communication Transmit Speed Menu

2.13.6 Receive Speed

Like the communication Transmit speed, you can select the Receive speed from 300 to 115.2K baud. The default receive speed matches the transmit speed selection.

2.13.7 Transmit Flow Control

The Transmit ﬂow control method can be one of the following:



None



XON/XOFF



DSR (Data Send Ready)



Both

When an ASCII emulation is selected, the default Transmit ﬂow control is None.

Note

2–48 Set-Up

2.13.8 Receive Flow Control

The Receive ﬂow control method can be one of the following:



None



XON/XOFF or XPC



DTR (Data Transmit Ready)



Both

2.13.9 Flow Control Threshold

You can set the Flow control threshold to Low (64 characters) or to High (768 characters).

2.13.10 Transmit Rate Limit, Fkey Rate Limit

The Transmit rate limit choice limits the character rate from the keyboard to between 30 and 150 characters per second (selectable with fairly uniform separation), regardless of baud rate. This is fast enough to allow any keystroke to auto repeat at 30 Hz (baud rate permitting). The default is 150.

This feature allows you to limit the transmit rate from the terminal so as to reduce the interrupt burden on the operating system.

You can select a different transmit rate for graphic keys and function keys using Fkey rate limit. The F keys transmit more than 1 byte per key press. This function may be selected through the DECXRLM and DECTRL control function. Refer to Chapter 5, for details.

Set-Up

2.13 Communication Menu

Figure 2–20 Communication Fkey Rate Limit Menu

Set-Up 2–49

Set-Up

2.13 Communication Menu

2.13.11 Ignore Null Character

The Ignore Null setting causes the terminal to discard Null characters immediately without buffering them. This allows NUL to be used as a time ﬁll character to pace terminal output without overﬂowing the receive character buffer. To pass NUL control codes to a printer, you must deselect the Ignore Null character check box.

2.13.12 Local Echo

With Local echo enabled, most characters sent from the keyboard to the host are also displayed on the screen. The answerback message and XON/XOFFs are not echoed locally. Everything else is.

This feature corresponds to the SRM control function described in Chapter 5.

Local echo is different from the "Local" setting of On-line in the main menu of the Set-Up directory. Local echo causes keystrokes to be echoed on the screen, but it does not direct keyboard input to the ANSI parser, which also updates the screen. Local echo is temporarily disabled when the terminal is in either Local mode or Local Controller mode, because the keyboard input is already being redirected to the screen through the parser or to the printer.

Note

2.13.13 Half Duplex

You can enable or disable Half duplex communication. The default is disabled. Half duplex communication is available only on the Comm1 communications port. If communication is set for the Comm2 port, this feature is disabled (dimmed).

2.13.14 Auto Answerback

This item is used to enable or disable Auto answerback on power-up or upon connection. The factory default is disabled.

2.13.15 Answerback Message

Each session can have an answerback message. The Answerback message . . . menu item invokes a dialog box with a 30-character limit. All characters that can be generated by the keyboard are legal in this ﬁeld (including primary and secondary keyboard language characters). As such, no errors are reported, except when trying to enter more than 30 characters. In this case, the bell rings (if enabled), and no more characters are accepted. The factory default message is no message at all (a blank ﬁeld).

If an Answerback message is currently deﬁned, the message is displayed in the text entry area. The enter a new Answerback message.

Delete

key can then be used to delete backwards and

2–50 Set-Up

Figure 2–21 Communication Answerback Dialog Box

Set-Up

2.13 Communication Menu

Control characters are displayed using the CRM font. Pressing return character in the Answerback message. Pressing cursor in the Answerback text ﬁeld moves to the OK button.

The current Answerback message is displayed in the answerback dialog box unless Answerback concealed is selected. In this case, the previous Answerback message is not shown. Choosing the OK button to enter a new Answerback message clears the Answerback concealed check box.

2.13.16 Answerback Concealed

Changes to this ﬁeld take effect immediately. The factory default is disabled. If disabled, the Answerback message is visible in Set-Up. If enabled, the message

is not visible and the text "<concealed>" replaces the message. The only way to return this ﬁeld to disabled (visible) is to enter a new message.

Return

enters a

with the highlighting

Set-Up 2–51

Set-Up

2.14 Modem Menu

Figure 2–22 Modem Menu

2.14.1 Enable Modem Control

The ﬁeld allows you to select whether the additional hardware control signals at the interface connector are used for modem control. Modem control disabled is also referred to as "Data leads only." Refer to Chapter 9 for details on modem control signals.

This feature corresponds to DECMCM in Chapter 5.

2.14.2 Disconnect Delay

When modem control is enabled, the Disconnect delay feature determines the time allowed before the terminal disconnects from the communications line when the received line signal detect (RLSD) is lost. Disconnect delay is in effect only when RLSD (CD) is lost. If DSR is lost, the terminal performs a disconnect immediately. The following selections are available:



2 seconds



60 ms



No disconnect

All countries except the United Kingdom should use a delay of 2 seconds. The 60 ms delay is for use in the United Kingdom.

If the VT520 detects a loss of carrier and you selected No disconnect, the VT520 ignores RLSD (CD) after the beginning of the connection.

If you try to disconnect and reconnect the line, the VT520 checks to "see" if RLSD is asserted before granting the connection. Once it is connected, the terminal ignores the loss of carrier.

You can select disconnect delay through Set-Up or through control function DECDDT. Refer to Chapter 9 for details on the connect and disconnect process.

2–52 Set-Up

2.14.3 Modem High Speed

Figure 2–23 Modem High Speed Menu

Set-Up

2.14 Modem Menu

When modem control is enabled, the speed indicator signal (SI) from the modem may be used to select the communication rate. This feature sets the communication rate to be used when the speed indicator line is "on." Selecting Ignore causes the terminal to use its regular transmit and receive speeds as it would when modem control is disabled.

This feature can be invoked by DECSCS.

2.14.4 Modem Low Speed

These selections are the same as the modem high speed selections shown in Figure 2–23. When modem control is enabled, the speed indicator (SI) signal from the modem may be used to select the communication rate. This feature sets the communication rate to be used when the speed indicator line is "off." Selecting Ignore causes the terminal to use its regular transmit and receive speed as it would when modem control is disabled. This feature can be invoked by DECSCS.

Set-Up 2–53

Set-Up

2.15 Printer Menu

Figure 2–24 Printer Menu

Printer features shown in Figure 2–24 correspond to the control functions listed in Table 2–9. These functions are described in Chapter 5 and Chapter 10.

2.15.1 Port Select

The Port select menu is the same one that appears in the Communication menu (see Figure 2–18). It is displayed in both areas to be easy to ﬁnd whether you are selecting the printer port or the host port. Having a single feature avoids complex interactions between printer port and host port selections.

2.15.2 Print Mode

The Print mode menu allows you to select the printer operating mode as follows:

  

Normal Autoprint Controller

2–54 Set-Up

2.15 Printer Menu

Note

We recommend that you do not save the Controller mode selection in NVR because this may result in a "hung" terminal if the printer does not have DTR asserted.

Local echo is temporarily disabled when the terminal is in either Local mode or Local Controller mode, because the keyboard input is already being redirected to the screen through the parser or to the printer.

Table 2–9 Printer Features and Control Functions

Set-Up Feature Factory Default Host Control Code

Set-Up

Printer

Port select S1=comm1, S2=comm2,

Print=comm3 Print mode Normal MC Printer type DEC ANSI DECSPRTT DECSDPT DEC/ISO char sets National only DECSDPT PC character sets PC International (437) DECSPPCS

Same as receive Print extent Full page DECPEX Print terminator None DECPFF

———————————– Serial print speed 4800 baud DECSCS [ ] 2-way communication MC Transmit ﬂow control XON/XOFF DECSFC Receive ﬂow control XON/XOFF DECSFC Word size 8 bits DECSPP Parity None DECSPP Stop bits 1 bit DECSPP

DECSCP

2.15.3 Printer Type

You can select the printer type as follows:



DEC ANSI



IBM ProPrinter



DEC + IBM

2.15.4 Printer Character Sets

The printer character set menus allow you to match the characters printed to the character sets the printer is capable of supporting.

Set-Up 2–55

Set-Up

2.15 Printer Menu

2.15.4.1 DEC/ISO Character Sets

You can enable the character set categories shown in Figure 2–25.

Figure 2–25 DEC/ISO Character Sets Menu

2.15.4.2 PC Character Sets

The numbers in parentheses in this menu refer to standard PC code pages. Refer to Chapter 10 for a listing of the PC character sets.

Same as receive—Use IBM ProPrinter sequences with control codes or

without host control codes.

2.15.5 Print Extent

This selection allows you to print a full page or just the scroll region.

2.15.6 Print Terminator

The print terminator can be None or FF (form feed).

2.15.7 Serial Print Speed

Like the Communication menu speed selection (see Figure 2–19), you can select the serial printer speed from 300 to 115.2K baud. The default is 4800 baud.

2–56 Set-Up

Figure 2–26 PC Character Sets Menu

Set-Up

2.15 Printer Menu

2.15.8 2-Way Communication

This item allows you to enable and disable bidirectional communications on the serial printer port. The default is 2-way communication disabled.

2.15.9 Transmit Flow Control

The printer transmit ﬂow control method can be one of the following:



None



XON/XOFF



DSR (Data Send Ready)



Both

2.15.10 Receive Flow Control

The printer receive ﬂow control method can be one of the following:



None



XON/XOFF



DTR (Data Terminal Ready)



Both

2.15.11 Word Size

The printer word size can be 8 bits (default) or 7 bits.

Set-Up 2–57

Set-Up

2.15 Printer Menu

2.15.12 Parity

You can select any of the following parity checks to the printer:



None



Even



Odd



Mark



Space

2.15.13 Stop Bits

For the printer, 1 (default) or 2 stop bits can be enabled.

2.15.14 Same as Receive

This item allows you to set the transmit speed to be the same as the receive speed on the printer port.

2.16 Tabs . . .

The Tabs . . . menu item is used to invoke the Tab Set-Up dialog box, displaying a 132-column tab ruler. Figure 2–27 shows that tab stops are indicated by the letter T.

The highlighting cursor is initially displayed over the entire tab ﬁeld. The normal character cursor appears in column 1 of the tab ﬁeld.

(

The advances the cursor to the next tab stop in the tab ﬁeld (if any). The character cursor automatically wraps between the end of the ﬁrst row and the beginning of the second row in the tab ﬁeld.

and

)

keys move the cursor within the tab ﬁeld. Pressing

Tab

2–58 Set-Up

Figure 2–27 Tab Set-Up Dialog Box

Set-Up

2.16 Tabs . . .

2.17 Sound

The labeled buttons allow you to clear all tabs or to set 8-column tabs directly. To set individual tabs:

1. Position the cursor in the desired column.

2. Press

Enter

to set or clear a tab in that column.

Tab setting can also be invoked by the HTS and DECCTS control functions.

The VT520 is capable of producing a range of sound frequencies. Examples:

To communicate . . . Sound used

Power on 125 ms beep Attention warning (also ^G) 125 ms beep Programmable Alarm Four short beeps in rapid succession, pause 0.5

Sticky keys on Series of three rising notes (short beeps Eb Ab C) Sticky keys off Series of three falling notes (C Ab Eb) Hourly chime 125 ms beep Keyclick 2 ms beep Margin bell 125 ms beep

seconds repeat. Alarm 1 uses C. Alarm 2 uses Eb.

Set-Up 2–59

Set-Up

2.17 Sound

Pnote

1 C5 14 C#6 1047 2 C#5 15 D6 3 D5 16 D#6 4 D#5(Eb) 632 17 E6 5 E5 18 F6 6 F5 19 F#6 7 F#5 20 G6 8 G5 21 G#6 9 G#5 847 22 A6 10 A5 23 A#6 11 A#5 944 24 B6 12 B5 25 C7 13 C6

Note ~F (Hz)

Pnote

Note ~F (Hz)

There is no local sound editor or customize dialog box as the terminal’s sound capability is rather simple and does not justify sophisticated editing features. A control function is deﬁned to allow applications to generate custom sounds. The general form is

ESC [ Pvolume ; Pduration ; Pnote ;... FINAL

Where:

Pvolume speciﬁes the sound volume (0=off, 1-3=low, 4-7=high). Pduration speciﬁes the note duration in 1/32 of a second. Pnote;...Pnote speciﬁes one or more notes to sound at the speciﬁed volume and duration (0=silent, 1=Eb, 2=Ab, 3=Bb, 4=C). The ﬁnal characters of the sequence are ,~ (2/12 7/14).

The terminal’s sound buffer can store 16 notes of speciﬁed volume and duration. Additional sound controls are held in the communications input buffer invoking receive data ﬂow control as needed.

2–60 Set-Up

2.18 Set-Up Factory Defaults

Table 2–10 lists the default for the features in the Set-up Menu and their corresponding host control code if available.

Table 2–10 Set-Up Factory Defaults

Set-Up Feature Factory Default Host Control Code

Set-Up

Actions

Session

Display

Clear display ED Clear communications Reset this session DECSTR RIS Restore factory defaults

—————————– Clock DECLTOD Calculator Show character sets Banner message DECLBAN

Select session Session name DECSWT DECSIN Pages per session S1=3,S2=3 DECSPMA Save settings for all Restore settings for all Copy settings from Update session When available DECUS

Lines per screen 24, 25 or 26 DECSNLS

[ ] Auto resize DECARSM

Lines per page 24 lines x 3 pages DECSLPP

[ ] Review previous lines DECRPL

Columns per page 80 Columns DECCOLM

[/] Clear on change DECNCSM Status display Local status DECSSDT Scrolling mode Jump DECSCLM DECSSCLS Screen background Dark DECSCNM Cursor display Block DECSCUSR

[/] Blink

[/] Enable cursor DECTCEM Cursor coupling

[/] Vertical coupling DECVCCM

[/] Page coupling DECPCCM

(continued on next page)

Set-Up 2–61

Set-Up

2.18 Set-Up Factory Defaults

Table 2–10 (Cont.) Set-Up Factory Defaults

Set-Up Feature Factory Default Host Control Code

Cursor direction Left to right DECRLM Copy direction Left to right DECRLCM Zero 0 DECSZS [ ] Auto wrap DECAWM [ ] New line mode LNM [ ] Lock user preferences [ ] Show control characters CRM CRT saver 15 minutes DECCRTSM

[/] Host wake-up DECHWUM Energy saver 15 minutes DECEST [ ] Overscan DECOSCNM

[ ] Framed windows Screen alignment... DECALN

Color

Assign colors DECAC DECCTR Alternate text colors DECATC Deﬁne colors DECRSTS Select color map ANSI SGR color DECSTGLT SGR ASCII color mode Color Blink and Bold style Foreground DECBBSM Erase color Text background DECECM Reverse and Blank attributes [/] Intensity attributes

Terminal type

Emulation mode VT520... DECTME Terminal ID to host VT520 DECTID VT default char set ISO Latin-1 SCS PCTerm character set PC International (437) DECPCTERM [ ] 7-bit NRCS characters DECNRCM [/] Transmit 7-bit controls S7C1T

ASCII emulation

Data lines 24 Lines Pages 1 x Lines Attribute Char Write protect attributes

[ ] Blank

[ ] Underline

(mono model only)

(continued on next page)

2–62 Set-Up

2.18 Set-Up Factory Defaults

Table 2–10 (Cont.) Set-Up Factory Defaults

Set-Up Feature Factory Default Host Control Code

[ ] Reverse

[ ] Blink

[/] Dim [ ] Page edit Received CR [ ] Recognize DEL [/] Enhance [/] Autoscroll [ ] Autopage [/] Send ACK [ ] Answerback mode [/] TVI page-ﬂip [ ] Font load Block mode Conversation Block end US/CR

Set-Up

Keyboard

VT Keyboard language North American DECKBD PC Keyboard language North American DECKBD Deﬁne key... DECPFK DECPAK

DECUDK DECNUMLK DECCAPSLK DECKLHIM

DECLL Save key deﬁnitions Recall key deﬁnitions [ ] Lock key deﬁnitions DECPKA Caps lock function Caps Lock DECSLCK Keyclick volume High DECSKCV Warning bell volume High DECSWBV

Suppress repeated warnings Margin bell volume Off DECSMBV Keyboard encoding Character (ASCII) DECPCTERM Auto repeat Fast (30/sec) DECARM [ ] Data processing keys DECBUM [ ] Application cursor keys DECCKM [ ] Application keypad mode DECPAM DECKPNM [ ] Map PC keyboard to VT [ ] Ignore missing keyboard

(continued on next page)

Set-Up 2–63

Set-Up

2.18 Set-Up Factory Defaults

Table 2–10 (Cont.) Set-Up Factory Defaults

Set-Up Feature Factory Default Host Control Code

Communication

Port select S1=comm1, S2=comm2,

Word size 8 bits DECSPP Parity None DECSPP Stop bits 1 bit DECSPP Transmit speed 9600 DECSCS Receive speed Transmit speed DECSCS Transmit ﬂow control XON/XOFF DECSFC Receive ﬂow control XON/XOFF or XPC DECSFC Flow control threshold Low (64) Transmit rate limit 150 cps DECXRLM DECSTRL Fkey rate limit 150 cps DECSTRL [/] Ignore Null character DECNULM [ ] Local echo SRM [ ] Half duplex DECCHDPXM [ ] Auto answerback Answerback message... DECLANS [ ] Answerback concealed DECCANSM

DECSCP

Print=comm3

Modem

Printer

[ ] Enable modem control DECMCM Disconnect delay 2 seconds DECSDDT Modem high speed Ignore Modem low speed Ignore

Port select S1=comm1, S2=comm2,

Print=comm3 Print mode Normal MC Printer type DEC ANSI DECSPRTT DECSDPT DEC/ISO char sets National only DECSDPT PC character sets PC International (437) DECSPPCS

Same as receive Print extent Full page DECPEX Print terminator None DECPFF

—————————–

Serial print speed 4800 baud DECSCS

DECSCP

(continued on next page)

2–64 Set-Up

2.18 Set-Up Factory Defaults

Table 2–10 (Cont.) Set-Up Factory Defaults

Set-Up Feature Factory Default Host Control Code

[ ] 2-way communication MC Transmit ﬂow control XON/XOFF DECSFC Receive ﬂow control XON/XOFF DECSFC Word size 8 bits DECSPP Parity None DECSPP Stop bits 1 bit DECSPP

Tabs... Set-Up language

[/] On-line Save settings Restore settings Exit set-Up

—————————–

DECST8C HTS

English DECSSL

Set-Up

Set-Up 2–65

3.1 Introduction

To enhance productivity, the VT520 provides local desktop features that can be used at any time the terminal is powered up, even when the terminal is not connected to a host. These features are:

• Calculator

• Clock

• Show character sets

• Banner message

• Copy and paste This chapter describes these desktop features and their interaction with the

terminal.

3.2 Invoking Desktop Features

Overview

The local functions can be accessed through Set-Up or through a userprogrammable key combination. Chapter 2, Set-Up, describes how to invoke these desktop features and how to assign a key combination to a speciﬁc feature. When one is invoked, the screen is partially obscured by that feature. Pressing

Ctrl/Z,F10(Exit

screen contents.

), or

ESC

exits the current desktop feature and reveals the entire

Desktop Features

From the Actions menu, you can invoke Clock, Calculator, Show character sets and the Banner message. When the feature is highlighted (displayed in

reverse video), press of some keyboard features is provided, as well as how to implement the Copy and Paste function. You can copy and paste within a session and between sessions.

Enter

Return

to enable the feature. A quick start summary

Desktop Features 3–1

Desktop Features

CtrlZ,F10,Exit

, or

Esc

to exit the feature.

3.3 Calculator

You can enable the Calculator function in Set-Up by pressing

Caps Lock Alt/F12

if you are not in an ASCII emulation mode. When you select the Calculator function, the terminal displays a simple

calculator. See the leftmost layout in Figures 3–1 and 3–2. The keypad keys map directly to the calculator keys. The layout depends on whether a VT or Enhanced PC keyboard is attached, and whether a modiﬁer key (

ShiftorAlt

) is currently

held down. When a keypad key is pressed, the corresponding key is highlighted (shown

in reverse video) on the screen. If a modiﬁer key is pressed down, the display changes to show the new keypad assignment. See the two rightmost layouts in Figures 3–1 and 3–2. All keys not associated with the calculator are ignored.

3–2 Desktop Features

3.2 Invoking Desktop Features

While these desktop features are enabled, other terminal functions are disabled. Press

MA049193.GRA

Digital Equipment VT520, VT525 Programming Manual

Specifications and Main Features

Frequently Asked Questions

User Manual