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AT-T 7400B
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Lucent Technologies AT-T 7400B User Manual

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AT&T 7400B Data Module
User’s Guide
555-020-707 Issue 1 November 1989
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FCC Notice:
AT&T Customer Information Center 2855 North Franklin Road P.O. Box 19901 Indianapolis, Indiana 46219
Document No. 555-020-707 Issue 1, November 1989
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
While reasonable efforts were made to ensure that the information in this document was complete and accurate at the time of printing, AT&T can assume no responsibility for any errors.
Changes or corrections to the information contained in this document may be incorporated into future reissues.
DEFINITY is a trademark of AT&T. Hayes is a registered trademark and Smartmodem is a trademark of Hayes Microcomputer Products, Inc. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. PROCOMM is a registered trademark of Datastorm Technologies, Inc. RELAY GOLD is a registered trademark of Relay Communications, Inc. CROSSTALK is a registered trademark of Digital Communications Associates. CompuServe is a registered trademark of H&R Block. Delphi is a registered trademark of Delphi Systems, Inc. Dow Jones News is a registered trademark of Dow Jones & Company, Inc. LEXIS/NEXIS are registered trademarks of Mead Data Central, Inc. Newsnet is a registered trademark of Newsnet, Inc. Official Airline Guide is a registered trademark of the Reuben H. Donnelley Corporation.
Copyright© 1989 AT&T
All Rights Reserved
Printed in U.S.A.
CONTENTS
PREFACE: ABOUT THIS GUIDE
Typographical Conventions Organization of This Guide Related Documentation
1
CHAPTER 1: INTRODUCTION
External Features
2
CHAPTER 2: INSTALLATION
Hardware and Software Requirements Hardware Installation Initial System Checks If You Are Using a PC If You Are Using a Dedicated Terminal
3
CHAPTER 3: FIRST TIME USERS
Operating Modes Essential AT Commands Sample Command Lines A Sample On-Line Session
i i ii
1-2
2-1 2-7 2-12 2-12 2-12
3-1 3-2 3-4 3-6
4
CHAPTER 4: OPERATION AND CONFIGURATION
CONFIGURATION PARAMETERS Operating Modes Issuing Commands From Data Mode to Command Mode and Back Dialing a Number Repeating a Command Storing a Telephone Number Automatic Answering Remote Site Use RESET AND CONFIGURATION RECALL
4-1 4-2 4-3 4-6 4-6 4-7 4-7 4-8
4-9 4-9
5
CHAPTER 5: TROUBLESHOOTING
How to Use This Chapter
A
APPENDIX A: AT COMMAND SET
B
APPENDIX B: S-REGISTERS
C
APPENDIX C: APPLICATION NOTES
PBX Application Notes PC Applications Guide Procomm Plus Relay Gold Crosstalk XVI
D
APPENDIX D: QUICK-REFERENCE SUMMARIES
GL
GLOSSARY
5-1
C-1 C-1 C-2 C-5 C-8
DEFINITY Communications System 7400B Data Module User’s Guide

PREFACE: ABOUT THIS GUIDE

PREFACE: ABOUT THIS GUIDE
Page i
The purpose of this guide is to provide information for installing, operating, and maintaining the 7400B Data Module.

TYPOGRAPHICAL CONVENTIONS

Throughout this guide, command lines that you type are shown in typewriter-style characters, and responses that the 7400B Data Module returns are shown in italics. The following is an example.
at h
[ Enter ]
OK
Note the following characteristics of the display representation:
The first line is a command line as it should be typed. The [ Enter ]
●
symbol, when shown, indicates that you must press the Enter or Return key to complete the command line.
●
Spaces are used to separate commands in some examples shown in this guide. In actual use, the spaces may be typed, but they are not
required.
●
The second line in the example shows a typical response returned by the data module.
ORGANIZATION OF THIS
The following paragraphs summarize the chapters and appendices
GUIDE contained in this guide.
Chapter 1: Introduction. Discusses the basic operating features of the AT&T 7400B Data Module and describes the external indicators and connectors.
Chapter 2: Installation. Describes the hardware and software required for installing the data module, and outlines procedures for preparing the data module for operation.
Chapter 3: First Time Users. Provides some basics on 7400B Data Module operation, describes how to use a few AT commands that are essential for most data communications operations, and then outlines a typical on-line session.
Chapter 4: Operation and Configuration. Describes how to change, store, and recall configuration parameters, outlines how to create and save custom, configuration profiles, and discusses more advanced command usage with example command lines.
PREFACE: ABOUT THIS GUIDE
Page ii User’s Guide
DEFINITY Communications System
7400B Data Module
Chapter 5: Troubleshooting. Describes procedures for troubleshooting problems that may be encountered while configuring and operating the 7400B Data Module.
Appendix A: AT Command Set. Contains an explanation of each AT command accepted by the 7400B Data Module.
Appendix B: S-Registers. Contains an explanation of each S­register used by the 7400B Data Module.
Appendix C: Application Notes. Contains notes on how to configure some popular PC data communications software packages for use with the 7400B Data Module, and provides a list of application notes that describe how to administer specific AT&T PBX systems for using the data module.
Appendix D: Quick-Reference Summaries. Contains quick­reference summaries of AT commands, S-registers, result codes, factory-default configuration settings, EIA-232-D connector pin-
outs, ASCII character set.

RELATED DOCUMENTATION

A glossary and an index are provided at the rear of this guide.
The following is a list of other manuals that may provide helpful information while installing and using the 7400B Data Module. Since each user may have different equipment and software preferences or availability, only generic titles are given for the manuals.
If you are using a terminal device other than a PC:
User's guide for your terminal device. You may need information about the configuration and capabilities of your terminal device from this manual during the installation and preliminary operation
of the 7400B Data Module.
If you are using a PC as your terminal:
User’s guide for Microsoft® MS-DOS®. You may need this reference for explanations of commands used by your PC to install, configure, and run your data communications software.
User's guide for your data communications software. You may need this guide for information on how to configure your terminal emulation software to access the 7400B Data Module.
DEFINITY Communications System CHAPTER 1: INTRODUCTION 7400B Data Module User’s Guide
Page 1-1
CHAPTER 1: INTRODUCTION
This chapter discusses the basic operating features of the 7400B Data Module and describes the external indicators and connectors.
The data module provides an asynchronous data service link between a Data Terminal Equipment (DTE) device and the following AT&T digital PBX equipment:
●
DEFINITY™ Communications System Generic 1
●
DEFINITY Communications System Generic 2
●
System 75
●
System 85
Note:
Unless a specific DTE device is intended, the words terminal device shall be used throughout this guide to represent any
applicable DTE device, including a dumb terminal, a printer, a plotter, or a personal computer (PC) with an appropriate data communications software package.
An EIA-232-D standard interface (formerly EIA recommended standard RS-232-C) connects the terminal device to the 7400B Data Module, and a standard Digital Communications Protocol (DCP) interface (using a type D8W modular telephone cord) connects the data module to the digital PBX.
An internal DIP-switch option allows the 7400B Data Module to be set for use either with or without a telephone. In without-telephone mode, the data module supports data service only, but in with-telephone mode the data module provides simultaneous data and voice service (requires an associated AT&T 7400-series DCP digital voice terminal).
Note:
If a 7400-series voice terminal with data features is used with the 7400B Data Module, data service is provided by the 7400B Data Module and the data features of the voice terminal cannot be used.
The 7400B Data Module uses a subset of the industry-standard AT command set and supports transmission speeds of 300, 1200, 2400, 4800, 9600, and 19,200 bps.
Additional features of the 7400B Data Module, described in later chapters of this manual, include:
●
non-volatile, read-write memory for storing two data options profiles and up to four telephone numbers
●
automatic speed and parity adjustment
CHAPTER 1: INTRODUCTION
Page 1-2
●
data metering option
●
programmable control characters
●
self-test at start-up
●
local and remote loopback tests
●
test duration timers
●
voice terminal powered by the PBX is not affected if ac power
DEFINITY Communications System
7400B Data Module
User’s Guide
is removed from the 7400B Data Module

EXTERNAL FEATURES The external features of the front and rear panels of the 7400B Data

Module and the separate power supply unit are described in this section. The data module has a removable access panel on top of the unit, which is described further in the hardware installation section of Chapter 2, “Installation.”

Front Panel

The front panel of the 7400B Data Module is shown in Figure 1-1, and the 10 LEDs on the front panel are described in Table 1-1. In addition to providing indications for normal operating modes, all of the LEDs are also used as status indicators when the 7400B Data Module is first powered on and the internal self-test is running.
Figure 1-1. Front Panel
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 1: INTRODUCTION
Page 1-3
Connector
POWER/ TEST
DATA METERING
AA
CD
RD
SD
TR
OH
Description
This red LED lights as long as power is applied to the data module. This LED flashes during any test mode, except the start-up self-test. It also flashes along with the DATA LED if the connection with the PBX is lost.
This red LED lights to indicate the state of the CTS (Clear To Send) output lead when the Data Metering option is enabled.
Automatic Answer. This red LED flashes to indicate an incoming call and lights continuously when the data module is operating in Automatic Answer mode.
Carrier Detect. This red LED lights as long as communication is established with the far end device.
Receive Data. This red LED lights when received data is being transferred from the 7400B Data Module to the local terminal device.
Send Data. This red LED lights when transmitted data is being transferred from the local terminal device to the 7400B Data Module.
Terminal Ready. If the &d0 option is enabled, the red LED is on continuously; if either the &d1 or &d2 option is enabled, this LED indicates the state of the DTR lead (see description of &d command in Appendix A).
Off Hook. This red LED lights continuously from the time a data
communications call is initiated until the call is terminated.
CHECK SPEED
This red LED lights when a call set up fails because of an incompatibility between the configuration of the local terminal device and the far end device. The incompatibility will usually occur if a common operating speed cannot be
achieved between the two endpoints. Chapter 5, “Troubleshooting,” provides
information about this and other conditions that may cause this LED to light.
DATA
This green LED lights to indicate that a data call is in progress. This LED
flashes along with the POWER/TEST LED if the connection with the PBX is
lost.
TABLE 1-1 Front Panel LED Indicator Descriptions
CHAPTER 1: INTRODUCTION DEFINITY Communications System
7400B Data Module
Page 1-4 User's Guide

Rear Panel

The rear panel of the 7400B Data Module is shown in Figure 1-2, and the connectors located on the rear panel are described in Table 1-2.
Figure 1-2. Rear Panel
Connector Description
PHONE
This connector accepts one end of the D8W telephone line cord used to connect a telephone or voice terminal to the data module.
LINE This connector accepts one end of the D8W telephone cord that connects
between the data module and the PBX wall jack.
POWER
This connector accepts the output cable of the separate power supply unit used with the 7400B Data Module.
PORT 1 This connector accepts a male plug from the EIA-232-D (or RS-232-C) cable
that connects between the data module and the terminal device.
PORT 2
Not used by the 7400B Data Module.
TABLE 1-2 Rear Panel Connector Descriptions
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 1: INTRODUCTION
Page 1-5

Power Supply Unit

A separate power supply unit is required with the 7400B Data Module. This unit connects between a grounded AC outlet and the “POWER” connector at the rear of the data module. This power supply unit provides the necessary operating voltages for the data module.
Caution:
Make certain that the AC outlet to which you connect the power supply is unswitched (for example, not controlled by a wall switch or light dimmer).
Instructions for installing the power supply unit with an illustration are provided in the hardware installation section of Chapter 2, "Installation."
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 2: INSTALLATION
Page 2-1
CHAPTER 2: INSTALLATION
This chapter describes the hardware and software required for installing the data module, and outlines procedures for preparing the data module for operation.

HARDWARE AND SOFTWARE REQUIREMENTS

In addition to the 7400B Data Module and the required separate power supply, you will need the following items:
●
an asynchronous data terminal device or a personal computer (PC) with data communications software
●
an EIA-232-D interface (formerly RS-232-C) cable to connect between the terminal device and the data module
●
a type D8W telephone cord for Data Communications Protocol (DCP) connection between the Data Module “LINE” jack and the PBX wall jack
●
(optional) an AT&T 7400-series DCP digital voice terminal (and associated adjunct equipment, if applicable)
●
(optional) a second type D8W cord to connect between the data module “PHONE” jack and optional voice terminal (you may need an adjunct power supply, adapter, and D6AP cord, as applicable)
Figure 2-1 illustrates the needed hardware items for an arrangement without a telephone, Figure 2-2 shows the set up for using a telephone without adjunct equipment, and Figure 2-3 shows a similar setup with some typical adjunct equipment.
CHAPTER 2: INSTALLATION
Page 2-2
DEFINITY Communications System
7400B Data Module
User’s Guide
PERSONAL
COMPUTER
PBX
WALL
JACK
D8W CORD
7400B DATA
MODULE
EIA CABLE
POWER SUPPLY
Figure 2-1. Typical Standalone Installation
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 2: INSTALLATION
Page 2-3
Figure 2-2. Typical Installation with Telephone
CHAPTER 2: INSTALLATION
Page 2-4
DEFINITY Communications System
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User’s Guide
Figure 2-3. Typical Installation with Telephone
and Adjunct Equipment Requiring Auxiliary Power
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 2: INSTALLATION
Page 2-5

About the Terminal Device The 7400B Data Module operates with any asynchronous data terminal

device that has an EIA-232-D (or RS-232-C) serial port connector. If you are using a PC as your terminal, you will need a suitable data communications software package.
Also, you must set the appropriate configuration options before connecting the 7400B Data Module to a printer or plotter. To do this, connect a data terminal or PC to Port 1 of the data module, change the necessary configuration parameters, remove the data terminal or PC, and then connect the printer of plotter. The configuration parameters used for this type of operation are described in Chapter 4, "Operation and
Configuration," in a section titled “Remote Site Use.”
EIA-232-D cables and data communications software packages are described in the following paragraphs.

Selecting an EIA-232-D Cable

Selecting Data Communications Software

Select an EIA-232-D with a male connector at one end to mate with the Port 1 connector of the 7400B Data Module, and a connector of the appropriate "gender" at the other end to mate with the communications port of your terminal device.
Note:
Cables with the earlier RS-232-C designation will also work.
The most common EIA-232-D cables are supplied with a male connector at both ends. If you have this type of cable and the EIA-232­D port on your terminal device is a male connector, you can use a cable adapter commonly referred to as a “gender changer”. Otherwise, obtain an EIA-232-D cable that has the appropriate gender connector at each end to fit your application needs.
The purpose of data communications software is to allow your PC to operate as an asynchronous data communications terminal. Of the many software packages available, all perform essentially the same functions, but often in significantly different ways.
If you do not already have a communications software package, consult with an experienced user for advice on selecting software to suit your data communications needs. The following, though not required, are a few helpful features that you may wish to look for in the software you select:
●
Terminal mode. Also called local mode or chat mode, this
feature allows you to issue commands to the 7400B Data Module. The software that you select must have some form of terminal mode.
●
Dialing directory. This feature allows you to store several frequently called numbers, often along with configuration of the data options needed for completing the connection.
CHAPTER 2: INSTALLATION
Page 2-6
DEFINITY Communications System
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User’s Guide
●
Predefine data options profiles. Some programs include completely defined data option profiles (also called
configuration profiles) for popular modems. If available, select the options profile for the Hayes® Smartmodem 2400™.
●
Command files. These files, also called script files, allow you to define a group of commands that may be executed for automatically logging into specific remote devices.
Appendix C, “Application Notes,” provides guidelines for using a few of the more popular communications software packages with the 7400B Data Module.

Selecting DCP Cords

Selecting DIP-Switch Options

The 7400B Data Module is supplied with a 5-foot D8W cord. Use this, or obtain the appropriate length D8W telephone cord for DCP connection between the 7400B Data Module and the PBX wall jack. If you are using the with-telephone option, you will need a second D8W telephone cord to connect between the data module and your telephone or voice terminal.
Three hardware options may be selected by setting switches on an internal 8-position DIP switch (SW1). These options are described here, and procedures for setting the switches are provided in a later section titled “Setting the Hardware Option DIP Switches.”
With/Without Telephone Option (SW1-1)
When this option is set for operation without an associated telephone (SW- 1 set to " WITHOUT PHONE"), the 7400B Data Module offers only data service between a terminal device and a remote system. Setting this option for operation with an associated voice terminal (SW­1 is set to “WITH PHONE”) enables simultaneous data and voice service over the same line from the PBX.
When the 7400B Data Module is optioned for “WITH PHONE,” an AT&T 7400-series DCP digital voice terminal is connected to the data module only for its voice service features; data service is provided directly from the 7400B Data Module, and any data features that the voice terminal may offer cannot be used.
Note:
A change in the setting of this option becomes effective when the data module is powered on after being powered off. The setting of this option cannot be changed arbitrarily—it must agree with how the line is administered at the PBX. For information on how to administer the 7400B Data Module at the PBX for use with or without a telephone, refer to Appendix C, “Application Notes.”
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 2: INSTALLATION
Page 2-7
Data Metering Option (SW1-5)
When the data metering option is disabled (SW1-5 set to "OFF"), the transfer speed of the 7400B Data Module will adjust to match the transfer speed of the remote system. The C0NNECT xxxx message displayed when a connection is completed will always indicate the far end speed.
When this option is enabled (SW1-5 set to "ON"), it allows the user to set-up a call to a remote end device that is running at a lower speed than the local data module. The CONNECT xxxx message will always indicate the speed of the local data transfer. The data module performs the speed conversion and uses the CTS lead to flow-control the user’s terminal if it is sending too much data too fast. During the data transfer, the DATA METERING LED indicates the state of the CTS lead.
Note:
If you are using a PC with a data communications package,
or a dedicated terminal that does not support CTS control,
you cannot make file transfers with the data metering option
enabled.
A change in the setting of this option becomes effective immediately when the data module is in the idle mode or as soon as it is returned to the idle mode. The data module is in idle mode any time that it is not in test mode or connected to an active data call.
Make Busy on Local Loop Option (SW1-8)
This option controls the make-busy feature of the 7400B Data Module.
When the option is enabled (SW1-8 set to "ON"), the data module will busyout the DCP line when either the Local Loopback or Local Loopback/Self-Test mode is entered. The busyout condition is released when the test ends.
Note: A change in the setting of this option becomes effective
immediately when the data module is in the idle mode or as
soon as it is returned to the idle mode. The data module is in idle mode any time that it is not connected to an active data call.

HARDWARE INSTALLATION

This section outlines procedures for setting the hardware options DIP switches on the Data Module, connecting the EIA-232-D cable, installing the power supply, and connecting the D8W telephone cord(s).
Caution:
To avoid possible shock hazards and damage to the equipment, you should perform the installation steps in the order given.
CHAPTER 2: INSTALLATION
Page 2-8
DEFINITY Communications System
7400B Data Module
User’s Guide
Setting the Hardware
Three hardware options are selected by setting switches on an internal
Option DIP Switches 8-position DIP switch. Setting these switches is described in the
following paragraph; however, for more information about using these options, refer to Chapter 4, “Operation and Configuration.”
Note:
The factory-default settings of these switches are correct for the vast majority of applications. Check the default settings shown in Table 2-1 to determine whether you need to make any changes.
Telephone
SW1-1
Without Phone ON With Phone OFF
(factory-default)
Data Metering
SW1-5
On—enabled ON
Off—disabled
OFF
(factory-default)
Busy Out on Local Loop SW1-8
On—enabled Off—disabled
ON OFF
(factory-default)
TABLE 2-1 Option DIP Switch Settings
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CHAPTER 2: INSTALLATION
Page 2-9
To access and set the hardware option switches, refer to Figure 2-4 and perform the following:
Figure 2-4. Accessing the Hardware Option Switches
CHAPTER 2: INSTALLATION
Page 2-10
DEFINITY Communications System
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User’s Guide
Caution:
Disconnect all cables and telephone cords attached at the rear of the unit. Failure to disconnect all cables and
cords at this point could result in permanent damage to
the 7400B Data Module.
Remove the top access panel of the data module as follows:
1. While applying a gentle lifting pressure at the rear edge of
a.
the access panel, insert the tip of a ball-point pen or other suitable device into each of the two tab-lock holes in the rear panel to release the locking tabs.
b.
Lift and remove the access panel.
If a ROM board is installed just inside the access opening of the
2.
Data Module, grasp the edges of the ROM board inside the access opening and lift the board out of its socket.
Locate the 8-position DIP switch on the main circuit board,
3.
approximately in the center of the area exposed by the access opening.
4.
Set the appropriate positions of this DIP switch as shown in the Table 2-1.
If a ROM board was removed in step 2, reinsert the board into its
5.
connector.

Connecting the EIA-232-D Cable

Replace the access panel by placing it into position and pressing
6.
down at the rear edge to engage the locking tabs.
Connect the EIA-232-D cable between the Data Module and the terminal device as follows:
Insert a male connector of the EIA-232-D cable into the connector
1.
labeled PORT 1 on the rear panel of the Data Module. Tighten both connector retaining screws.
2.
Insert the other end of the EIA-232-D cable into the
communications port connector on the terminal device. Tighten all retaining screws.
Note:
Be sure to attach any required adapter as discussed previously in the paragraphs titled "Selecting the
EIA-232-D Cable."
DEFINITY Communications System 7400B Data Module User’s Guide Page 2-11
CHAPTER 2: INSTALLATION

Connecting the DCP Cord Attach the DCP type D8W telephone cord as follows:

1.
Insert either end of the telephone cord into the connector on the rear panel of the Data Module labeled LINE.
2.
Insert the other end of the telephone cord into the PBX wall jack.
3.
If you are using the with-phone option of the 7400B Data Module (voice and data), install the second D8W telephone cord as follows:
a.
Insert one end of the second D8W cord into the jack on your 7400-series DCP voice terminal.
Insert the other end of the second D8W cord into the jack on
b.
the rear panel of the Data Module labeled PHONE.
Connecting the Power
Connect the separate power supply unit to the 7400B Data Module as
supply follows:
1.
2.
Note:
An internal DIP-switch must be set correctly for this option to work (see "Setting the Hardware Option Switches" in this chapter). Also, if your voice terminal has data capabilities, the data features of the voice terminal are not supported while it is connected to the 7400B Data Module.
Insert the output connector of the power supply into the connector on the rear panel of the Data Module labeled “POWER.”
Caution:
Be sure that the side of the power supply cable connector labeled “TOP” is facing upward before inserting the connector.
Insert the AC connector of the power supply unit into an appropriate AC outlet.
Note:
Since the 7400B Data Module does not have a power on/off switch, the unit will power on as soon as the power supply is connected to an active AC line.
Caution:
Make certain that the AC outlet to which you connect the power supply is unswitched (for example, not controlled by a wall switch or light dimmer).
CHAPTER 2: INSTALLATION DEFINITY Communications System
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User’s Guide

INITIAL SYSTEM CHECKS This section describes procedures for initially checking out your

hardware and any required software. It is assumed at this point that your hardware and data communications software have been properly installed and are ready for use.
Note:
Data communications software is required only if you are using a PC as your terminal device. A dedicated data terminal does not need data communications software.

Power-Up Self-Test When power is first applied to the 7400B Data Module, the unit

performs a self-test to determine that it is in working order. The progression of the self-test is indicated by the sequential, left-to-right lighting of the 10 front-panel LEDs.
If the self-test finds no problems, the LEDs labeled POWER/TEST and TR will remain lit and all other LED lamps will go out.
Note:
The operation of the LEDs described here assumes that the factory-default options are still in effect. Once certain options have been changed, the operation of the LEDs may differ from this description.
Your 7400B Data Module is now installed and ready for data
communications operation.

IF YOU ARE USING A PC Review the documentation for your PC and data communications

software. Be sure that you understand both well enough to get the software running and place your PC in terminal mode.

IF YOU ARE USING A DEDICATED TERMINAL

Since there is such a diversity of functionality among the many packages available, refer to the user’s manual of the software package
for specific details of its use. Appendix C, “Application Notes” provides guidelines for using a few of the more popular packages with
the 7400B Data Module.
To determine whether your terminal is communicating with the 7400B Data Module, type the following command line:
AT
[ Enter ]
Note:
The two characters of the “AT” command prefix must be typed as either both uppercase or both lowercase. That is, you can type either at or AT, but At or aT will not work.
If everything is operating properly, the command should appear on the screen as you type it, and the 7400B Data Module should respond with
OK. Refer to Chapter 5,“Troubleshooting,” for help if you are not getting these results.
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 3: FIRST TIME USERS
CHAPTER 3: FIRST TIME USERS
Page 3-1
This chapter provides some basics on 7400B Data Module operation, describes how to use a few AT commands that are essential for most data communications operations, and then outlines a typical on-line session.

OPERATING MODES

Character Formats

Note:
The commands for the data module are referred to as AT commands because you must type the letters “AT” as the first characters on the line for most commands.
Except when the 7400B Data Module is in a test mode, it is always in one of two distinct operating states or modes: command mode and on- line or data mode.
In command mode, the data module tries to interpret everything you
type on your keyboard as a command. In on-line mode, the data module passes everything on as data.
While in on-line mode, typing a specific character three times in quick succession (the factory-default escape sequence is 3 plus signs, or +++) causes the data module to go into command mode without disconnecting an active data call.
The operating modes, the escape sequence, and several AT commands are explained further in Chapter 4, “Operation and Configuration.” All AT commands are described fully in Appendix A, “AT Commands.”
In this context, character format refers to the form a character may take locally, between the 7400B Data Module and your terminal device. The elements that make up character format are often referred to as communication parameters. Formats supported by the 7400B Data Module are shown in Table 3-1.
Data Bits
Parity Stop Bits
7 even or odd
7 8
mark or space none
TABLE 3-1 CHARACTER FORMATS
1 1 1
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All of these parameters may be changed on the local terminal device as needed. The 7400B Data Module will adjust to match the speed and parity of the local terminal device.
If you connect to a remote system and your screen shows a series of nonsense characters (also referred to as "garbage"), chances are that you
need to adjust speed or parity. For more information on configuration, see Chapter 4, “Operation and
Configuration.”

ESSENTIAL AT COMMANDS

Note: This section pertains mostly to dedicated terminals, since
many data communications packages for PCs may not allow you to send AT commands directly to the data module.
This section provides a basic description of the most commonly used AT commands. These few commands are all you will need for completing many data communications tasks. In a later section titled “Sample On-Line Session,” presented at the end of this chapter, you will enter the commands manually from your terminal keyboard.
Note:
If you are using a PC with software that permits command or script files, you may create files to perform automatic log in for devices that you plan to communicate with frequently. In this case, the commands used are typically not direct AT commands, but function commands defined by the software package. For more information on PC software, refer to Appendix C, “Application Notes.”
Table 3-2 describes the subset of AT commands you will need for the on-line session at the end of this chapter. For a complete description of all AT commands, refer to Appendix A.
Note:
Except where otherwise noted, press
AT
command lines.
[ Enter ]
to complete all
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AT Command
AT
D
A/
Description
The command prefix that must be typed as the first two letters of all AT commands except +++ and A/. This prefix gets the
AT
tention of the data module.
Note:
The characters of the AT prefix must both be typed in either uppercase or lowercase letters (AT or at will work, but At or aT will not). Typing a space between the AT prefix and the next command on the line is optional, but do not separate the two letters “AT” with a space.
The Dial command. This command follows the AT and precedes the number that you wish your data module to dial. For example:
atd71204
Note:
[ Enter ]
Other commands may precede the D command, but any characters following it will be interpreted as part of the number that is to be dialed.
The redo or Again command. This is one of the two commands that does not require the AT prefix. To repeat the previous command line exactly, type A/ without pressing [ Enter
].
(more)
TABLE 3-2 AT Command Subset
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AT Command
+++
O
H
Description
The escape character sequence. This is one of the two commands that does not require the AT prefix. Once you have connected to the remote device, your data module assumes the on-line mode of operation. If you need to return to the command mode, leave the keyboard idle for at least one second, and then type +++ without pressing
[ Enter ].
Within a few seconds, the data module
will respond with OK, signifying that it has entered the command mode and is waiting for you to type a command.
Whether OK is returned or not depends on the setting of certain parameters. If the factory-default settings are in effect, OK should be returned.
The return to On-line command. After using the +++ escape sequence to enter command mode, you can type
ato
and press
Note:
[ Enter ]
to return to on-line mode.
This command will not work if you have disconnected the data call.
The hang up or disconnect command. After using the +++ escape sequence to enter command mode, you can type
ath
and press
[ Enter ]
to disconnect the data call.
&F
The return to Factory-default settings command. If an experimental change of your data module settings produces unexpected results — and you are not sure how to get out of the fix — type
AT&F
and press
[ Enter ].
This will return all configuration parameters back to the factory-default settings.
TABLE 3-2 AT Command Subset (Contd.)

SAMPLE COMMAND LINES This section presents a few sample AT command lines with

explanations of the results they will produce. EXAMPLE 1: Dialing a number.
at d 5551212
[ Enter ]
CONNECT 2400
DEFINITY Communications System 7400B Data Module User’s Guide
EXAMPLE 2: Dialing a telephone number outside your PBX domain with a few other options thrown in.
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In the first line of this example,
●
AT is the required command prefix,
●
D is the dial command,
●
and the remainder of the line is the telephone number.
Note: The spaces between the commands and the telephone
number are included only for readability and are not required. You may also insert hyphens (-) anywhere in the telephone number for increased readability.
In the second line of this example, the data module returns a response indicating that a connection with the remote end device has been successfully completed at 2400 bps.
at &f d 9-555-1212
[ Enter ]
BUSY
In the first line of this example,
at
is the required command prefix,
●
●
&f tells the data module to restore the factory-default configuration
parameters,
●
d
is the dial command,
●
9 represents the access code required to dial a number outside your PBX domain,
●
and the remainder of the line is the telephone number.
In the second line of this example, the data module indicates that it detected a busy signal.
EXAMPLE 3: Using a time saver.
A/
The A/ command tells the data module to repeat the last command line exactly. If, as in the previous example, you had issued the command to dial a number and the data module returned the message BUSY, you could type the
A/
command to try the number again.
Note:
The A/ command must be the only command on the command line, and you do
not
press
[ Enter ]
to complete the line.
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EXAMPLE 4: Changing data options.

A SAMPLE ON-LINE SESSION

Starting the Session

at el &d2 s0=5
[ Enter ]
This command line is a command sequence that sets up the 7400B Data Module to automatically answer incoming calls. The commands set the following parameters:
●
AT is the required command prefix,
●
e1 causes characters entered from the keyboard to be echoed to the screen while in command mode
●
&d2 causes the data module to hang up the call when the local terminal turns off DTR
●
s0=5 causes the data module to enter automatic answer mode and answer incoming calls on the fifth ring.
This section outlines how to perform a simple on-line session using the AT commands described in this chapter. For more information about all AT commands, see Chapter 4, "Operation and Configuration" and Appendix A, “AT Command Set.”
The following is a sample data call to a fictitious bulletin board service. If you know the number of a "real" bulletin board service, you might try an actual log on by using that number and following the suggestions in this session.

Possible Display Problems

at d 9-555-7575
[ Enter ]
CONNECT 1200
The D command is used to dial the number of the bulletin board. Since the connection was made successfully, the data module responded with a message that says the remote end connected at 1200 bps.
The remote end may do nothing until you press a particular key a few times, usually [ Enter
]. Typical of many data communications application
programs, this sometimes required input lets the remote end determine whether you have connected with the correct communications parameters in effect.
If the response from the remote end is unintelligible “garbage,” chances are that the speed or parity bit selection is incorrect. In this case, assuming that your terminal device allows, the parameters may be corrected without disconnecting the call. Otherwise, you must disconnect, correct the parameters, and then try the call again.
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Another possible problem is that the remote end response contains
normal words mixed in with strange characters, many of which are left brackets ([). This usually indicates that the remote device is sending ANSI display control sequences, and your terminal does not recognize them (ANSI stands for American National Standards Institute).
On a PC, this can generally be remedied by first disconnecting the call, editing the PC’s CONFIG.SYS file to include the line
DEVICE=ANSI.SYS
rebooting the PC, and then trying the call again. (For a log off procedure, see the alternative method under “Disconnecting a Data Call,” below.)
Note:
If the terminal device is not a PC, or the suggested remedy does not seem to solve the problem, and then you will need to consult the documentation for your dedicated terminal, or for your PC and any software involved.

Disconnecting a Data Call Most remote systems will have a command or menu selection for

logging off. When you select the appropriate means, the remote system will usually disconnect or hang up. The PBX will disconnect from the call and, after a moment, the data module will send the following message to your display:
NO CARRIER
Alternatively, you can use the following log off procedure:
Selection: +++ OK
The prompt Selection: is simply a representation of how the remote system might ask you for your next command or menu selection. Type the escape sequence (default is
+++)
but do
not
press
[ Enter ].
When the data module responds with OK, type the command line:
ath
[ Enter ]
The PBX will disconnect from the remote end device, and the 7400B
will send the OK message to the terminal display.
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CHAPTER 4: OPERATION AND CONFIGURATION
This chapter describes how to change, store, and recall configuration parameters, outlines how to create and save custom configuration profiles, and discusses more advanced command usage with example command lines.
CONFIGURATION
PARAMETERS
Values for configuration parameters are selected by using AT commands to change values contained in the S-registers. The S-
registers are a set of 8-bit memory locations that the data module reserves for storage of configuration settings. For a description of AT commands and S-registers used by the 7400B data module, refer to Appendix A, “AT Command Set,” and Appendix B, “S-Registers.”
Parameter Storage and
Configuration parameter values include the option values selected by
Retrieval AT commands that require option values, and the values stored in the
S-registers. A complete set of configuration parameter values is called a profile. The 7400B Data Module has four configuration profiles at any given time, one active, two stored, and one that permanently contains the factory-default values.
Unsaved changes to configuration parameters remain in effect until they are changed again, or until the data module is disconnected from the AC power source. Before making or storing any changes, or to check changes that you have made, you can issue an AT command to view the values that are currently in the active profile and the two stored profiles.
The active profile contains the parameter values that are currently in effect. All parameter values can be changed, and most changes can be stored to one of the two profile storage locations by issuing an AT command. Another AT command recalls values from one of the two stored profiles into the active profile.
Factory-default parameter values are a selection of values that are appropriate for a wide number of applications. These values are stored permanently in ROM and you can issue an AT command to recall them into the active profile at any time.
Commands to view, store, and recall configuration parameters are summarized in Table 4-1. The commands discussed in this section are described in greater detail in Appendix A, “AT Command Set. ” To determine whether a configuration parameter that affects a particular S­register can be stored in memory, refer to Appendix B, “S- Registers.”
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Command Line:
at&v
[ Enter ]
Action:
Display current AT command settings and S-register values in the active profile and the two stored profiles (also displays the four stored telephone numbers, which are described in a section of this chapter titled “Number Storage”).
n
[ Enter ]
at&w
Store the configuration parameters in the active profile to one of the two storage locations, where n represents the desired location and may be 0 or 1.
atz
n
[ Enter ]
Immediately reset the data module and recall one of the two stored configuration profiles into active status, where n represents the desired profile and may be 0 or 1.
at&y
n
[ Enter ]
Recall one of the two stored configuration profiles into active status when the data module is powered on, where n represents the desired profile and may be 0 or 1.
at&f
[ Enter ]
Recall the factory-default configuration settings into the active profile.
TABLE 4-1 Commands to Store, Recall and View Configuration Parameters

PC Software

OPERATING MODES

Many data communications software packages for use with PCs provide the possibility of writing script or command files. These files can then be run to execute a sequence of commands that will configure your
system, or even provide an automatic log on procedure for a particular
remote end device. Guidelines for use of some of the more popular software packages with
the 7400B Data Module are provided in Appendix C, “Application Notes.”
Except when a test condition has been initiated, the 7400B Data Module
is always in one of two states: command mode and on-line or data mode. When power is first applied, the data module initializes to command
mode.
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In command mode, the 7400B Data Module looks at everything you type on your keyboard. When you type in something that the data module recognizes as a valid command with a valid parameter (if
required), it will execute the action requested. A valid command with an invalid parameter will produce the ERROR result code, and an invalid command is simply ignored.
In on-line mode, everything you type is passed as data without
interpretation by the 7400B Data Module, except the escape sequence. The escape sequence, described in later paragraphs, provides a way of switching the data module back to command mode without disconnecting a data call.

ISSUING COMMANDS

The following paragraphs describe the elements of a command line and how the 7400B Data Module responds to a command line when it is issued.

Command Line Prefix

All commands issued to the 7400B Data Module, except the escape sequence and the repeat command, must begin with the letters “AT”.
This is called the command line prefix and must be entered as either both uppercase or both lowercase letters (that is, at and AT will work, but aT or At will not).
The AT prefix (also known as the ATtention command) alerts the data
module to expect one or more commands to follow. Each time the AT
prefix is sent, the data module adjusts its speed and parity to match your local terminal.

Command Buffer As you type in a command, each character is saved in a 40-character

buffer. The
AT
prefix, spaces, and the
[ Enter ]
at the end of the command line are not saved and do not add to the character count. If you try to type more than 40 countable characters on one line, the result code
ERROR will be displayed on your terminal screen, and the command
line will be ignored.

Command Line Set Up A command line begins with the AT prefix, includes one or more

commands, and finishes with a line termination, usually issued by pressing the
[ Enter ]
key. The factory-default line termination character is an ASCII carriage return, represented by the decimal number 013 stored in S-register S03.
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Note:
A special application may require choosing a different line terminating character, accomplished by issuing the command:
ddd
ats3=
[ Enter ]
where ddd is a 1- to 3-digit decimal representation of the ASCII character with a range of 0 through 127 (see ASCII Character Set in Appendix D).
Caution:
Before changing this or any other default ASCII character, make certain that your terminal device will recognize the new character.
If you make an error while typing a command line, you can send the backspace character, usually issued by pressing the
[ Backspace ]
key, as
often as needed to delete the error. However, as soon as you enter the AT prefix, the data module immediately reads it and sets up for a command to follow. Hence, you cannot delete the AT prefix once it is typed.
The factory-default backspace character is an ASCII backspace, represented by the decimal number 008 which is stored in S-register S05.
Note:
A special application may require choosing a different
backspace character, accomplished by issuing the command:
ats5=
ddd
[ Enter ]
where ddd is a 1- to 3-digit decimal representation of the ASCII character with a range of 0 through 127 (see ASCII Character Set in Appendix D).
Caution:
Before changing this or any other default ASCII character, make certain that your terminal device will recognize the new character.
Once you complete a command line by pressing [ Enter
], the data module
will try to interpret all characters on the command line as valid commands. If the data module finds a character that is not a valid command, it will ignore the erroneous character and any remaining characters on the command line; if it finds an incorrect parameter for a valid command, the data module will issue the ERROR result code and ignore any remaining characters.
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Command
Most commands are acted upon immediately and are acknowledged by
Acknowledgement the result code OK. This assumes that the result codes are configured in
the verbose form (command
V1
is in effect), and are enabled
(Q0
in
effect). Other options are the short or numeric form result code is set
(V0),
visible acknowledgement
which would produce a 0 (zero) instead of the message
(Q1).
Refer to Appendix A, “AT Command
OK,
and no
Set” for descriptions of the V and Q commands. Several other result codes may appear on your terminal screen while the
data module is completing a call. The option selected by the X command controls which of these result codes may appear on the screen of your terminal (the X command is described in Appendix A). All result codes that may be returned by the 7400B Data Module are shown in Table 4-2 and in Appendix D, “Quick-Reference Summaries.”
Verbose Form
OK CONNECT
Numeric
0 1 Connection made at 300 bps
Description
Command accepted
Note: If command X1 is in effect, CONNECT
means connection made at whatever speed both ends of the call agreed upon.
RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 19200
TABLE 4-2 Result Codes
2 3 4
5
6
7
10 11 12 14
Ring signal detected Carrier signal not detected or lost Error in command line Connection made at 1200 bps No dial tone detected Busy signal detected Connection made at 2400 bps Connection made at 4800 bps Connection made at 9600 bps Connection made at 19200 bps
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Multiple Characters If you type in the at prefix and it displays on your screen as aatt,

you may disable the command echo by typing the following command:
ate0
[ Enter ]
The command will appear as aattee00 as you type it, but the data module will send the response code OK to your screen. The next command that you type should appear in single characters.

FROM DATA MODE TO COMMAND MODE AND BACK

DIALING A NUMBER

A special escape sequence can be typed at any time during a data call to return temporarily to command mode. Your call does not disconnect, but data is not exchanged. Once you have “escaped” to command mode, the data module returns OK to acknowledge that it has entered command mode (see previous section titled "Command Acknowledgement").
At this point, you can issue commands to the data module. As long as the data call has not been disconnected, you can use the O command to return to on-line mode.
One other condition will cause the data module to switch from data mode to command mode. If the PBX senses that the remote device has disconnected, it will disconnect the call to the data module. The data module will turn off the CD, OH, and DATA LEDs (see note), display a result code message on your terminal screen (such as NO CARRIER), and then return to command mode.
The escape sequence and all other commands discussed in this section are explained in Appendix A, “AT Commands.”
The dial command is issued to the 7400B Data Module in the form
atd
nnn...n, where nnn...n represents the number you wish to dial. The command line can hold up to 40 characters, so you can usually precede the D command with other commands on the same line, if you wish.
Note:
Every character following the D command is regarded as part of the number to be dialed and is sent to the PBX; hence, the D command must be the last command in the command line.
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The following is an example:
atd74768
[ Enter ]
In the example, the command will cause the data module to go off hook, dial the number, and then wait the period of time specified in S-register S7 for the call to be completed.
If the call is not completed, the data module will disconnect and send the result code NO CARRIER to your display screen. When a call is successfully completed, the data module will send the result code CONNECT nnnn to your screen, where nnnn represents the speed of the 7400B Data Module, (for example, 1200).

REPEATING A COMMAND As mentioned earlier, the command buffer contains the last completed

command line. If you wish to repeat the previous command line without retyping it, type A/ without the AT command prefix and without pressing
[ Enter ].
This command is most useful when you have typed a command line to have the 7400B Data Module dial a number, and the data module returns the result code BUSY. Use the A/ command to redial the number as often as you wish.
STORING A TELEPHONE
The 7400B Data Module is capable of storing up to four telephone
NUMBER numbers, each of which can contain up to 25 characters. Numbers
stored in this way remain available indefinitely, even after the data module has been powered off and then on again.
Table 4-3 describes the command lines used to store a telephone number, delete a number from storage, and dial a stored number.
Note:
Digits 0 through 9 and all letters “a” through “z” and “A” through “Z” may be part of the stored “number.” Spaces and hyphens (-) may be used in the number when typing the command line. Spaces are not stored and do not add to the total count of characters in the stored number, but all other ASCII characters are stored and counted. Any ASCII character may be used, as long as it is acceptable to the PBX.
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Command line:
at&z
m=nnn...n
at&z
m=
[ Enter ]
atds=m [ Enter ]
[ Enter ]
Action:
Store number nnn...n in location m, which is one of four locations designated by the numbers 0 through 3. For
example:
at&z2=92015551212
[ Enter ]
stores the number 92015551212 in number storage location 2. Delete any number stored in location m, which is one of four
locations designated by the numbers 0 through 3. For example:
at&z2=
[ Enter ]
deletes any number that may have been stored in number storage location 2.
Dial the number stored in location m, which is one of four
locations designated by the numbers 0 through 3. For
example:
atds=2
[ Enter ]
causes the data module to send whatever is contained in number storage location 2 to the PBX as a number to be dialed.
TABLE 4-3 Commands for Using Stored Telephone Numbers

AUTOMATIC ANSWERING

The 7400B Data Module can be set up to answer incoming data calls automatically. To initialize this option, type the command line:
nnn
ats0=
[ Enter ]
where nnn is a decimal number in the range of 1 through 255, representing the number of rings to wait before answering.
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If nnn is 0 (the factory-default setting), the automatic answer feature is turned off. The red LED on the front of the data module labeled “AA” lights when the automatic feature is turned on.

REMOTE SITE USE

The 7400B Data Module can be used at a remote site as a dedicated service device to answer incoming data calls, send data to a remote end device, and then hang up. For example, you may wish to provide access to a printer from a remote site.
The following is a typical command line you might use for setting up this operation (spaces are used here for readability, but are not required):
at &c1 &d2 q1 s0=1 &w0 &y0
[ Enter ]
Following the at prefix, the commands in the example produce the following results:
●
&C1
sets the Data Carrier Detect (DCD) circuit of the data module
to operate according to the EIA standard.
●
&D2
sets the data module to go on hook when an on-to-off transition is detected on the Data Terminal Ready (DTR) input, disconnecting the call
●
Q1
turns off the result codes that would be the normal responses of
the data module to commands that it receives.
●
S0=1
turns on the automatic answer feature and causes the data
module to answer an incoming data call on the first ring.
&W0
●
causes the current configuration to be stored in data profile storage location 0.

RESET AND CONFIGURATION RECALL

●
&Y0
selects the configuration stored in data profile storage location
0 to become the current configuration each time the data module is
powered on
Refer to Appendix A, “AT Command Set,” for a complete description of each command used in this section.
Two commands are available for recovering from various data communications problems. You can reset the 7400B Data Module and recall one of two stored data profiles as the current configuration. The form for this command is as follows:
n
[ Enter ]
atz
where n is the number 0 or 1, representing the data profile to be recalled.
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A second command allows you to recall the factory-default configuration if, for instance, you loose track of changes you have made and need to start over. The form for this command is as follows:
at&f
DEFINITY Communications System
7400B Data Module
User’s Guide
[ Enter ]
DEFINITY Communications System 7400B Data Module User’s Guide
CHAPTER 5: TROUBLESHOOTING
CHAPTER 5: TROUBLESHOOTING
Page 5-1
This chapter describes procedures for troubleshooting most problems that may be encountered while installing, configuring, and operating the 7400B Data Module.
HOW TO USE THIS
CHAPTER
Use the following guidelines to isolate and correct a problem:
1.
Scan through the “Symptom” column in the chart to find the description that best describes the problem situation you have encountered.
In the “Problem” column, one or more problem descriptions is
2. offered. Select the one that best describes the observable condition, or try each suggestion in turn until the trouble has been corrected.
Perform the task described in the “Solution” column. In cases
3. where you are directed to type an AT command to correct the problem and the 7400B Data Module is in the command mode, simply type the command; from data mode, do the following:
Type the escape sequence
a.
(+++)
to enter command mode; the data module will respond with OK or 0 (unless the Q1 option has been set to disable result codes).
Type the suggested command line (if the solution suggests
b.
disconnecting the call, type the command line
4.
To return to data mode after using the escape sequence to enter command mode, type the command line
ato
ath
[ Enter ].
[ Enter ]).
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Symptom
All LEDs are off.
Problem
Power is off.
POWER/TEST and DATA The data module has lost LEDs flash together. communications with the
PBX.
Characters typed on
If the SD LED does not keyboard are not flash when keys on the displayed on the screen of the terminal device.
terminal are pressed, the
EIA-232-D cable is not
connected or not properly
wired.
If the SD LED flashes but
the RD LED does not
flash, the command echo
option is turned off.
Solution
Check that the AC outlet is live. Check that the power supply unit is connected to the 7400B Data Module and to the AC outlet.
Check that the D8W cord is connected between the LINE connector of the data module and a PBX wall jack. Note also that the line from the PBX must be properly administered for the 7400B Data Module.
Connect or replace the EIA-232-D cable between the data module and the local terminal device.
Press
[ Enter ]
to start a new
command line, and then type
atel
[ Enter ]
to turn on the command echo.
The SD and RD LEDs
flash, but certain EIA
signal leads are turned off.
Press
[ Enter ]
to start a new
command line, and then type
at&s0&c0
[ Enter ]
to ensure that the appropriate EIA signal leads are turned on.
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Symptom
Problem Solution
Call disconnects The speed of the far end immediately after an
device is higher than the attempt to connect; NO speed of the local terminal CARRIER may be
device. displayed on the local terminal device; CHECK SPEED LED lights.
The far end device is set
up for half-duplex or
synchronous operation.
Call disconnects
The far end device is busy immediately after an with another call. attempt to connect; BUSY may be displayed on the local terminal device; CHECK SPEED LED does not light.
Change the speed of the local terminal device to match that of the far end device. If the speed of the far end device is not known, set the local terminal device to the highest speed available.
The 7400B Data Module cannot communicate with a far end device that is operating half-duplex or synchronous. This problem can be resolved only if the far end device can be reconfigured for full­duplex, asynchronous operation.
Try the call again.
The telephone number
Check the number of the far end
was dialed incorrectly. device that you wish to call and try
the call again.
The far end device is not busy, but the PBX has restricted access to the
This situation can only be resolved by having the PBX readministered to remove the access restriction.
called device.
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Symptom
Problem
The PC communications The data module has software indicates that the
ignored the on-to-off call has been transition of the DTR disconnected, but the
lead.
DATA LED remains lit.
The data module has
ignored the H (hang-up)
command.
Solution
From command mode, type the command
at&d2
[ Enter ]
to set the DTR lead option to disconnect on DTR lead transition from on-to-off. Alternatively, determine and use the command provided by the communications software to implement this change.
Ensure that after the escape sequence
(+++)
has been entered to switch the data module to command mode, an adequate pause is allowed before issuing the H command. In escaping to command mode with the result codes enabled, the data module must be given time to return OK or 0 before it is ready to accept a command.
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Symptom
The AA LED flashes but the data module does not automatically answer the
Problem Solution
The automatic answer option is not enabled;
when there is no incoming
incoming call. call, the AA LED is off.
The automatic answer
option is enabled; the AA LED is on when there is no incoming call, but the terminal device is not ready (TR LED is off).
The automatic answer option is enabled; the AA and TR LEDs are lit, but the POWER/TEST lamp is flashing, indicating that the data module is in a local loopback test mode.
From the command mode, type
ats0=1
[ Enter ]
to turn on the automatic answer feature. Set the value following the equal sign (1 in the example) to the ring number on which you want the data module to answer an incoming call. The automatic answer feature is turned off by setting this value to 0.
If the local terminal is a PC, configure the communications software to turn on the DTR lead, or set the data module to ignore the DTR lead by typing
at&d0
[ Enter ]
Terminate the local loopback test by typing
at&t0
[ Enter ]
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Symptom
Transmitted and/or received data contains errors.
The DATA LED is lit, but a CONNECT xxxx message or numeric result code was not displayed.
Problem
Speed settings of the
terminal device and the data module are not the same.
The local terminal device and the far end device are
configured for different parity settings.
Far end data errors only during file transfer with PC data communication
software.
The display result codes option is turned off.
Solution
Change terminal device speed to
agree with the speed that was indicated in the C0NNECT nnnn message.
Change the parity setting of the
local terminal device to match that
of the far end device.
Disconnect the call, set the data metering option to off (see
“Setting the Hardware Option DIP Switches” in Chapter 2), re­establish the call, and try the file transfer again.
Turn on the display result codes
option by typing
atq0 o
[ Enter ]
The O command at the end of the above command line will cause the data module to return to the on-line mode and send the CONNECT xxxx
message, or an equivalent numeric code, to the terminal display (see “Result Codes” in Appendix D).
Numeric code returned when CONNECT xxxx message is preferred.
The result code format option is set to numeric
form.
Change the result code format
option to message form by typing
atv1
[ Enter ]
DEFINITY Communications System CHAPTER 5: TROUBLESHOOTING
7400B Data Module
User’s Guide
Page 5-7
Symptom Problem
Commands are displayed without error as they are typed (echoed), but the data module does not
The local terminal device Set the terminal device for one of is set to a speed not supported by the 7400B Data Module.
Solution
the supported speeds: 300, 1200, 2400, 4800, 9600, or 19200 bps.
respond to any command. The CONNECT message The data module is Configure the data module to send
is sent without a speed indication, but the far end device is not set at 300 bps.
The terminal device has its DTR lead turned on,
configured to display only CONNECT nnnn messages for all the basic set of result codes (option
x0).
A defective or non­standard (null-modem)
speeds except 300 bps by typing
atx4
[ Enter ]
Replace the EIA-232-D cable with one that is wired correctly.
but the TR LED is off. EIA-232-D cable is in use.
DEFINITY Communications System 7400B Data Module
User’s Guide
APPENDIX A: AT COMMAND SET
Label Description
APPENDIX A: AT COMMAND SET
Page A-1
This appendix contains an explanation of each AT command accepted by the 7400B Data Module. Labels used in the descriptions are defined as follows:
Command:
Function:
Type:
Arguments:
S-Register:
The command is shown as it should be typed. The command may be typed in uppercase or lowercase. Spaces may be typed between multiple commands on the same command line for readability, but the spaces are ignored by the 7400B
Data Module.
A brief, functional description of the command is provided here.
Type may be immediate or configuration. An immediate command causes the data module to perform an action as soon as the command is sent (for example, go off-hook or dial a number). A configuration command modifies a configuration parameter during the current session.
Many commands accept or require a numerical argument. Whether an
argument is required and the range of acceptable values for the argument is
shown here.
The S-registers consist of 28 1-byte memory locations in the data module, designated as S0 through S27. The S-registers hold values for defining the current configuration of the data module. Some commands modify a specific
S-register, and some commands perform an action based on the current value stored in an S-register. Whether an S-register is modified or read by the current
command is explained here.
(more)
APPENDIX A: AT COMMAND SET
Page A-2
Label Description
(Contd.)
DEFINITY Communications System
7400B Data Module
User’s Guide
Example:
Comments:
See Also:
A sample command line follows this label to demonstrate how the command may be used.
An explanation of the example and any other information about the command not provided elsewhere is provided here. Additional commands may be typed
on the same command line with the command currently under discussion, unless noted otherwise.
Following this label are suggestions on where to look for more information about the current command and a listing of any other commands that may be used with or affect the use of the current command.
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX A: AT COMMAND SET
Page A-3
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
+++
Escape sequence.
immediate
none
none
+++
The purpose of the +++ command is to provide a way to switch the
data module from on-line or data mode to command mode without disconnecting a data call that is in progress. As long as the call is not disconnected, you can return to the on-line mode with the O command.
This is one of the two commands that does not require the AT prefix
(A/
is the other one), and it is never followed by pressing
[ Enter ].
The value in S12 determines how long your keyboard should remain idle before entering the escape sequence, as well as the maximum allowable time between entering each character of the sequence. The character used in the escape sequence is determined by the value in S2 (default is ASCII 43, the plus sign).
See Also:
Chapter 3, “First Time Users,” Chapter 4, "Operation and Configuration"; the O command in this appendix; S2 and S12 in Appendix B.
APPENDIX A: AT COMMAND SET
Page A-4
DEFINITY Communications System
7400B Data Module
User's Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Command:
A
Go off-hook in Answer mode.
immediate
none
Bit 7 of S14 is set to 0.
ata
[ Enter ]
The A command causes the data module to go off-hook in answer mode and attempt to answer an incoming call. The option set by the
&D
command and the contents of S0 and S1 are ignored when this
command is issued.
Command &D; Chapter 3, “First Time Users,” Chapter 4, “Operation and Configuration”; Appendix B, “S- Registers.”
A/
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Re-execute the last valid command line.
immediate
none
none
a/
This is one of the two commands that does not require the AT prefix
(+++
is the other one). To repeat the previously executed command line exactly, type A/ without pressing the Return or Enter key. This command must be typed at the beginning of a new line and cannot be combined with any other command.
Chapter 3, "First Time Users."
DEFINITY Communications System 7400B Data Module User’s Guide
APPENDIX A: AT COMMAND SET
Page A-5
Command:
Function:
Type:
Arguments:
D
Dial a telephone number.
immediate
The D command requires an ASCII character string, which is sent by the data module to the PBX. The string may include any ASCII character, with the following restrictions:
●
If the letters “t” or “p” (uppercase or lowercase) are typed as the first character following the D command, the data module will delete either character.
For example, if you want your dial string to be the mnemonic “TEXAS,” you must type the “T” twice (the first “t” may be uppercase or lowercase), producing the command line:
atdtTEXAS
[ Enter ]
The “t” following the D command will be discarded and the string “TEXAS” will be sent to the PBX as a dial mnemonic (the PBX must be administered to recognize this mnemonic as the representation of a number to be dialed).
The PBX may interpret certain non-alphanumeric characters as
●
commands and perform an unexpected action, if you did not intend to send the command to the PBX. Consult the documentation for your PBX to determine which characters may be interpreted as commands.
●
The string (or AT command) s
=n, where n may be a number
from 0 through 3, will cause the data module to send the contents of its respective telephone number storage location to the PBX as the telephone number. For details on how to use this feature, refer to “Storing a Telephone Number” in Chapter 4,
“Operation and Configuration.”
(more)
APPENDIX A: AT COMMAND SET
Page A-6
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
S-Register:
Example 1:
Example 2:
Comments:
See Also:
D
(Contd.)
Bit 7 of S14 is set to 1.
atd555–1212
atds=1
[ Enter ]
[ Enter ]
In example 1, the number 555-1212 is dialed. The hyphen (-) is optional and may be used for easier reading of the command line. In example 2, the number stored in telephone number location 1 is dialed. The maximum length of the ASCII string is 39 characters; the AT prefix, the carriage return, and spaces used for readability do not add to the character count for the line.
Note:
Other commands should not be issued following the dial string until the call is either completed or fails. If anything is typed before the call is completed, the call will fail.
Chapter 3, "First Time Users," Chapter 4, "Operation and
Configuration."
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
E
Turn the command echo on or off.
configuration
No argument or an argument of 0 disables echo and an argument of 1 enables echo. The factory-default is 1.
Bit 1 of S14 is set according to the argument of the command.
ate1
[ Enter ]
Typically, for a display terminal operating in full-duplex mode, use the
1 argument if you wish to see the AT commands on the screen as you
type them. If your display terminal is operating in half-duplex mode, use the 0 argument (the 1 argument would cause characters typed to appear on the screen like tthhiiss).
Chapter 4, “Operation and Configuration.”
DEFINITY Communications System APPENDIX A: AT COMMAND SET
7400B Data Module
User’s Guide
Page A-7
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
H
Switch hook control.
immediate
No argument or an argument of 0 causes the data module to go on­hook.
none
ath
[ Enter ]
The H command with no argument can be used during a data call to cause the 7400B Data Module to go on-hook (hang up) after using the escape sequence
(+++)
to return to command mode. An argument of 0 produces the same result, and an argument of 1 is accepted but causes no action.
The escape sequence command
(+++);
Chapter 4, “Operation and
Configuration.”
APPENDIX A: AT COMMAND SET
Page A-8
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
I
Request product code or ROM checksum.
immediate
The I command accepts one of three arguments as follows:
0 - The data module displays the decimal number 249, followed by a carriage return and line feed.
1 - The data module displays the ROM checksum as two four-digit
hexadecimal values, followed by a carriage return and line feed.
2 - The data module displays OK, followed by a carriage return and line feed.
none
ati0
[ Enter ]
In the example, the 7400B Data Module will return its product ID code as the value 249.
none
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
O
Return to the on-line mode.
immediate
No argument or an argument of 0 (zero) causes the data module to return from command mode to on-line mode, if a data call is still
active.
none
ato
[ Enter ]
The 7400B Data Module accepts an argument of 1 but treats it the same as no argument or an argument of 0.
Chapter 4, “Operation and Configuration”; the +++ command in this appendix.
DEFINITY Communications System 7400B Data Module User's Guide
APPENDIX A: AT COMMAND SET
Page A-9
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Q
Turn the display of result codes on or off.
configuration
No argument or an argument of 0 enables the display of result codes; an argument of 1 disables the display of result codes. The factory­default is result codes enabled.
Bit 2 of S14 is set according to the argument used with the Q command.
atq1
[ Enter ]
In the example, the result codes are disabled. Use this option only if you wish to prevent the data module from returning result codes after an AT command is issued.
Chapter 4, “Operation and Configuration;” result codes in either Chapter 4 or Appendix D, “Summary Tables;” the V and X commands in this appendix.
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
V
Select format for result codes.
configuration
No argument or an argument of 0 causes the data module to return the short form or numeric result codes; an argument of 1 causes the data module to return the verbose form or text message result codes. The factory-default setting is the verbose form.
Bit 3 of S14 is set according to the argument used with the V command.
atv
[ Enter ]
The example would set the short form or numeric result code format.
Chapter 4, “Operation and Configuration”; result codes in either Chapter 4 or Appendix D, “Summary Tables;” the Q and X commands in this appendix.
APPENDIX A: AT COMMAND SET DEFINITY Communications System
7400B Data Module
Page A-10 User’s Guide
Command:
Function:
Type:
Arguments:
X
Control the extended result code set and dialing capabilities.
configuration
The X command accepts one of 5 arguments as follows:
0 - The basic result code set (0—4) is enabled. No dial tone or busy
signal detection. No speed indication on connect. 1 - Result codes 0—5, 10—12, and 14 are enabled. No dial tone or
busy signal detection. Speed indication on connect. 2 - Result codes 0—6, 10—12, and 14 are enabled. Wait for dial tone
before dialing. Call is aborted if dial tone is not detected within
length of time in S7. No busy signal detection. Speed indication on
connect.
3 - Result codes 0—5, 7, 10—12, and 14 are enabled. No dial tone detection. Busy signal detection enabled. Speed indication on connect.
4 - Result codes 0 - 7, 10 - 12, and 14 are enabled. Blind dialing capability is disabled. Speed indication is provided when a connection is established. Busy signal detection and dial tone detection are enabled (see comments). This is the factory-default setting.
S-Register:
Example:
Comments:
See Also:
Bits 4, 5, and 6 of S22 are set according to the argument given with the
X
command.
atx2
[ Enter ]
In the example, the results described under argument value 2 are implemented. Regardless of which argument is used, the data module
will wait until the call is completed, or the time set in register S7 expires. All arguments do change the appropriate bits in S22 and affect the result codes returned.
Chapter 4, “Operation and Configuration”; result codes in either Chapter 4 or Appendix D, “Summary Tables;” the Q and V commands in this appendix.
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX A: AT COMMAND SET
Page A-11
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Z
Reset and recall a stored profile.
immediate
No argument or an argument of 0 recalls the configuration profile stored in location 0; an argument of 1 recalls the configuration profile stored in location 1.
none
atz1
[ Enter ]
In the example, the z command causes the 7400B Data Module to reset, and then loads the configuration profile stored in location 1 into the active location.
Chapter 4, “Operation and Configuration.”
APPENDIX A: AT COMMAND SET
Page A-12
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
&C
Data Carrier Detect (DCD) options.
configuration
The &C command accepts one of two arguments as follows:
0 - (or no argument) maintain the DCD circuit on at all times (factory-default setting)
1 - the DCD circuit operates according to the EIA-232-D standard
Bit 5 of S21 is set according to the argument used with the &C
command.
at&c1
[ Enter ]
In the example, the DCD circuit operates according to the EIA-232-D standard. This would be an appropriate setting for when the 7400B Data Module is used at a remote site.
Regardless of which option is currently in effect, the DCD circuit of
the 7400B Data Module is always off during self-test, and turns off for
0.5 second during a disconnect sequence.
See Also:
Chapter 4, “Operation and Configuration”; Appendix B, “S-
Registers.”
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX A: AT COMMAND SET
Page A-13
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
&D
Data Terminal Ready (DTR) options.
configuration
The &D command accepts one of four arguments as follows:
0 - ignore the DTR interchange circuit (factory-default setting).
1 - return to the command state if an on-to-off transition is detected
on the DTR input; an active data call is not disconnected.
2 - go on hook when an on-to-off transition is detected on the DTR input (EIA-232-D standard); an active data call is disconnected.
3 - perform a reset if an on-to-off transition is detected on the DTR
input; an active data call is disconnected.
Bits 3 and 4 of S21 are set according to the option used with the &D command.
at&d2
[ Enter ]
In the example, the DTR circuit is set according to the EIA-232-D standard. This would be an appropriate setting for when the 7400B Data Module is used at a remote site as a dedicated device to
automatically answer an incoming data call.
See Also:
For the 0 option, the front panel DTR indicator (TR LED) is always on,
regardless of the state of the DTR input; for all other options the
indicator follows the state of the DTR input. If the change of state for the DTR circuit persists for a time shorter
than specified in S25, the change is ignored.
Chapter 4, “Operation and Configuration”, Appendix B, “S­Registers.”
APPENDIX A: AT COMMAND SET
Page A-14
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Command:
Function:
&F
Load the factory-default configuration.
immediate
none
none
at&f
[ Enter ]
The factory-default configuration values are permanently stored in ROM and can be recalled at any time. No reset or self-test is initiated by issuing the &F command.
Chapter 4, “Operation and Configuration.”
&S
Data Set Ready (DSR) options.
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
configuration
The &S command accepts one of two arguments as follows:
0 - (or no argument) the DSR circuit is maintained on at all times
(factory-default setting)
1 - the DSR circuit operates according to the EIA-232-D standard.
Bit 6 of S21 is set according to the argument used with the &S command.
at&s1
[ Enter ]
In the example, the DSR circuit is configured to operate according to the EIA-232-D standard. Regardless of which option is currently in effect, the DSR circuit of the 7400B Data Module is always off during self-test, and turns off for 0.5 second during a disconnect sequence.
Chapter 4, “Operation and Configuration.”
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX A: AT COMMAND SET
Page A-15
Command:
Function:
Type:
Arguments:
S-Register:
&T
Control diagnostic and test facilities.
immediate
The &T command accepts one of eight arguments (see comment 2) as
follows:
0 - (or no option) terminate any test in progress (see comment 3)
1 - initiate local digital loopback test 2 - same as 1 3 - initiate local data loopback test 4 - allow remote digital loopback requests from the remote system
(factory-default selection) 5 - deny remote digital loopback requests from the remote system 6 - initiate remote digital loopback test 7 - initiate remote digital loopback test with self-test 8 - initiate local digital loopback test with self-test
Bits 0 and 2—6 of S16 are set according to the argument used with the
&T
command.
Example:
Comments
See Also:
at&t3
1.
2.
[ Enter ]
(see comment 1)
In the example, a local data loopback test is initiated.
All argument values in the range of 0—8 are valid. All of the options selected by the command arguments described above are accepted and implemented by the 7400B Data Module, but they are named differently than in the EIA-232-D standard.
If the local digital loopback or remote digital loopback tests are
3. in progress, it is necessary to issue the escape sequence to return to command mode before the &T0 command can be used to terminate these tests. The test timer value stored in S18 can also be set to halt automatically any locally initiated test in progress.
Chapter 4, “Operation and Configuration;” Appendix B, “S­Registers.”
APPENDIX A: AT COMMAND SET
Page A-16
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
&V
View the active configuration and stored profiles.
immediate
The
&V
command does not take an argument.
none
at&v
[ Enter ]
The &V command displays all active and stored configuration data as follows (see sample screen below):
●
command and S-register settings for the active configuration
profile
●
command and S-register settings saved in configuration profile locations 0 and 1
●
contents of the four telephone number storage locations
Chapter 4, “Operation and Configuration.”
ACTIVE PROFILE: B1 E1 L2 M1 Q0 V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0 &Y0 S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:060 S08:002 S09:006 S10:014 S12:050 S14:AAH S16:00H S18:000 S21:00H
S22: 76F S23:0BH S25:005 S26:001 S27:40H
STORE PROFILE 0: B1 E1 L2 M1 Q0 V1 X1 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0
S00:000 S14:AAH S18:000 S21:00H S22:46H S23:OBH S25:005 S26:001 S27:40H
STORED PROFILE 1: B1 E1 L2 M1 Q0 V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0 S00:000 S14:AAH S18:000 S21:7H 001 S27:40H
Telephone Numbers: &Z0= 34017
&Z1= 95551212 &Z2= 74802 &Z3= PPARIS
OK
DEFINITY Communications System APPENDIX A: AT COMMAND SET
7400B Data Module
User’s Guide
Page A-17
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
Command:
&W
Store the active configuration profile.
immediate
No argument or an argument of 0 stores to location 0, an argument of 1 stores to location 1.
none
at&w0
[ Enter ]
In the example, the currently active configuration profile is stored to memory location 0. Only a subset of the configuration parameters are actually stored.
Chapter 4, “Operation and Configuration”; Appendix B, “S­Registers.”
&Y
Function:
Type:
Arguments:
Designate the default configuration profile.
configuration
An argument of 0 will recall stored profile 0; an argument of 1 will recall stored profile 1. Factory-default selection is stored profile 0.
S-Register:
Example:
none
at&y1
[ Enter ]
Comments: In the example, the configuration profile stored in location 1 will be
recalled the next time that the 7400B Data Module is powered on. When the &Y command is issued, the currently active profile does not change until the data module is powered off and then on again.
See Also: Chapter 4, “Operation and Configuration.”
APPENDIX A: AT COMMAND SET
Page A-18
DEFINITY Communications System
7400B Data Module
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
&Z
Store a telephone number.
immediate
The &Z command accepts one of four arguments (0 through 3), which designates the memory location in which the dialing string that follows
the command will be stored.
none
at&z2=555-1212
[ Enter ]
In the example, the dial string 555-1212 is stored in memory location
2. Each of the four number storage locations can store a maximum of 25 characters.
Chapter 4, “Operation and Configuration.”
DEFINITY Communications System APPENDIX B: S-REGISTERS
7400B Data Module
User’s Guide
Page B-1
APPENDIX B: S-REGISTERS
This appendix contains an explanation of each S-register used by the
7400B Data Module. An S-register is an 8-bit location in non-volatile memory that is used for storing the value of one or more configuration parameters. When the data module is first powered on, the values that
were last stored in the S-registers are the values in effect until AT commands are issued to change them.
You can check the current value stored in all S-registers with the &V command (see description in Appendix A, “AT Command Set”). To
look at the contents on just one register, use the command Smm
where mm is the number of the S-register. To change the value in any one S-register directly, use the command
S
mm=nnn, where mm is the number of the S-register and nnn is the number you wish to place in the register. The following dialog illustrates the use of the S command to read and change the value contained in an S-register:
?,
ats18?
[ Enter ]
055 OK
ats18=120
[ Enter ]
OK
The first command request the value stored in register S18. The data module returns the value 055, followed by OK. The next command changes the value in register S18 to 120, and the data responds with OK.
You could enter the first command a second time to verify that the value
was changed correctly.
More information is provided in the following definitions of the labels used in the S-register descriptions.
APPENDIX B: S-REGISTERS
Page B-2
DEFINITY Communications System
7400B Data Module
User’s Guide
Label
Register:
Description:
Range of
Values:
Description
The S-register is identified following this label. Note that the names
for S-registers 1 through 9 may be typed as two-digit numbers with leading zeros, if desired, for readability (e.g., S01 is equivalent to S1).
The purpose and use for the S-register is explained following this label.
The range of values that may be assigned to the register is explained following this label. The units for the value may be as follows:
decimal
●
—a one- to three-digit decimal number. Decimal numbers are typically used to represent a count, seconds, or fractions of a second.
ASCII
●
—a one- to three-digit decimal number that represents the decimal equivalent for an ASCII character (see ASCII Character Table in Appendix D, "Quick-Reference Summaries").
●
hexadecimal
—a two-digit hexadecimal number used to represent the contents of a bit-mapped S-register. Bit-mapped S-registers are not usually set by entering a complete value for the register, but are set one or more bits at a time by various AT commands. Hexadecimal digits include the decimal digits 0 through 9, and the letters A through F.
(more)
Notes:
1.
A value typed as a decimal or ASCII argument
to a command may be entered as a one, two, or three digit number, as required, but will always
be displayed as a three digit number (for example, you type the command ATS0=3 to set automatic answer feature to answer an incoming call on the third ring, and then type the AT&V command to verify the value, which is displayed
as S00:003).
2.
The &V command, which displays the contents
of all S-registers, presents the contents of bit-
mapped registers as two hexadecimal digits
followed by an uppercase letter H (for example, assuming that S-register S14 contains the value
AA hexadecimal, the AT&V command displays
S14:AAH).
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX B: S-REGISTERS
Page B-3
Label
Storable:
Comments:
See Also:
Description
(Contd.)
A yes after this label indicates that the contents of this S-register will be written when the current configuration profile is saved to one of the two configuration profile storage locations. A no here indicates that the contents of the S-register will not be written to storage.
Note:
Any changes to non-storable S-registers are lost when
power is removed from the Data Module; however, the &Y
command can be set to load a specific stored configuration profile at start up, and the values set by AT command arguments in the recalled profile will be placed into effect.
Additional information about the S-register is presented following this
label.
Following this label are references to other parts of this manual where you will find more information, and/or a list of other S-registers or AT commands that are associated with this S-register.
APPENDIX B: S-REGISTERS
Page B-4
DEFINITY Communications System
7400B Data Module
User’s Guide
Register:
S0
Description: The value in this S-register represents the ring number on which an
incoming call will be automatically answered.
Range of The value may be 000 through 255 rings. The factory-default setting is
Values:
Storable:
000 rings.
yes
Comments: Setting S-register S0 to any value from 001 through 255 enables
automatic answer; a value of 000 disables automatic answering. The count of incoming rings is stored in S-register S1.
See Also:
Register:
Description:
Chapter 4, “Operation and Configuration”; S-register S1.
S1
The number of incoming rings detected. Incremented each time a ring
is detected. It is cleared if no rings are detected for eight seconds.
Range of The value may be 000 through 255 rings. The factory-default setting is
Values:
000 rings.
Storable:
Comments:
See Also:
no
In the 7400B, incoming rings are not detected as such. The PBX notifies the 7400B of an incoming call and a ring cycle (RI lead) is generated internally. The register is incremented after each ring cycle.
Chapter 4, “Operation and Configuration”; S-register S0.
DEFINITY Communications System 7400B Data Module User’s Guide
APPENDIX B: S-REGISTERS
Page B-5
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
Register:
Description:
S2
This S-register stores the ASCII value of the escape sequence character.
Value may be 000 through 127 (see comments); factory-default setting is 043, the ASCII code for a plus sign (+).
no
Setting the value greater than 127 will disable escape sequence detection, in which case the escape sequence cannot be used to move
to command mode. The operation of the Data Terminal Ready (DTR)
circuit, set by the &D command, can still be used to move to command
state without disconnecting the call.
Chapter 4, “Operation and Configuration”; AT command &D in
Appendix A.
S3
This S-register stores the ASCII value of the carriage return character.
Range of
Values:
Storable:
Comments:
See Also:
Value may be 000 through 127; factory-default setting is 013, usually output by the Enter or Return key or the Ctrl-M key combination from a data terminal.
no
This character serves as the command terminator on an AT command line. It is also output following all result codes.
Chapter 4, “Operation and Configuration.”
APPENDIX B: S-REGISTERS
Page B-6
DEFINITY Communications System
7400B Data Module
User’s Guide
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
Register:
Description:
Range of
Values:
Storable:
S4
This S-register holds the ASCII value for the line feed character.
Value may be 000 through 127; factory default setting is 010, usually
output by the Ctrl-J key combination from a display terminal.
no
none
Chapter 4, “Operation and Configuration.”
S5
This S-register holds the ASCII value for the backspace character.
Value may be 000 through 032 and 127; factory-default value is 008, usually output by the Backspace key of a data terminal.
no
Comments:
See Also:
Register:
The operation of the backspace character is to move the cursor left one character space and (on a command line) erase the character moved to.
If command echo is enabled
(AT
command
E1),
the output of the backspace character is actually three characters: backspace, space, backspace.
Chapter 4, "Operation and Configuration."
S6
— not used
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX B: S-REGISTERS
Page B-7
Register:
S7
Description: Wait time for line signal or dial tone. If line signal is not detected
within this time, the call will be disconnected.
Range of Value may be 001 through 055 seconds; factory-default value is 030
Values:
Storable:
seconds.
no
Comments: This register will affect only the wait time for line signal detection.
The 7400B always waits the length of time in register S7 for the equivalent of a dial tone from the PBX.
See Also:
Register:
Register:
Chapter 4, “Operation and Configuration.”
S8
— not used
S9
— not used
Register:
Description:
S10
The value in this S-register determines how long the 7400B Data Module will wait after loss of line signal is detected before disconnecting.
Range of Value may be 000 through 255 tenths (0.1) of a second; factory-default
Values:
Storable:
Comments:
value is 014 tenths of a second (1.4 sec.).
no
The delay set by this S-register allows the receive line signal to disappear momentarily without causing a disconnect (hang-up).
Setting this S-register to the maximum value (255) causes the Data Module to ignore receive line signal status and not disconnect the data
call if line signal is lost.
See Also:
Chapter 4, “Operation and Configuration.”
APPENDIX B: S-REGISTERS
Page B-8
DEFINITY Communications System
7400B Data Module
User’s Guide
Register:
Register:
Description:
S11
— not used
S12
The value in this S-register determines the minimum delay required immediately before and after entering the escape sequence (guard time). It also determines the maximum interval allowed between entering each of the three consecutive characters of the sequence.
Range of Value may be 000 through 255 fiftieths (0.02) of a second; factory-
Values:
Storable:
Comments:
default value is 050 fiftieths of a second (1 sec.).
no
If the value in this S-register is set to 0, timing is not a factor in escape sequence recognition.
See Also:
Chapter 4, “Operation and Configuration.”
Register:
S13
— not used
DEFINITY Communications System 7400B Data Module User’s Guide
APPENDIX B: S-REGISTERS
Page B-9
Register:
Description:
Range of
Values:
Storable:
S14
This S-register is used to store the status of bit-mapped options as follows:
bit 0 — not used (always set to 0) bit 1 — 0 = command echo disabled, 1 = command echo enabled
(default = 1, see E command) bit 2 — 0 = result codes enabled, 1 = result codes disabled
(default = 0, see Q command) bit 3 — 0 = short result codes, 1 = verbose result codes (default = 1,
see V command)
bit 4
— not used (always set to 0)
bit 5 — 0 =not used (see comment 1) bit 6 — not used (always set to 0)
bit 7 — 0 = originate mode, 1 = answer mode (default = 1, see A and
D
commands)
Value may be 00 to FF hexadecimal; factory-default settings produce a value of AA (see comment 2).
yes
Comments:
See Also:
Register:
1.
In the DCP operating environment of the 7400B Data Module, tone and pulse dialing have no meaning. If the T or P dial modifiers are used, bit 5 is changed accordingly, but the data module performs no other action.
2.
Refer to the explanation of hexadecimal values under the Range
of Values label description at the beginning of this appendix.
Chapter 4, “Operation and Configuration”; refer to the indicated AT commands in Appendix A, “AT Command Set.”
S15
— not used
APPENDIX B: S-REGISTERS
Page B-10
DEFINITY Communications System
7400B Data Module
User’s Guide
Register:
Description:
Range of
Values:
S16
This S-register stores test function status in a bit-mapped format as
follows:
bit 0 — local digital loop test; 0 = test disabled, 1 = test in progress (default = 0, see the &T1 and &T2 commands)
bit 1 — not used (always set to 0)
bit 2 — local data loop test; 0 = disabled, 1 = test in progress
(default = 0, see &T3 command) bit 3 — status bit for remote digital loop initiated by remote system;
0 = off, 1 = in progress (default = 0, see &T4 and &T5 commands) bit 4 — remote digital loop; 0 = disabled, 1 = in progress (default = 0,
see
&T6
command)
bit 5 — remote digital loop with self-test 0 = disabled, 1 = in
progress (default = 0, see &T7 command) bit 6 — local digital loop with self-test; 0 = disabled, 1 = in progress
(default = 0, see &T8 command) bit 7 — not used (always set to 0)
Value may be 00 to FF hexadecimal; factory-default settings produce a value of 00 (see comment 1).
Storable:
Comments:
See Also:
Register:
no
Only one of the tests may be in progress at any time. The T0
1. command terminates any locally initiated test in progress and sets S-register 16 to 00.
Refer to the explanation of hexadecimal values under the Range
2.
of Values label description at the beginning of this appendix.
Chapter 4, “Operation and Configuration”; refer to the indicated AT command in Appendix A, “AT Command Set.”
S17
— not used
DEFINITY Communications System APPENDIX B: S-REGISTERS
7400B Data Module
User’s Guide
Page B-11
Register:
Description:
S18
The value in this S-register establishes the duration of diagnostic tests initiated by the &T command.
Range of Value may be 000 through 255 seconds. The factory-default value is
Values:
Storable:
Comments:
0.
yes
Any locally initialized test in progress is automatically terminated when the time specified in S-register 18 has elapsed. If S-register 18 is set to 0, a test initiated by the &T command must be terminated manually. Issuing the &T0 command terminates any locally initiated test immediately, regardless of the value in S-register 18.
See Also:
Chapter 4, “Operation and Configuration”; Appendix A, “AT Command Set.”
Register:
S19
— not used
Register:
S20
— not used
APPENDIX B: S-REGISTERS
Page B-12
DEFINITY Communications System
7400B Data Module
User’s Guide
Register:
Description:
Range of
Values:
Storable:
Comments:
S21
This S-register is used to store the status of bit-mapped options as
follows:
bit 0 — not used (default = 0, see comment 1) bit 1 — not used (always set to 0) bit 2 — not used (default = 0, see comment 1) bits 3 and 4 — DTR options; value depends on argument of DTR
option command (default = 00, see &D command) bit 5 — DCD options; 0 = always on, 1 = EIA-232-D standard
(default = 0, see &C command) bit 6 — DSR options; 0 = always on, 1 = EIA-232-D standard
(default = 0, see &S command) bit 7 — not used (default = 0 see comment 1)
Value may be 00 to FF hexadecimal; factory-default settings produce a value of 00 (see comment 2).
yes
1.
For the 7400B Data Module, bits 0, 2, and 7 will be set by the appropriate command, however, there will be no other effect.
2.
Refer to the explanation of hexadecimal values under the Range
of Values label description at the beginning of this appendix.
See Also:
Chapter 4, “Operation and Configuration”; refer to the indicated AT command in Appendix A, “AT Command Set.”
DEFINITY Communications System 7400B Data Module User’s Guide
APPENDIX B: S-REGISTERS
Page B-13
Register:
Description:
S22
This S-register is used to store the status of bit-mapped options as follows:
bits 0 and 1 — not used (default = 2, see comment 1) bits 2 and 3 — not used (default = 1, see comment 1) bits 4, 5 and 6 — result codes; value depends on argument of result
code options command (default = 0, see X command) bit 7 — not used (default = 0, see comment 1)
Range of Value may be 00 to FF hexadecimal; factory-default settings produce a
Values:
Storable:
Comments:
value of 76 hexadecimal (see comment 2).
yes
For the 7400B Data Module, bits 0 through 3 and bit 7 will be set
1. by the appropriate command, however, there will be no other effect.
2.
Refer to the explanation of hexadecimal values under the Range
of Values label description at the beginning of this appendix.
See Also:
Chapter 4, “Operation and Configuration”; refer to the indicated AT
command in Appendix A, “AT Command Set.”
APPENDIX B: S-REGISTERS
Page B-14
DEFINITY Communications System
7400B Data Module
User’s Guide
Register: Description:
Range of
Values:
Storable:
S23
This S-register is used to store the status of bit-mapped options as
follows:
bit 0 — allow remote loop request from remote system; 0 = disabled,
1 = enabled (default = 1, see &T command)
bits 1, 2, and 3 — local communications speed (see comment 1)
0 = 300 bps
1 = not used
2 = 1200 bps
3 = 2400 bps (factory-set default)
4 = 4800 bps
5 = 9600 bps
6 = 19200 bps
7 = not used
bits 4 and 5 — local parity setting; 0 = even, 1 = space, 2 = odd, and 3 = mark/none (default = 0)
bit 6 and 7 — not used (see comment 2)
Value may be 00 to FF hexadecimal; factory-default settings produce a
value of 07 hexadecimal (see comment 3).
yes
Comments:
See Also:
Register:
1.
Hayes compatible modems use only bits 0, 1 and 2 for speeds up to 2400 bps. The 7400B Data Module uses bit 3 to support speeds above 2400 bps.
2.
Bits 6 and 7 are set by the appropriate command, but there will be no other effect.
3.
Refer to the explanation of hexadecimal values under the Range
of Values label description at the beginning of this appendix.
Chapter 4, “Operation and Configuration”; refer to the indicated AT command in Appendix A, “AT Command Set.”
S24
— not used
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX B: S-REGISTERS
Page B-15
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
Register:
Register:
S25
The value in this S-register determines how long a change of state (OFF to ON or ON to OFF) on the Data Terminal Ready (DTR) lead must persist before it is acknowledged. If the change of state persists for a shorter time than is specified in S-register 25 it is ignored.
Values may be 000 through 255 hundreds of a second (0.01 sec.). The factory-default setting is 5 (0.05 sec.).
yes
none
Chapter 4, “Operation and Configuration.”
S26
— not used
S27
— not used
DEFINITY Communications System 7400B Data Module
User’s Guide
APPENDIX C: APPLICATION NOTES
APPENDIX C: APPLICATION NOTES
Page C-1
This appendix provides a list of application notes that describe how to administer specific AT&T PBX systems for using the data module and describes how to configure some popular PC data communications software packages for use with the 7400B Data Module.

PBX APPLICATION NOTES

PC APPLICATIONS GUIDE

The following application notes are used for administering AT&T PBX systems to recognize the 7400B Data Module:
AT&T DEFINITY Communications System Generic 1 and System 75
7400B Data Module Application Notes, ordering number 555-207-017
Application notes for using several popular PC data communications software packages with the 7400B Data Module are also available. This document contains information on several more packages than are contained in this Appendix.
AT&T 7400B Data Module PC Application Guide, ordering number
555-035-023.
APPENDIX C: APPLICATION NOTES
Page C-2
DEFINITY Communications System
7400B Data Module
User’s Guide

PROCOMM PLUS Procomm Plus is a data communications software package produced by

Datastorm Technologies, Inc. The following procedures are based on version 1.1B of the software package.

Configuring the Software

PROCOMM PLUS SETUP UTILITY
A –
Initialization command . .
B –
Dialing command . . . . . . . . .
C –
Dialing command suffix . .
D –
Hangup command . . . . . . . . . . ..
E –
Auto answer command . . . . .
F –
Wait for connection . . . . .
G –
Pause between calls . . . . .
H –
Auto baud detect . . . . . . . .
I –
Drop DTR to hangup . . . . .
J –
Send init if CD high . . . .
Note:
If Procomm Plus is being installed for the first time select Hayes 2400 as the modem type.
1.
To begin Procomm Plus, at the DOS prompt type
pcplus
2.
Press any key to display the Terminal Mode screen.
3.
Press
[ Alt ] [ s ]
4.
Select Modem Options.
5.
Check that the options displayed on your screen match those in the
[ Enter ]
to display the
SETUP FACILITY
menu.
menu below. Change any options that do not match.
MODEM OPTIONS
ATE1V1X4Q0&C1&D2 S7=255 s0=0ˆM
ATDT ˆM
˜˜˜+++˜˜˜ATH0ˆM
˜˜˜+++˜˜˜ATS0=1ˆM
45 seconds
4 seconds ON
YES YES
Alt-z:
Help Press the letter of the option to change: Esc: Exit
6.
When you are finished, press [ Esc
UTILITY
7.
Select Result Messages.
8.
Check that the options displayed on your screen match those in the
menu.
] to return the SETUP
menu below. Add the messages for options D, E, and F.
DEFINITY Communications System 7400B Data Module User’s Guide
PROCOMM PLUS SETUP UTILITY MODEM RESULT MESSAGES
APPENDIX C: APPLICATION NOTES
Page C-3
A –
300 baud connect message . . . . . .
B –
1200 baud connect message . . . . .
C –
2400 baud connect message . . . . .
D –
4800 baud connect message . . . . .
E –
9600 baud connect message . . . . .
F –
19200 baud connect message . . . .
G –
No connect message 1 . . . . . . . . . .
H –
No connect message 2 . . . . . . . . . .
I –
No connect message 3 . . . . . . . . . .
J –
No connect message 4 . . . . . . . . . .
Alt-z:
Help Press the letter of the option to change: Esc: Exit
9.
When you are finished, press MENU of the PROCOMM PLUS SETUP UTILITY.
10.
Select Save Setup Options.
11.
Press
[ Esc ]
to return to the Terminal Mode screen.
12.
Press
[ Alt ] [ x ]
to exit from Procomm Plus.
CONNECT
CONNECT 1200
CONNECT 2400 CONNECT 4800 CONNECT 9600
CONNECT 19200 NO CARRIER
BUSY NO DIALTONE
ERROR
[ Esc ]
twice to return to the
MAIN
Note: You must exit and restart Procomm Plus to implement
the changes to the software that affect the configuration of the 7400B Data Module.
13.
To restart Procomm Plus, at the DOS prompt type
pcplus
[ Enter ]

Placing a Call This example uses ATTMAIL as the system to be called.

1.
From the Terminal Mode Screen, press
DIALING DIRECTORY
shown below.
[ Alt ] [ d ]
Note: The screen shown includes the overlay windows for
revising a selected entry and saving the revisions to the PC hard disk.
to display the
APPENDIX C: APPLICATION NOTES
Page C-4
DIALING DIRECTORY: PCPLUS
NAME 1 2
3 4 5 6 7 8
I
-- I Revise Entry 1 I -------------------
9
10
---------
PgUp S I PgDn S I Home F I End La I Esc E
--------­Choice
PORT: COM1
I I
I
I
X
I I
NAME: ATTMAIL
NUMBER:
BAUD: 2400 I
PARITY: NONE DATA BITS: 8 STOP BITS: 1
DUPLEX: FULL
SCRIPT: I
PROTOCOL: XMODEM TERMINAL: VT102
SETTINGS: 2400 N-8-1 DUPLEX: FULL
9,1800-624-5123
--------------------------------------
I I CLEAR LAST DATE AND TOTAL? (Y/N) Yes I ACCEPT THIS ENTRY? (Y/N) Yes I SAVE ENTRY TO DISK? (Y/N) Yes
DEFINITY Communications System
7400B Data Module
User’s Guide
D
NUMBER
I I I
--------------------------------
I
-------------------------------
I
P D
BAUD 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F 2400 N-8-1 F
DIALING CODES:
SCRIPT
S
I
ed ectory
I I
des
I
ir
I
play

Disconnecting Call

2.
Use the up and down arrow keys to select an unused entry line.
3.
Press R to select Revise Entry.
4.
Following the example in the Revise Entry window of the
DIALING DIRECTORY screen shown, type the required data.
5.
Press
6.
Press
Note:
[ Enter ] [ Enter ]
to save the entry to the PC hard disk. again to dial ATTMAIL.
Once a connection is established, CONNECT 2400 flashes on the screen and the Terminal Mode Screen returns automatically. The connect message indicates that the data call was connected at 2400 bps, which is correct for the example.
7.
Press
[ Enter ]
1.
To disconnect (hang-up) a data call, press
2.
When the call is disconnected, press
DIALING DIRECTORY,
once more to display the ATTMAIL login prompt.
[ Alt ] [ h ].
or press
[ Alt ] [ d ]
[ Alt ] [ x ]
to return to the
to exit to DOS.
DEFINITY Communications System APPENDIX C: APPLICATION NOTES
7400B Data Module
User’s Guide
Page C-5

RELAY GOLD

Configuring the Software

Relay Gold is a data communications software package produced by Relay Communications, Inc. The following procedures are based on release 3.0 of the software package.
1. At the DOS prompt, type
install
2.
Enter your personal computer ID.
3.
Select the letter that corresponds to the Hayes Smartmodem 2400
[ Enter ]
or compatible for port COM1.
Note:
Most of the default configuration values for the Hayes Smartmodem 2400 are appropriate for the 7400B Data Module.
4.
Select the default communication port and speed that will be used
most frequently.
5.
Enter a selection for 3270 emulation board type or leave it at the default of NONE.
6.
Enter a selection for the video display adapter used in your PC.
Press
7.
[ Enter ]
to start Relay Gold.

Placing a Call Directly

RELAY Gold
1.
With the
OFF LINE
menu displayed as shown below, press
select Call a Host.
(c) Copyright 1985, 88 RELAY Communications, Inc. OFFLINE
Your PC ID is: F1 = Call a HOST F2 = Answer a Call From A PC F3 = Review the Directory of Computers F4 = Set Personal Computer Options F6 = Edit a File F7 = Print Files
F8 = Run a Program F9 = Stop Printer or Script
Esc = Exit
F10 = HELP Alt K = More Keys
[ F1 ]
to
APPENDIX C: APPLICATION NOTES DEFINITY Communications System
7400B Data Module
Page C-6
2.
Type the telephone number of the system you want to call, and
User’s Guide
Relay Gold sends the number to the 7400B Data Module to dial the system.
Placing a Call Through the
Directory
COMn Port Number? 1 File Protocol? RL Parity Code? Local Echo? Auto Linefeed? Stop Bits?
Answerback Char? Send LF with CR? Delay After Line? 0 (0-99) Wrap at End of Line?
Review Connect Options for Computer Named: ATTMAIL
RELAY/3270 Model Number: 2
This example uses ATTMAIL as the system to be called.
At the
1.
OFF LINE
menu, press
[ F3 ]
to select the
Directory of Computers option.
2.
At the name field, type
ATTMAIL
3.
Press
[ Tab ]
to move to the
number
field, and then type
9,18006245123
The values used in this example are typical, not actual.
[ Tab ]
to move to the
speed
field, and type
4.
Note:
Press
2400
5.
Press
[ Tab ]
to move to the
type
field, and type
vt100
6.
Press
[ F4 ]
to display the
Named
(1-15)
(R-,N,K,X,XC) Function Key Filename? I (I,N,E,O,M,S,7,8) Translation Filename? N (Y, N) N (Y,N,X)
1 (1,2)
00 (00-FF)
N (Y,N)
screen, as shown below.
Logon Script Filename?
Full or Half Duplex?
Flow Control (XON/XOFF)? N (Y,N,R,X,H) Turnaround Character?
Script Control Char? Show Control Characters? N (Y,N,D)
(press F10 for list)
Review Connect Options for Computer
Review the
IBM3101
F (F, H)
11 (00-FF)
00 (00-FF)
N (Y, N)
Esc = Quit F10 = HELP
DEFINITY Communications System 7400B Data Module User’s Guide

Disconnecting a Call

APPENDIX C: APPLICATION NOTES
7.
Make any necessary changes in the appropriate fields.
8.
Press
[ Enter ]
to save changes to the PC hard disk and display the
Directory of Computers screen.
9.
Use the up and down arrow keys to select the system that you want to call.
10.
Press [ F1 ] to call the system located next to the cursor. Relay
Gold sends the number to the 7400B Data Module to dial the
system.
1.
Press
[ Esc ]
to return to the
ONLINE
menu as shown below.
Page C-7
RELAY Gold
Your PC ID is:
F1 = Return to Terminal Screen
Alt F1 = Redial or Reanswer the Telephone
Alt F2 = Hang up and Return to Main Offline Menu
F3 = Send Files to Another Computer F4 = Receive Files to Your PC F5 = Set Current Connect Options F6 = Edit a File
F7 = Print Files F8 = Run a Program F9 = Stop Printer, File Transfer, or Script
Esc = Return
2.
Press
F10 = HELP
[ Alt ] [ F2 ]
relay.gold
Alt K = More Keys
to disconnect (hang-up) the data call and return to
the OFFLINE menu.
3.
Press
[ F1 ]
or
[ F3 ]
to place another call, or press
DOS.
ONLINE
[ Esc ]
to exit to
APPENDIX C: APPLICATION NOTES
Page C-8
DEFINITY Communications System
7400B Data Module
User’s Guide

CROSSTALK XVI

Configuring the Software

NAme
NUmber
---------
I
SPeed 2400 DAta 8
POrt 1
--------------- Key settings --------------
II
ATten
SWitch Home
------
I
1) AT&T
CROSSTALK defaults (Hayes 2400)
Communications parameters
PArity None ST
Esc
-------
--------------
Crosstalk XVI is a data communications software package produced by Digital Communications Associates.
1.
At the DOS prompt, type
xtalk
[ Enter ]
A title screen is displayed for a few seconds, followed by the
-------
I
OP 1
2) NEWUSER
Status Screen
CROSSTALK - XVI Status Screen
DUplex EMulate None MOde
COmmand ETX (ˆC) BReak
Available command files ---------------------------
3) SETUP
as shown below.
-------­Full
Call
End
I
I I
-------
LOaded
CApture Off
STD
I
------- Filter settings
I
DEbug
TAbex INfilter On
-----SEnd control settings ----
CWait
LWait
4) STD
Off Off
None None
LFauto BLankex OUtfiltr On
-------
Off Off
I
I
I
2.
Choose the number next to the command file SETUP shown on
your Status screen or press the number for Setup and
[ Enter ]
to access the command line, then type LOad SETUP. To continue the
3. Select the letter next to Hayes Smartmodem (all models).
4. Select the letter next to Hayes Smartmodem 2400.
5. Select the COMmunication port to which your data module is
6.
SETUP
program press
[ Enter ].
connected (typically COM 1). Press [ Enter
7.
], and then wait a few seconds as Crosstalk sets up the
7400B Data Module.
again
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX C: APPLICATION NOTES
Select the baud rate that you will use most often.*
8. Select the type of video display used in your PC.*
9.
Y ] to save the new configuration settings to the hard disk of
Press [
10. the PC.
Page C-9
11.
Press
[ Enter ]
to return to the Status Screen.

Placing a Call To create a command file for a computer system that you want to call for

the first time, use the NEWUSER script file.
1.
Enter the number next to the command file NEWUSER shown on
your Status screen.
2.
Enter the letter next to the service you want to call or enter O for “Other Service not listed above.” See the sample screen below.
Choose a service to set up:
AT&T Mail
A-
CompuServe
B-
Delphi
C-
Dow Jones News / Retrieval
D-
LEXIS/NEXIS
E-
MCI MAIL
F-
Newsnet
G-
Official Airline Guide
H-
Source
I-
VU/TEXT
J-
A system running Remote2 Host or R2LAN Host
K-
Another PC running Crosstalk or Transporter
L-
Other service not listed above
O-
Exit from this program
X-
Please choose a service:_
* These options may not be available on earlier versions of Crosstalk.
APPENDIX C: APPLICATION NOTES
Page C-10
3.
For a listed service:
Enter the telephone number (for example, 5551234 or
a.
9,5551234).
b.
Enter the baud rate (for example, 300, 1200, 2400). Enter any other parameters required for that specific service
c.
(such as login, password, account number).
d.
Enter
For a service not listed:
4. Enter the telephone number (for example, 18006245123 or
a.
9,18006245123). Enter the system name you are calling (for example,
b.
ATTMAIL). Enter the baud rate (for example, 300, 1200, 2400).
c.
DEFINITY Communications System
[ Y ]
when you are asked to make the call.
7400B Data Module
User’s Guide

Disconnecting a Call

Y ] to save this setup to the hard disk on the PC for
Enter [
d.
future use. Enter a filename for this setup (typically, the system you are
e.
calling).
Y ] when asked to make the call.
Enter [
f.
Press
g.
[ Enter ];
Crosstalk sends the number to the 7400B Data
Module to dial the system.
Press
1.
2.
[ Esc ].
At the Command? line, type
bye
[ Enter ]
to disconnect from the other computer.
3.
At the Command? line, type
quit
[ Enter ]
to exit Crosstalk and return to DOS.
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX D: QUICK-REFERENCE SUMMARIES
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-1
This appendix contains quick-reference summaries for the following data:
●
AT Command Set
●
S-Registers
●
Result Codes
●
Factory-Default Configuration
●
EIA-232-D Pin Assignments
●
ASCII Character Set
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-2
DEFINITY Communications System
7400B Data Module
User’s Guide
Command
AT A A/ D E0
E1
H0 H1
I0 I1 I2
O
Q0
Q1
r Set pointer to S-register r.
S S
r=n
S
?
r
Description
Command prefix—precedes most commands. Go off hook and remain in command state. Repeat the last command line. Enter originate mode and dial number that follows. Inhibit command state echo.
Enable command state echo. Go on-hook (hang up).
Accepted but causes no action. Returns decimal number 249 to data terminal.
Returns ROM checksum as two 4-digit hexadecimal numbers. Returns OK.
Return to on-line mode. Enable display of result codes.
Disable display of result codes.
Set S-register r to value n. Display value stored in S-register r.
V0 Display short form (numeric) result codes.
V1
X1 X2
X3
X4
Z0 Z1
Display verbose form (text) result codes. Enables features of result codes 0-4.
Enables features of result codes 0-5, 10-12, 14. Enables features of result codes 0-6, 10-12, 14. Enables features of result codes 0-7, 10-12, 14.
Reset and recall stored configuration profile 0.
Reset and recall stored configuration profile 1.
(more)
TABLE D-1 AT COMMAND SET
DEFINITY Communications System
7400B Data Module
User’s Guide
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-3
Command
&C0
&C1
&D0
&D1
&D2
&D3 &F
&S0
&S1
&T0 &Tl
&T2 &T3
&T4
&T5
&T6 &T7 &T8
Description
Maintain DCD circuit in ON state.
DCD circuit operates according to EIA-232-D specification.
Ignore DTR signal.
Return to command mode if ON/OFF transition of DTR is
detected; active call is not disconnected.
Return to command mode if ON/OFF transition of DTR is
detected; active call is disconnected.
Perform reset if ON/OFF transition of DTR is detected.
Recall factory-default configuration profile.
Maintain DSR circuit in on state. DSR circuit operates according to EIA-232-D specification.
Terminate any test in progress. Initiate local digital loopback test. Same as &T1. Initiate local data loopback test. Allow remote digital loopback request from remote endpoint. Deny remote digital loopback requests from remote endpoint. Initiate remote digital loopback test. Initiate remote digital loopback test with self-test.
Initiate local digital loopback test with self-test. &V &W0
&W1 &Y0
&Y1 &Z0
&Z1 &Z2 &Z3
Display active and stored configuration profiles.
Store active configuration profile in location 0.
Store active configuration profile in location 1.
Recall configuration profile stored in location 0 at start-up.
Recall configuration profile stored in location 1 at start-up.
Store the following telephone number in location 0.
Store the following telephone number in location 1.
Store the following telephone number in location 2.
Store the following telephone number in location 3.
TABLE D-1 AT COMMAND SET (Contd.)
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-4
DEFINITY Communications System
7400B Data Module
User’s Guide
Register
S0 S1 S2 S3 S4
S5 S6 S7 S8 S9
S10 S11 S12 S13 S14
S15 S16 S17 S18 S19
S20 S21 S22 S23 S24
S25 S26 S27
Description
Ring to answer on. Incoming ring count. Escape sequence character. Carriage return character. Line feed character.
Back space character. Not used. Wait time for call completion. Not used. Not used.
Delay between lost line signal and hang up. Not used. Escape sequence guard time. Not used. Bit mapped options (see Appendix B).
Not used. Test function status (see Appendix B). Not used.
Diagnostic test duration timer.
Not used. Not used.
Bit mapped options (see Appendix B). Bit mapped options (see Appendix B). Bit mapped options (see Appendix B). Not used.
DTR change detect time. Not used. Not used.
Range/Unit
000-255 count 000-255 count 000-127 ASCII 000-127 ASCII
000-127 ASCII 000-032, 127 ASCII
— 001-055 sec.
— —
000-255 0.1 sec. —
000-255 0.02 sec.
— 00-FF hex.
— 00-FF hex.
— 000-255 sec.
—
—
00-FF hex. 00-FF hex. 00-FF hex.
— 000-255 0.01 sec.
— —
TABLE D-2 S-REGISTER SUMMARY
DEFINTY Communications System
7400B Data Module
User’s Guide
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-5
Verbose Form
OK CONNECTED
RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 19200
Numeric
0 1
2 3 4 5 6 7 10 11 12 14
Description
Command accepted Connection made at 300 bps
Note: If command X1 is in effect, CONNECT
means connection made at whatever
speed both ends of the call agreed upon.
Ring signal detected Carrier signal not detected or lost Error in command line Connection made at 1200 bps
No dial tone detected Busy signal detected Connection made at 2400 bps Connection made at 4800 bps Connection made at 9600 bps Connection made at 19200 bps
TABLE D-3 RESULT CODES
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-6
DEFINITY Communications System
7400B Data Module
User’s Guide
Parameter
Command state echo Communication mode Default user profile
DCD circuit option DSR circuit option DTR circuit option
Not used by 7400B Data Module Not used by 7400B Data Module Not used by 7400B Data Module
RDL request Result codes Result code format
Result code subset Not used by 7400B Data Module Not used by 7400B Data Module
Not used by 7400B Data Module Not used by 7400B Data Module Not used by 7400B Data Module
(more)
Value
enabled asynchronous
profile 0
always on always on DTR ignored
—
—
—
granted enabled text
0-7,10-12,14 —
— —
—
—
AT Command
E1 &M0/&Q0 &Y0
&C0 &S0 &D0
&G0 Y0 &P0
&T4 Q0 V1
X4 &R0 M1
L2 B1 &J0
TABLE D-4 FACTORY-DEFAULT CONFIGURATION
DEFINITY Communications System APPENDIX D: QUICK-REFERENCE SUMMARIES 7400B Data Module User’s Guide
Page D-7
Parameter
Auto-answer on ring Backspace character Carriage return character
Not used by 7400B Data Module Not used by 7400B Data Module Not used by 7400B Data Module
DTR detection Escape sequence character
Value S-Register
disabled ASCII 8 ASCII 13
— — —
0.05 sec. ASCII 43
Escape sequence guard time 1 sec. Hang up after lost carrier 1.4 sec.
Line feed character Ring count
Not used by 7400B Data Module Test timer duration Wait for call completion
Not used by 7400B Data Module
ASCII 10 0 rings
— 0 sec.
30 sec. —
TABLE D-4 FACTORY-DEFAULT CONFIGURATION (Contd.)
S0=0
S5=8 S3=13
S9=6 S8=2 S11=95
S25=5
S2=43 S12=50
S10=14
S4=10 S 18=0
S26=1 S18=0 S7=30
S6=2
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-8
DEFINITY Communications System
7400B Data Module
User’s Guide
Pin
1 2 3 4 5
6 7 8 9
10
11
12* CI 13 14 15
16 17
18
19
20
21
22 23*
24
25
Circuit
— BA (SD)
BB (RD)
CA (RTS) CB (CTS)
CC (DSR) AB (SG)
CF (RLSD)
—
—
—
—
—
—
—
—
— —
CD (DTR) —
CE (RI) CI
— —
Direction
— to 7400B
from 7400B to 7400B from 7400B
from 7400B common from 7400B
— —
— from 7400B
— — —
— — — —
to 7400B —
from 7400B from 7400B — —
Function
not used transmit data receive data request to send clear to send
data set ready signal ground
receive line signal detector not used not used
not used
data signal rate select
not used
not used
not used
not used
not used
not used
not used
data terminal equipment ready
not used
ring indicator
data signal rate select
not used
not used
*CI on pin 12 is Bell 212A, on pin 23 is EIA-232-D
TABLE D-5 EIA-232-D PIN ASSIGNMENTS
DEFINITY Communications System 7400B Data Module User’s Guide
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-9
ASCII CONTROL VALUE
000 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030
031
CHARACTER
NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF
VT FF CR SO
SI DLE DC1
DC2
DC3
DC4
NAK
SYN ETB CAN EM
SUB ESC
FS GS
RS
US
KEY
Ctrl-@ Ctrl-A Ctrl-B Ctrl-C Ctrl-D Ctrl-E Ctrl-F Ctrl-G Ctrl-H Ctrl-I Ctrl-J Ctrl-K Ctrl-L Ctrl-M Ctrl-N Ctrl-O Ctrl-P Ctrl-Q Ctrl-R Ctrl-S Ctrl-T Ctrl-U Ctrl-V Ctrl-W Ctrl-X Ctrl-Y Ctrl-Z Ctrl-[ Ctrl-\ Ctrl-] Ctrl-^ Ctrl-_
ASCII CONTROL VALUE CHARACTER
032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 047 048 049 050 051 052 053 054 055 056 057 058 059 060 061 062
063
KEY
spacebar !
" # $
% &
'
(
)
* +
,
­.
/ 0 1
2 3 4 5 6 7 8 9
: ;
<
=
>
?
(more)
TABLE D-6 ASCII CHARACTER SET
APPENDIX D: QUICK-REFERENCE SUMMARIES
Page D-10
DEFINITY Communications System
7400B Data Module
User’s Guide
ASCII CONTROL VALUE
CHARACTER
064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079 080 081 082 083 084 085 086 087
088 089 090 091 092 093 094 095
KEY
@ A
B C D E F G H I J K L M N O P
Q R
S T
U V W X Y Z
[ \ ]
^ —
ASCII CONTROL VALUE
CHARACTER
096 097 098
099 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
DEL
KEY
‘ a
b c d e f
g h
i
j k l m n o
p q
r s t u v w x
y z
{
I
} ˜
Delete
TABLE D-6 ASCII CHARACTER SET (Contd.)
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