Measurement Digital232 User Manual

the smart approach to instrumentation

™

IOtech, Inc.

25971 Cannon Road Cleveland, OH 44146

Phone: [phone] Fax: [phone]

E-mail: [e-mail] Internet: http://www.iotech.com

Digital232 User’s Manual

p/n DIGITAL232-901 Rev 2.0

©1998 by IOtech, Inc.

Printed in the United States of America

Warranty Information

Your IOtech warranty is as stated on the product warranty card. You may contact IOtech by phone,
fax machine, or e-mail in regard to warranty-related issues.
Phone: [phone], fax: [phone], e-mail: [e-mail]

Limitation of Liability

IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this product.

Copyright, Trademark, and Licensing Notice

All IOtech documentation, software, and hardware are copyright with all rights
reserved. No part of this product may be copied, reproduced or transmitted by
any mechanical, photographic, electronic, or other method without IOtech’s prior
written consent. IOtech product names are trademarked; other product names, as
applicable, are trademarks of their respective holders. All suppli ed IOtech
software (including miscellaneous support files, drivers, and sample programs)
may only be used on one installation. You may make archival backup copies.

FCC Statement

IOtech devices emit radio frequency energy in levels compliant with Federal Communications Commission rules (Part 15)
for Class A devices. If necessary, refer to the FCC booklet How To Identify and Resolve Radio-TV Interference Problems
(stock # 004-000-00345-4) which is available from the U.S. Government Printing Office, Washington, D.C. 20402.

CE Notice

Many IOtech products carry the CE marker indicating they comply with the safety and emissions standards of the
European Community. As applicable, we ship these products with a Declaration of Conformity stating which
specifications and operating conditions apply.

Warnings, Cautions, Notes, and Tips

Refer all service to qualified personnel. This caution symbol warns of possible personal injury or equipment damage
under noted conditions. Follow all safety standards of professional practice and the recommendations in this manual.
Using this equipment i n ways other than described in this manual can present serious safety hazards or cause equipment
damage.

This ESD caution symbol urges proper handling of equipment or components sensitive to damage from electrostatic
discharge. Proper handling guidelines include the use of grounded anti-static mats and wrist straps, ESD-protective
bags and cartons, and related procedures.

Specifications and Calibration

Specifications are subject to change without notice. Significant changes will be addressed
in an addendum or revision to the manual. As applicable, IOtech calibrates its hardware to
published specifications. Periodic hardware calibration is not covered under the warranty
and must be performed by qualified personnel as specified in this manual. Improper
calibration procedures may void the warranty.

Quality Notice

IOtech has maintained ISO 9001 certification since 1996. Prior to shipment, we thoroughly test our products and
review our documentation to assure the highest quality in all aspects. In a spirit of continuous improvement, IOtech
welcomes your suggestions.

Table of Contents

Section1 INTRODUCTION Page

1.1 General Description 1.1

1.2 Available Accessories 1.2

1.3 Specifications 1.3

Section 2 GETTING STARTED Page

2.1 Inspection 2.1

2.2 Configuration 2.2

2.2.1 Serial Baud Rate Selection 2.3

2.2.2 Xon/Xoff Serial Control 2.5

2.2.3 Serial Word Length Selection 2.5

2.2.4 Serial Stop Bit Selection 2.6

2.2.5 Serial Terminator Selection 2.6

2.2.6 Serial Echo Selection 2.7

2.2.7 Serial Parity Selection 2.7

2.3 Digital I/O Ports 2.8

2.3.1 Logic Levels 2.8

2.3.2 Digital I/O Port Pinout 2.8

2.3.3 Control Lines 2.10

2.3.3.1 Clear 2.10

2.3.3.2 Data Strobe 2.10

2.3.3.3 External Data Ready 2.11

2.3.3.4 Inhibit 2.11

2.3.3.5 Trigger 2.12

2.3.3.6 Service Input 2.13

2.4 Installation 2.13

2.5 Errors 2.14

Table of Contents

Section 3 COMMAND DESCRIPTIONS Page

@ Reset 3.2
An Bit Set 3.3
Bn Bit Clear 3.4
Cn Configure 3.5
Dn…Z Data 3.6
Fn Format 3.7
Gn Output Select 3.12
Hn Handshake 3.13
In Invert 3.14
Mn Service Request (SRQ) 3.15
Pn Port 3.16
Qn Inhibit 3.17
Rn Data ready 3.18
Tn Test 3.19
Un Status 3.20
X Execute 3.24
Yn Terminator 3.25

Section 4 SERVICE INFORMATION Page

4.1 Factory Service 4.1

4.2 Digital232 Component Layout 4.2

4.3 Digital232 Parts List 4.3

Appendix A Digital232 Command Summary
Appendix B ASCII Character Codes
Appendix C IBM PC Interfacing

A.1
B.1
C.1

Section 1 Introduction

Introduction

1.1 General Description

The

Digital232

unit has 40 TTL level digital I/O lines, divided into five 8-bit ports. Each port is
software programmable as input or output.

The

Digital232

trigger output signal can be asserted on a Trigger command. Edge-triggered inputs
can generate a Service Request to the RS-232 host. Five data formats are software
programmable, including hexadecimal, ASCII, binary, high speed binary and decimal.
There are also individual bit set and bit clear commands.

A status mode enables the host to interrogate the programmed status of the

Digital232

RAM and ROM operation.

When data is requested, the
ports, all output ports, or from a specific 8 bit port. When being programmed, the unit
will input data and programming information from the host, and output the data to the
selected I/O port.

at any time. A self-test is initiated at power-on which checks for proper

is a digital input and output interface to the RS-232 standard. The

has several features which give it versatile interface capability. A

Digital232

will output from all forty bits, all input

1.1

Section 1 Introduction

1.2 Available Accessories

Additonal accessories that can be ordered for the

CN-6-50
109-0920
CA-11

50 Pin solder tab edge connector.
Instruction Manual
12 ft. RS-232 cable, compatible with IBM PCs or

Digital232

include...

similar computers.

CA-8-50

6 foot, 50 conductor ribbon cable with a card edge

connector on one end, the other end unterminated.

CA-8-50

1.2

Section 1 Introduction

1.3 Specifications DIGITAL I/O:

Configuration: Five 8 bit ports, programmable as inputs or outputs.

Also included are programmable handshake lines, data

latching capability, and trigger output.
Logic Levels: Outputs will drive 2 TTL loads.
Connector: I/O Port: One 50 pin card-edge. Mating connector

supplied.

SERIAL INTERFACE:

EIA RS-232C: AB, BA, BB, CA, CB
Duplex: Full with switch selectable echo/no-echo
Data Bits: 7 or 8 (switch selectable)
Stop bits: 1 or 2 (switch selectable)
Parity: Switch selectable on transmit for odd, even,

mark, space or disabled. No parity test on receive
Baud Rates: 110, 135, 150, 300, 600, 1200, 1800, 2400, 3600,

4800, 7200, 9600, and 19200 (switch selectable)
Terminator: Switch selectable CR, LF, CR-LF, or LF-CR
Control: Supports Clear To Send (CTS), Request To Send

(RTS) and switch selectable XON/XOFF
Serial I/O Buffers: 3500 Characters each
Serial Connectors: Mates with a 25-Pin Sub-D male: DCE configured.

GENERAL:

Indicators: LEDs for Send, Receive, Test, Error, and Power
Power: 105-125V or 210-250V,50, 60 Hz; 15 VA MA X.
Environment: 0 to 50 deg C; 0 to 70% RH
Dimensions: 188mm deep x 140mm wide x 68mm high. (7.39" x

5.5" x 2.68")
Weight: 1.55 kg (3.6 lbs)
Controls: Power switch, internal dip switch for RS-232

parameters

Supplied Accessories: I/O port connector, power supply and manual.

Specifications are subject to change without notice.

1.3

Section 2 Getting Started

GETTING STARTED

2.1 INSPECTION

The

Digital232

to shipment. When you receive the interface, carefully unpack all items from the
shipping carton and check for any obvious signs of physical damage which may have
occurred during shipment. Immediately report any such damage found to the shipping
agent. Remember to retain all shipping materials in the event that shipment back to the
factory becomes necessary.

Every

2.2 CONFIGURATION

interface. NOTE: Most selectable functions are read ONLY at power-on and should
only be set prior to applying power to the interface. The following figures illustrate
the factory default conditions which are:

Digital232

•

•

•

•

Two DIP switches internal to the

was carefully inspected, both mechanically and electrically, prior

is shipped with the following....

Digital232
109-0920
CN-6-50
TR-2
TR-2E

Digital I/O Interface

Instruction Manual
50 pin card edge connector
115 volt Power Supply or
220 volt Power Supply

Digital232

set the configuration of the

9600 Baud
8 Data Bits
2 Stop Bits
No Parity
Xon/Xoff Disabled
Echo Disabled
Serial Terminator = CR Only

2.1

Section 2 Getting Started

S1 Factory Default Settings

S2 Factory Default Settings

2.2

Section 2 Getting Started

Switch S1 is the 8-position dip switch close to the front of the unit. Switch S2 is
near the rear power switch. To modify any of these defaults, follow this simple
procedure:

Disconnect the power supply from the AC line and from the interface.

Disconnect any digital I/O or serial cables prior to disassembly.

WARNING

Never open the

Digital232

case while it is connected to
the AC line. Failure to observe this warning may result
in equipment failure, personal injury or death.

Remove the four screws located in each corner of the rear panel. Hold the
case firmly and pull the rear panel outward, noting the slot location of the main
circuit board. Modify those parameters which are appropriate for your
installation and reassemble the unit. Slide the main circuit board into the
previously noted slot and finish reassembly by tightening the four screws into
the rear panel.

2.2.1 Serial Baud Rate Selection

S1-1 through S1-4 determine the serial baud rate. The factory default is 9600
baud. The baud rate may be selected from 110 to 19200. (Switch S1 is located near
the front of the interface)

2.3

Section 2 Getting Started

S1 View for Serial Baud Rate Selection

2.4

Section 2 Getting Started

2.2.2 Xon/Xoff Serial Control Selection

Switch S1-5 is used to enable

Digital232

issues

when its serial input buffer is near full. When it is able to

Xoff

accept more information, it issues

Xon/Xoff

. The

Xon

serial control. When enabled, the

Digital232

transmit from the serial device it is communicating with.

When the

Xon/Xoff

set to +5 volts, and the

Digital232

default is

should be wired to the

Xon/Xoff

disabled.

S1 View for Xon/Xoff Serial Control

mode is enabled, the

input is ignored. However, the

CTS

+Vtest

to avoid any problems. The factory

output from the

RTS

also accepts

CTS

Xon/Xoff

on

Digital232

input to the

is

2.2.3 Serial Word Length Selection

S1-6 determines the number of bits per each serial character transmitted or
received. The factory default is 8 data bits.

S1 View of Serial Word Length (Data Bits)

2.5

Section 2 Getting Started

2.2.4 Serial Stop Bit Selection

Switch SW1-8 determines the number of stop bits contained in each serial
character transmitted and received. The factory default is 2 stop bits.

SW1 View for Serial Stop Bit Selection

2.2.5 Serial Terminator Selection

S2-3 and S2-4 select the serial terminators for the serial input and output. The
factory default is

. (switch S2 is located near the rear power switch).

CR

S2 View for Serial Terminator

2.6

Section 2 Getting Started

2.2.6 Serial Echo Selection

Serial data sent to the

Digital232

will be echoed back to the serial host if S2-5

is set to the open position. Factory default is Echo Disabled.

S2 View for Echo

2.2.7 Serial Parity Selection

Serial Parity is selected with S2-6 through S2-8. The

Digital232

generates the
selected parity during serial transmissions but it does not check parity on data
received. The factory default is parity disabled.

S2 View for Serial Parity Selection

2.3 Digital Input/Output Ports

The

Digital232

has 40 data lines which can be programmed in groups of 8 as

2.7

Section 2 Getting Started

either input or output. At power on, all 40 bits are in the input mode. Each 8 bit
group is one port, beginning with

Port 1

as the least significant 8 bits, and

Port 5

as

the most significant 8 bits.

2.3.1 Logic Levels

The data and handshake output lines will drive two TTL loads. In addition,

ports 3, 4, and 5 outputs are 5 Volt CMOS compatible. All input lines are less than

1.5 TTL loads. All inputs are protected against damage due to high static voltages.
Normal precautions should be taken to limit the input voltages to -0.3 to +7.0 volts.
All I/O lines are referenced to

COMMON

(Pin 50).

2.3.2 Digital I/O Port Pinout (rear view)

The following diagram illustrates the digital I/O edge connector as view from

the rear of the

Digital232

2.8

Section 2 Getting Started

Pin Description

1 thru 8

9 thru 16

17 thru 24

25 thru 32

33 thru 40

41

DATA PORT1

(Input or Output).
Pin 1 is bit 1 (LSB), Pin 8 is bit 8 (MSB).
Least Significant Port

DATA PORT2

(Input or Output).
Pin 9 is bit 1 (LSB), Pin 16 is bit 8 (MSB).

DATA PORT3

(Input or Output).
Pin 17 is bit 1 (LSB), Pin 24 is bit 8 (MSB).

DATA PORT4

(Input or Output).
Pin 25 is bit 1 (LSB), Pin 32 is bit 8 (MSB).

DATA PORT5

(Input or Output).
Pin 33 is bit 1 (LSB), Pin 40 is bit 8 (MSB).
Most Significant Port

CLEAR

(Output).
42
43
44
45
46

DATA STROBE
TRIGGER
INHIBIT
SERVICE INPUT
EXTERNAL DATA READY [EDR]

47,48 Not used.
49
50

+5 Volts
I/O COMMON.

(Output).

(Output).

(Output).

(Input).

(

Do not exceed 50 mA load

(Input).

).

2.9

Section 2 Getting Started

2.3.3 Control Lines

Five control lines enable handshaking of digital I/O data transfer to the

Digital232

and can also be independently activated with the

. They are automatically activated with the corresponding I/O activity

Handshake (Hn)

command.

2.3.3.1 Clear

The

Clear

(Pin 41)

output is pulse for approximately 50 microseconds at power-on,
or upon receipt of the
active high. The

Handshake

command

Invert

operations.

2.3.3.2 Data Strobe

TIMING DIAGRAM FOR CLEAR OUTPUT

(Pin 42)

RESET (@

) command. The

Clear

line is normally

command (I8) will program it active low. The

(H0)

can pulse the

Clear

line, independent of any I/O

The

Data Strobe

new data is output on the I/O port. The

output is pulse for approximately 50 microseconds after

Data Strobe

high but may be programmed active low by the

Handshake

command

can pulse the

(H1)

Data Strobe

I/O operations.

2.10

line is normally active

Invert

command (I4). The

line, independent of an