National Instruments GPIB-232CT User manual

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© Copyright 1988, 1992 National Instruments Corporation.
All Rights Reserved.
GPIB-232CT
User Manual
MicroGPIB®
RS-232 to IEEE-488 Controller
July 1992 Edition
Part Number 320114-01

National Instruments Corporate Headquarters
6504 Bridge Point Parkway
Austin, TX 78730-5039
[phone]
(800) IEEE-488 (toll-free U.S. and Canada)
Technical support fax: [phone]
Branch Offices:
Australia 03 879 9422, Belgium 02 757 00 20, Canada 519 622 9310,
Denmark 45 76 73 22, France 1 48 65 33 70, Germany 089 714 5093,
Italy 02 48301892, Japan 03 3788 1921, Netherlands 01720 45761,
Norway 03 846866, Spain 91 896 0675, Sweden 08 984970,
Switzerland 056 45 58 80, U.K. 0635 523 545

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MicroGPIB Products
National Instruments has developed the MicroGPIB product line to offer a
series of high performance, low cost IEEE-488 support items, packaged in
small all-metal cases, capable of being rack mounted.
Limited Warranty
The GPIB-232CT is warranted against defects in materials and
workmanship for a period of two years from the date of shipment, as
evidenced by receipts or other documentation. National Instruments will, at
its option, repair or replace equipment that proves to be defective during the
warranty period. This warranty includes parts and labor.
A Return Material Authorization (RMA) number must be obtained from the
factory and clearly marked on the outside of the package before any
equipment will be accepted for warranty work. National Instruments will
pay the shipping costs of returning to the owner parts which are covered by
warranty.
National Instruments believes that the information in this manual is
accurate. The document has been carefully reviewed for technical
accuracy. In the event that technical or typographical errors exist, National
Instruments reserves the right to make changes to subsequent editions of
this document without prior notice to holders of this edition. The reader
should consult National Instruments if errors are suspected. In no event
shall National Instruments be liable for any damages arising out of or
related to this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN,NATIONAL INSTRUMENTS MAKES NO
WARRANTIES,EXPRESS OR IMPLIED,AND SPECIFICALLY DISCLAIMS
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.CUSTOMER'S RIGHT TO RECOVER DAMAGES
CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL
INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE
PAID BY THE CUSTOMER.NATIONAL INSTRUMENTS WILL NOT BE
LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA,PROFITS,USE
OF PRODUCTS,OR INCIDENTAL OR CONSEQUENTIAL DAMAGES,EVEN
IF ADVISED OF THE POSSIBILITY THEREOF. This limitation of the
liability of National Instruments will apply regardless of the form of action,
whether in contract or tort, including negligence. Any action against

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!
National Instruments must be brought within one year after the cause of
action accrues. National Instruments shall not be liable for any delay in
performance due to causes beyond its reasonable control. The warranty
provided herein does not cover damages, defects, malfunctions, or service
failures caused by owner's failure to follow the National Instruments
installation, operation, or maintenance instructions; owner's modification of
the product; owner's abuse, misuse, or negligent acts; and power failure or
surges, fire, flood, accident, actions of third parties, or other events outside
reasonable control.
Copyright
Under the copyright laws, this book may not be copied, photocopied,
reproduced, or translated, in whole or in part, without the prior written
consent of National Instruments Corporation.
Trademarks
MicroGPIB® is a trademark of National Instruments Corporation.
Product names listed are trademarks of their respective manufacturers.
Company names listed are trademarks or trade names of their respective
companies.

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FCC/DOC Radio Frequency Interference Compliance
This equipment generates and uses radio frequency energy and, if not
installed and used in strict accordance with the instructions in this manual,
may cause interference to radio and television reception. This equipment
has been tested and found to comply with (1) the limits for a Class A
computing device, in accordance with the specifications in Subpart J of Part
15 of U.S. Federal Communications Commission (FCC) Rules, and (2) the
limits for radio noise emissions from digital apparatus set out in the Radio
Interference Regulations of the Canadian Department of Communication
(DOC). These regulations are designed to provide reasonable protection
against interference from the equipment to radio and television reception in
commercial areas.
There is no guarantee that interference will not occur in a particular
installation. However, the chances of interference are much less if the
equipment is used according to this instruction manual.
If the equipment does cause interference to radio or television reception,
which can be determined by turning the equipment on and off, one or more
of the following suggestions may reduce or eliminate the problem.
• Operate the equipment and the receiver on different branches of your
AC electrical system.
• Move the equipment away from the receiver with which it is
interfering.
• Relocate the equipment with respect to the receiver.
• Reorient the receiver's antenna.
• Be sure that the equipment is plugged into a grounded outlet and that
the grounding has not been defeated with a cheater plug.
If necessary, consult National Instruments or an experienced
radio/television technician for additional suggestions. The following
booklet prepared by the FCC may also be helpful: How to Identify and
Resolve Radio-TV Interference Problems. This booklet is available from
the U.S. Government Printing Office, Washington, DC 20402, Stock
Number 004-000-00345-4.

© National Instruments Corp. vii GPIB-232CT User Manual
Preface
The GPIB-232CT User Manual describes the features, functions, and
operation of the Product. The GPIB-232CT is one of National Instruments
family of MicroGPIB products. These products are high-performance, low-
cost IEEE-488 support items, packaged in small all-metal cases, capable of
being rackmounted.
Organization of the GPIB-232CT User Manual
The GPIB-232CT User Manual is organized as follows:
Chapter 1, Description of the GPIB-232CT, contains general information
about the National Instruments GPIB-232CT, the IEEE-488 bus, and the
RS-232 port. This chapter also lists all components and accessories as well
as provides electrical, environmental, and physical specifications.
Chapter 2, The GPIB-232CT Modes of Operation, explains the two modes
of operation of the GPIB-232CT.
Chapter 3, Installation and Configuration in S Mode, contains the S mode
installation and configuration steps.
Chapter 4, Programming in S Mode, explains how to program the
GPIB-232CT when operating in S mode.
Chapter 5, S Mode Functions, gives a detailed description of each S mode
function. The functions are arranged in alphabetical order and each
contains the syntax, purpose, and examples.
Chapter 6, Installation and Configuration in G Mode, contains the G mode
installation and configuration steps.
Chapter 7, Programming in G Mode, explains how to program the
GPIB-232CT when operating in G mode.
Chapter 8, G Mode Functions, gives a detailed description of each G mode
function. The functions are arranged in alphabetical order and each
contains the syntax, purpose, and examples.

Preface
GPIB-232CT User Manual viii © National Instruments Corp.
Appendix A, Multiline Interface Messages, contains an ASCII chart, and a
list of the corresponding GPIB messages.
Appendix B, Status Information, contains explanations of status bits, GPIB
error codes, and serial port error codes.
Appendix C, The Serial Connection, explains the RS-232 serial standard
and contains information for building a serial cable.
Appendix D, Operation of the GPIB, describes the operation of the GPIB.
Appendix E, Common Questions, provides answers to common questions
that frequently arise.
Appendix F, Parallel Polling, explains the use and operation of Parallel
Polls.
Appendix G, Setting Switches, gives additional details about setting
switches on the GPIB-232CT.
Appendix H, Sample Programs, provides some S mode and G mode sample
programs.
Conventions Used in This Manual
Throughout this manual, the following conventions are used to distinguish
elements of text:
italic Italic text denotes emphasis, a cross reference, or
an introduction to a key concept.
monospace Text in this font denotes text or characters that
are to be literally input from the keyboard,
sections of code, programming examples, syntax
examples, and names of variables.
boldface Bold text in this manual denotes a signal name, a
front panel LED indicator, or onscreen module
responses.

Preface
© National Instruments Corp. ix GPIB-232CT User Manual
<> Angle brackets enclose the ASCII character
symbols for certain keystrokes. For example,
<CR> for carriage return and <LF> for linefeed.
Abbreviations
The following abbreviations are units of measure that are used in the text of
this manual.
A ampere
C Celsius
° degree
> greater than
• greater than or equal to
hex hexadecimal
Hz hertz
in. inch
K 1,024
kbytes/sec 1000 bytes per second
< less than
• less than or equal to
m meter
M 1,048,576
Mbytes/sec 1,000,000 bytes per second
mA milliampere
mm millimeter
oz. ounce
% percent
sec second
V volt
VAC volts alternating current
VDC volts direct current

Preface
GPIB-232CT User Manual x © National Instruments Corp.
Customer Communication
We appreciate communicating with the people who use our products. If
you encounter any technical problems, you can use the following toll-free
number between the hours of 8:00 a.m. and 5:30 p.m. (central time) to
reach the National Instruments applications engineering department:
[phone]
(800) IEEE-488 (toll-free U.S. and Canada)
For your documentation comments, we have included a User Comment
Form at the back of the manual. Please mail it to the address printed at the
bottom of the form.