National Instruments GPIB-120A Bedienungsanleitung

GPIB-120A

User Manual

October 1994 Edition

Part Number 370893A-01

National Instruments Corporate Headquarters

6504 Bridge Point Parkway

Austin, TX 78730-5039

(512) 794-0100

Technical support fax: (800) 328-2203

(512) 794-5678

Branch Offices:

Australia (03) 879 9422, Austria (0662) 435986, Belgium 02/757.00.20, Canada (Ontario) (519) 622-9310,

Canada (Québec) (514) 694-8521, Denmark 45 76 26 00, Finland (90) 527 2321, France (1) 48 14 24 24,

Germany 089/741 31 30, Italy 02/48301892, Japan (03) 3788-1921, Mexico 95 800 010 0793,

Netherlands 03480-33466, Norway 32-84 84 00, Singapore 2265886, Spain (91) 640 0085, Sweden 08-730 49 70,

Switzerland 056/20 51 51, Taiwan 02 377 1200, U.K. 0635 523545

Limited Warranty

The GPIB-120A 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 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.

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or

mechanical, including photocopying, recording, storing in an information retrieval system, or translating, in whole

or in part, without the prior written consent of National Instruments Corporation.

Trademarks

Product and company names listed are trademarks or trade names of their respective companies.

WARNING REGARDING MEDICAL AND CLINICAL USE

OF NATIONAL INSTRUMENTS PRODUCTS

National Instruments products are not designed with components and testing intended to ensure a level of reliability

suitable for use in treatment and diagnosis of humans. Applications of National Instruments products involving

medical or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on

the part of the user or application designer. Any use or application of National Instruments products for or involving

medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all

traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent

serious injury or death should always continue to be used when National Instruments products are being used.

National Instruments products are NOT intended to be a substitute for any form of established process, procedure, or

equipment used to monitor or safeguard human health and safety in medical or clinical treatment.

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 the following two regulatory agencies:

Federal Communications Commission

This device complies with Part 15 of the Federal Communications Commission (FCC) Rules for a Class A digital

device. Operation is subject to the following two conditions:

1. This device may not cause harmful interference in commercial environments.

2. This device must accept any interference received, including interference that may cause undesired operation.

Canadian Department of Communications

This device complies with the limits for radio noise emissions from digital apparatus set out in the Radio

Interference Regulations of the Canadian Department of Communications (DOC).

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils

numériques de classe A prescrites dans le règlement sur le brouillage radioélectrique édicté par le ministère des

communications du Canada.

Instructions to Users

These regulations are designed to provide reasonable protection against harmful interference from the equipment to

radio reception in commercial areas. 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.

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 installed and 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.

• Reorient or relocate 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.

Notice to user: Changes or modifications not expressly approved by National Instruments could void the user’s

authority to operate the equipment under the FCC Rules.

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.

Danger

The GPIB-120A does not generate high voltages; however, you must use extreme caution

if your system or application can cause high voltages on the shield or logic ground of the

GPIB cable you attach to the electrically isolated connector (GPIB Port B) located on the

rear panel of the GPIB-120A. Many GPIB cables use a metal shell to enclose the GPIB

piggyback connectors. This metal shell is normally connected to the cable shield.

Therefore, if the shield is at a high potential with respect to the chassis ground of the

GPIB-120A, the high voltage is also present, in most cases, on the cable connector

housing.

The chassis, back panel, and front panel of the GPIB-120A are electrically connected to

the earth ground pin of the AC power connector on the back panel. If the AC wiring in

your building is installed correctly, you can safely operate the GPIB-120A. Because the

EMI shield and jack screws of rear panel connector ‘GPIB A’ are electrically shorted to

the rear panel, a GPIB cable attached to GPIB Port A has its shield and connector

housing connected to earth ground, as well, and no danger should exist associated with

GPIB Port A. There may be, however, a hazardous voltage between the cable connector

housings of the GPIB cable attached to GPIB Port A and the GPIB cable attached to

GPIB Port B.

Do not touch the GPIB-120A case, power cord, or any GPIB cable connected to the

GPIB-120A unless you are absolutely sure that there are no hazardous voltages present.

In addition, never open the GPIB-120A case unless you have removed the power cord

and all GPIB cables from the back panel.

The GPIB-120A is not recommended for use when ground potential differences in excess

of 30 V are present between the two rear panel GPIB connectors and associated cables,

unless sufficient precautions are taken to ensure human safety.

Contents

About This Manual...............................................................................................................ix

Organization of This Manual...........................................................................................ix

Conventions Used in This Manual...................................................................................ix

Related Documentation....................................................................................................x

Customer Communication ...............................................................................................x

Chapter 1

Introduction............................................................................................................................1-1

Description of the GPIB-120A ........................................................................................1-1

What You Need to Get Started ........................................................................................1-3

Optional Equipment.........................................................................................................1-3

Unpacking Your GPIB-120A...........................................................................................1-3

Chapter 2

Connection...............................................................................................................................2-1

Isolation Considerations...................................................................................................2-1

Placing Your Instruments.................................................................................................2-2

Connecting the GPIB-120A.............................................................................................2-2

Connecting to Hewlett-Packard Controllers........................................................2-2

Mounting the GPIB-120A................................................................................................2-2

Chapter 3

Theory of Operation ............................................................................................................3-1

Circuitry of the GPIB-120A.............................................................................................3-1

The GPIB-120A Front Panel............................................................................................3-2

Power On..............................................................................................................3-2

System Controller Detection................................................................................3-2

Active Controller Detection.................................................................................3-2

Source Handshake Detection...............................................................................3-2

Data Direction Control.........................................................................................3-3

Parallel Poll Detection .........................................................................................3-3

Acceptable Identification Codes......................................................................................3-4

Appendix A

Operation of the GPIB........................................................................................................A-1

History of the GPIB .........................................................................................................A-1

GPIB Operation................................................................................................................A-1

Types of Messages...............................................................................................A-1

Talkers, Listeners, and Controllers......................................................................A-2

The Controller-In-Charge and System Controller ...............................................A-2

GPIB Signals and Lines.......................................................................................A-3

Data Lines................................................................................................A-3

Handshake Lines......................................................................................A-3

NRFD (Not Ready For Data).......................................................A-3

Contents

GPIB-120A User Manual viii © National Instruments Corporation

NDAC (Not Data Accepted)........................................................A-3

DAV (Data Valid)........................................................................A-3

Interface Management Lines....................................................................A-4

ATN (Attention)...........................................................................A-4

IFC (Interface Clear)....................................................................A-4

REN (Remote Enable) .................................................................A-4

SRQ (Service Request) ................................................................A-4

EOI (End Or Identify)..................................................................A-4

Physical and Electrical Characteristics................................................................A-5

Configuration Restrictions: The Role of Expanders and Extenders...................A-8

Related Document............................................................................................................A-8

Appendix B

Specifications..........................................................................................................................B-1

Appendix C

Multiline Interface Messages............................................................................................C-1

Appendix D

Customer Communication.................................................................................................D-1

Figures

Figure 1-1. Typical GPIB-120A Extension System (Physical Configuration) .....................1-1

Figure 1-2. Typical GPIB-120A Extension System (Logical Configuration).......................1-2

Figure 3-1. GPIB-120A Block Diagram ...............................................................................3-1

Figure A-1. GPIB Connector and the Signal Assignment......................................................A-5

Figure A-2. Linear Configuration of the GPIB Devices ........................................................A-6

Figure A-3. Star Configuration of the GPIB Devices............................................................A-7

Tables

Table 3-1. IEEE 488 Capability Identification Codes .........................................................3-4

Table B-1. System Configuration.........................................................................................B-1

Table B-2. Performance Characteristics...............................................................................B-1

Table B-3. Electrical Characteristics....................................................................................B-2

Table B-4. Environmental Characteristics............................................................................B-2

Table B-5. Physical Characteristics......................................................................................B-2

About This Manual

This manual describes how to use the National Instruments GPIB-120A bus expander/isolator.

Organization of This Manual

This manual is organized as follows:

• Chapter 1, Introduction, contains a description of the GPIB-120A, lists what you need to get

started and optional equipment you can order, and explains how to unpack the GPIB-120A.

• Chapter 2, Connection, contains information for connecting your GPIB-120A.

• Chapter 3, Theory of Operation, describes the operational theory of the GPIB-120A.

• Appendix A, Operation of the GPIB, contains a brief history of the GPIB and describes the

operation of the GPIB.

• Appendix B, Specifications, lists the specifications of the GPIB-120A.

• Appendix C, Multiline Interface Messages, contains an interface message reference list,

which describes the mnemonics and messages that correspond to the interface functions.

• Appendix D, Customer Communication, contains forms you can use to request help from

National Instruments or to comment on our products or manuals.

• The Glossary contains an alphabetical list and a description of terms used in this manual,

including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.

Conventions Used in This Manual

The following conventions are used in this manual.

italic Italic text denotes emphasis, a cross reference, or an introduction to a key

concept.

bold italic Bold italic text denotes a note, caution, warning, or danger statement.

Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the

Glossary.

About This Manual

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