National Instruments GPIB-130 User Manual

National Instruments GPIB-130 Manual

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GPIB-130

User Manual

November 1993 Edition
Part Number 370897A-01

© Copyright 1991, 1994 National Instruments Corporation.

All Rights Reserved.

National Instruments Corporate Headquarters

6504 Bridge Point Parkway
Austin, TX 78730-5039
[phone]
Technical support fax: [phone]

[phone]

Branch Offices:

Australia [phone], Austria [phone], Belgium 02/757.00.20, Canada (Ontario) [phone],
Canada (Québec) [phone], Denmark 45 76 26 00, Finland (90) 527 2321, France (1) 48 14 24 24,
Germany 089/741 31 30, Italy 02/48301892, Japan [phone], Netherlands 03480-33466, Norway 32-848400,
Spain (91) 640 0085, Sweden 08-730 49 70, Switzerland 056/20 51 51, U.K. 0635 523545

Limited Warranty

The GPIB-130 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
OF

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

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.

. CUSTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART

NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER.

. This limitation of the liability of National Instruments will apply regardless of the form of action,

Copyright

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’émiet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de classe A prescrites dans le réglement sur le brouillage radioélectrique édicté par le ministére 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.

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

Description of the GPIB-130 .........................................................................................1-1

What Your Kit Should Contain......................................................................................1-3

Optional Equipment.......................................................................................................1- 4

Unpacking Your GPIB-130 ...........................................................................................1- 4

Chapter 2
Connection

Connecting the GPIB-130..............................................................................................2-1

..........................................................................................................................1-1

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

Connecting an External Power Supply ..............................................................2-2

Connecting to a Specially Configured GPIB Interface Board...........................2- 2

Connecting to Hewlett-Packard Controllers......................................................2-3

Chapter 3
Configuration and Operation

Operating Modes............................................................................................................3-1

Unbuffered Mode...............................................................................................3-1

Buffered Mode...................................................................................................3- 1

Setting the Operating Mode...............................................................................3-2

Parallel Poll Response (PPR) Modes.............................................................................3-2

Stored PPR Mode (Approach 1) ........................................................................3-3

Immediate PPR Mode (Approach 2)..................................................................3-3

Choosing the PPR Mode....................................................................................3-3

Setting the PPR Mode........................................................................................3-4

Operating the GPIB-130 System....................................................................................3-4

Power LED.........................................................................................................3-4

Link LED ...........................................................................................................3-5

Talk LED............................................................................................................3- 5

Listen LED.........................................................................................................3-5

.........................................................................................3-1

Chapter 4
Theory of Operation

Power-On (PON) State...................................................................................................4-1

System Controller Detection..........................................................................................4-2

Controller-In-Charge Detection.....................................................................................4- 2

Source Handshake Detection.........................................................................................4-2

Parallel Poll Detection ...................................................................................................4-2

FIFO Controller..............................................................................................................4-2

..........................................................................................................4-1

© National Instruments Corporation v GPIB-130 User Manual

Contents

Appendix A
Operation of the GPIB

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

Talkers, Listeners, and Controllers................................................................................A-1

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

GPIB Signals and Lines.................................................................................................A-2

Data Lines..........................................................................................................A-2

Handshake Lines................................................................................................A-2

Not Ready For Data (NRFD).................................................................A-2

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

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

Interface Management Lines..............................................................................A-3

Attention (ATN).....................................................................................A-3

Interface Clear (IFC)..............................................................................A-3

Remote Enable (REN) ...........................................................................A-3

Service Request (SRQ) ..........................................................................A-3

End Or Identify (EOI)............................................................................A-3

Physical and Electrical Characteristics..........................................................................A-4

Configuration Requirements..........................................................................................A-7

Related Document..........................................................................................................A-7

......................................................................................................A-1

Appendix B
Specifications

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

Performance Characteristics ..........................................................................................B-1

Operating Characteristics...............................................................................................B-2

Electrical Characteristics................................................................................................B-2

Environmental Characteristics.......................................................................................B-2

Physical Characteristics .................................................................................................B- 2

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

Appendix C
Cable Assembly Wire List

...............................................................................................C-1

Appendix D
Multiline Interface Messages

..........................................................................................D-1

Appendix E
Customer Communication

...............................................................................................E-1

Glossary......................................................................................................................Glossary-1

GPIB-130 User Manual vi © National Instruments Corporation

Contents

Figures

Figure 1-1. The Model GPIB-130 Bus Extender.................................................................1-1

Figure 1-2. Typical GPIB-130 Extension System (Physical Configuration)......................1-2

Figure 1-3. Typical GPIB-130 Extension System (Logical Configuration)........................1-2

Figure 2-1. GPIB-130 Side View........................................................................................2-1

Figure 3-1. Switch Setting for Operating Mode..................................................................3-2

Figure 3-2. Switch Setting for Parallel Poll Response (PPR) Mode...................................3- 4

Figure 4-1. GPIB-130 Block Diagram ................................................................................4-1

Figure A-1. GPIB Connector and the Signal Assignment....................................................A-4

Figure A-2. Linear Configuration ........................................................................................A-5

Figure A-3. Star Configuration ............................................................................................A-6

Table

Table C-1. Cable Assembly Wire List................................................................................C-1

© National Instruments Corporation vii GPIB-130 User Manual

About This Manual

This manual describes how to use the National Instruments GPIB-130 bus extender.

Organization of This Manual

This manual is organized as follows:

• Chapter 1, Introduction, contains a description of the GPIB-130, lists the contents of your
GPIB-130 kit, lists optional equipment, and explains how to unpack the GPIB-130.

• Chapter 2, Connection, contains information for connecting your GPIB-130.

• Chapter 3, Configuration and Operation, describes how to configure and operate a GPIB-130
system.

• Chapter 4, Theory of Operation, describes how the GPIB-130 circuitry operates.

• Appendix A, Operation of the GPIB, describes GPIB terminology and protocol for users
unfamiliar with the GPIB.

• Appendix B, Specifications, lists the specifications of the GPIB-130.

• Appendix C, Cable Assembly Wire List, contains the listing of wire connections for the
GPIB-130 transmission cable.

• Appendix D, Multiline Interface Messages, contains an ASCII chart with a list of the
corresponding GPIB messages and hex values.

• Appendix E, Customer Communication, contains forms for you to complete to facilitate
communication with National Instruments concerning our products.

• The Glossary contains an alphabetical list and description of terms used in this manual,
including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.

Conventions Used in This Manual

Throughout this manual, the following convention is used to distinguish elements of text:
italic Italic text denotes emphasis, a cross reference, or an introduction to a key

concept.

© National Instruments Corporation ix GPIB-130 User Manual

About This Manual

Related Documentation

The following document contains information that you may find helpful as you read this manual:

• ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable

Instrumentation

Customer Communication

National Instruments wants to receive your comments on our products and manuals. We are
interested in the applications you develop with our products and we want to help if you have
problems with them. To make it easy for you to contact us, this manual contains comment and
configuration forms for to you complete. These forms are located in Appendix E, Customer

Communication, at the end of this manual.

GPIB-130 User Manual x © National Instruments Corporation

Chapter 1
Introduction

This chapter contains a description of the GPIB-130, lists the contents of your GPIB-130 kit, lists
optional equipment, and explains how to unpack the GPIB-130.

The GPIB-130 is a high-speed bus extender with the following features:

• It extends the maximum GPIB cable length to 300 m.

• It expands the GPIB to interface up to 28 devices.

• It performs high-speed parallel transmissions, with rates up to 900 kbytes/sec.

• It has a switch to select buffered transfers for high performance or normal GPIB transfers
with interlocked handshaking.

• It has a switch to select immediate parallel poll mode, for cable lengths of 60 m or less, or
stored parallel poll mode, for longer distances.

Description of the GPIB-130

The high-speed GPIB-130 bus extender (shown in Figure 1-1) is used in pairs with a special
parallel data transmission cable to connect two separate GPIB (IEEE 488) bus systems in a
functionally transparent manner.

Figure 1-1. The Model GPIB-130 Bus Extender

© National Instruments Corporation 1-1 GPIB-130 User Manual

Introduction Chapter 1

While the two bus systems are physically separate, as shown in Figure 1-2, devices logically
appear to be located on the same bus as shown in Figure 1-3.

RS-422 Compatible

Transmission

Lines

Computer

(System Controller,

Talker, and Listener)

GPIB-130 GPIB-130

Printer

(Listener)

Multimeter

(Talker and Listener)

GPIB #2GPIB #1

Unit Under Test

Figure 1-2. Typical GPIB-130 Extension System (Physical Configuration)

GPIB

Signal Generator

(Listener)

Computer

(System Controller,

Talker, and Listener)

Figure 1-3. Typical GPIB-130 Extension System (Logical Configuration)

GPIB-130 User Manual 1-2 © National Instruments Corporation

Printer

(Listener)

Multimeter

(Talker and Listener)

Unit Under Test

Signal Generator

(Listener)

Chapter 1 Introduction

With the GPIB-130, it is possible to overcome the following two configuration restrictions
imposed by ANSI/IEEE Standard 488.1-1987:

• A cable length limit of 20 m total per contiguous bus or 2 m times the number of devices on
the bus, whichever is smaller

• An electrical loading limit of 15 devices per contiguous bus

Each GPIB-130 system extends the distance limit by 300 m and the loading limit to 30 devices
(including the extenders), without sacrificing speed or performance. These point-to-point
extender systems can be connected in series for longer distances or in star patterns for additional
loading.

The maximum data transfer rate over the extension is 900 kbytes/sec. Furthermore, there is no
speed degradation at all for transfers between devices on the same side of the extension.
Because the GPIB-130 is a functionally transparent extender, the same GPIB communications
and control programs that work with an unextended system can work unmodified with an
extended system. There is one minor exception to this transparency in conducting parallel polls,
as explained in Chapter 3 in the section Parallel Poll Response (PPR) Modes.

What Your Kit Should Contain

Your GPIB-130 kit should contain the following components:

Kit Component Part Number

GPIB-130 Bus Extender 181460-01
One of the following power supplies:

• 100-120 VAC (5V-regulated, 700mA)
or

• 220-240 VAC (5V-regulated, 1A)

GPIB-130 User Manual 320391-01

181626-01

181626-31

© National Instruments Corporation 1-3 GPIB-130 User Manual

Introduction Chapter 1

Optional Equipment

Equipment Part Number

Transmission Cables:

(xxx

= length in meters)

• Type T5 (NEC CL2 rated) – up to 50 m

• Type T2 (NEC CL2 rated) – 0 m to 300 m

• Type T6 (NEC CL2P-Plenum rated) – 0 m to 300 m
Type X1 GPIB Cable (Single-Shielded)*:

•1 m

•2 m

•4 m
Type X2 GPIB Cable (Double-Shielded)*:

•1 m

•2 m

•4 m
* To meet FCC emission limits for this Class A device, you must use a shielded (Type X1

or X2) GPIB cable. Operating this equipment with a non-shielded cable may cause
interference to radio and television reception in commercial areas.

181563-xxx
178056-xxx
181564-xxx

763001-01
763001-02
763001-03

763061-01
763061-02
763061-03

Unpacking Your GPIB-130

Follow these steps when unpacking your GPIB-130.

1. Verify that the pieces contained in the package you received match the kit parts list given
earlier in this section.

2. Inspect the shipping container and contents for damage. If the container is damaged and the
damage appears to have been caused in shipment, file a claim with the carrier. If the
equipment is damaged, do not attempt to operate it. Contact National Instruments for
instructions. Retain the shipping material for possible inspection by carrier or reshipment of
the equipment.

GPIB-130 User Manual 1-4 © National Instruments Corporation

Chapter 2
Connection

This chapter contains information for connecting your GPIB-130.

Connecting the GPIB-130

Figure 2-1 shows a side view of the GPIB-130.

The GPIB-130 may be powered on from either an external 5V regulated power supply or from a
specially configured National Instruments GPIB interface board.

© National Instruments Corporation 2-1 GPIB-130 User Manual

Figure 2-1. GPIB-130 Side View

Connection Chapter 2

Connecting an External Power Supply

Caution: Not for installation in air ducts or plenums. For installation in other environmental

air handling spaces, use only with cable classified by U.L. Inc. as to fire and smoke
characteristics in accordance with section 725.2(B) of the National Electrical Code.

To connect an external power supply to the GPIB-130, complete the following steps.
Caution: Failure to follow these steps for installation may result in damage to your GPIB-130

and your system.

1. Make sure that the power switch on the side panel is in the off position.

2. Inspect the power supply to confirm that it is compatible with the line voltage available
from the wall outlet.

3. Push the phono-jack connector of the external power supply into the 5VDC jack of the
GPIB-130.

4. Turn the phono-jack connector so that it screws into the threading on the 5VDC jack.

5. Plug the power supply into the wall outlet.

6. Connect the transmission cable to both GPIB-130s.

7. Slide the power switch of both extenders to the on position.

The GPIB-130 extension is now operational.

Connecting to a Specially Configured GPIB Interface Board

To connect the GPIB-130 to a specially equipped National Instruments GPIB interface board,
complete the following steps.

Caution: Failure to follow these steps for installation may result in damage to your GPIB-130

and your system.

1. Make sure that the power switch on the side panel is in the off position.

2. Turn off the computer containing the interface board.

3. Unplug the power cord of the computer.

4. Push either phono-jack connector of the special power cord into the 5VDC jack of the
GPIB-130.

5. Turn the phono-jack connector so that it screws into the threading on the 5VDC jack on
the GPIB-130.

GPIB-130 User Manual 2-2 © National Instruments Corporation

Chapter 2 Connection

6. Push the other phono-jack connector of the special power cord into the 5VDC jack of the
National Instruments interface board.

7. Turn the phono-jack connector so that it screws into the threading on the 5VDC jack on
the interface board.

8. Plug in the power cord of the computer and turn on the computer.

9. Connect the transmission cable to both GPIB-130s.

10. Slide the power switch of both extenders to the on position.

The GPIB-130 extension is now operational.

Connecting to Hewlett-Packard Controllers

To achieve very high data transfer rates and long cable spans between devices, many HP
Controllers and computers, such as the 64000 series, use a preload technique on the unit
designated Master Controller. When preloaded, the GPIB lines of the Master Controller are
terminated to represent six device loads. HP has two types of preloading: Class A, in which all
16 GPIB lines are loaded, and Class B, in which all lines, except NRFD and NDAC lines, are
loaded.

Preloading increases ringing on signal transitions and can cause improper operation of the
GPIB-130s. If this happens, set all signals on the Master Controller to normal (1 unit) load. This
is done using a back panel switch on your HP Controller. In addition, you must also strictly
conform to the cabling rule of no more than two meters per device.

© National Instruments Corporation 2-3 GPIB-130 User Manual

Chapter 3
Configuration and Operation

This chapter describes how to configure and operate a GPIB-130 system.

Operating Modes

The GPIB-130 has two operating modes: Unbuffered mode and Buffered mode. The operating
mode determines how data is transmitted across the extension. Both units in the extension
system must be set to the same mode.

Unbuffered Mode

In Unbuffered mode, each data byte is transmitted using the GPIB double interlocked
handshaking protocol. For long data streams, transfers using Unbuffered mode are slower than
transfers using Buffered mode. However, the GPIB extension is transparent in Unbuffered
mode.

Buffered Mode

In Buffered mode, the GPIB-130 uses FIFOs to buffer data between the remote and local units.
For long data streams, you can obtain a much higher data throughput with Buffered mode than
with Unbuffered mode.

Consider the following situation: a GPIB device on the local side of the extension is addressed to
talk; another device on the remote side is addressed to listen. When the talking device sources
data bytes, the GPIB-130s accept the data bytes and store them in a FIFO. At the same time, the
GPIB-130s read data from the FIFO and source data bytes to the Listener. Whenever the FIFO
contains data, the number of bytes sourced by the Talker differs from the number of bytes
accepted by the Listener. A few applications may not operate properly in Buffered mode.

GPIB command bytes are not stored in the FIFOs; they are transmitted using the GPIB double
interlocked handshaking protocol.

In most applications, the GPIB-130s should be configured in Buffered mode.

© National Instruments Corporation 3-1 GPIB-130 User Manual

Configuration and Operation Chapter 3

Setting the Operating Mode

Both GPIB-130s in the extension system must be set to the same operating mode. Use switch
position 1 on the side of each GPIB-130 to set the operating mode. Slide the switch to the up
position to set Buffered mode; slide the switch down to set Unbuffered mode. See Figure 3-1.

On Off

Buffered

Unbuffered

PPoll Im
PPoll St

A. Buffered Mode

. . . . . . . . . . . .

On Off

Buffered

Unbuffered

PPoll Im
PPoll St

. . . . . . . . . . . .

Key

= Buffer position
= PPoll position

B. Unbuffered Mode

Figure 3-1. Switch Setting for Operating Mode

Parallel Poll Response (PPR) Modes

According to ANSI/IEEE Standard 488.1-1987, devices must respond to a parallel poll within
200 nsec after the Identify (IDY) message (Attention (ATN) and End Or Identify (EOI)) is
asserted by the Controller-In-Charge (CIC). The Controller then waits at least 2 µsec before
reading the Parallel Poll Response (PPR). In many cases, a remote device on an extended
system cannot respond to Parallel Polls this quickly because of cable propagation delays. The
GPIB-130s can solve this problem using one of the following two approaches:

Approach 1: Respond to IDY within 200 nsec with the results of the previous poll of the

remote bus.

Approach 2: Ignore the 200 nsec rule and assume that the Controller will wait long enough to

capture the response.

GPIB-130 User Manual 3-2 © National Instruments Corporation

Chapter 3 Configuration and Operation

Stored PPR Mode (Approach 1)

In the stored PPR mode, the GPIB-130s use an internal PPR data register. When a Controller on
the local GPIB system asserts IDY, the local GPIB-130 extender responds by outputting the
contents of the PPR data register to the local GPIB data lines. At the same time, a parallel poll
message is sent to the remote bus. When the local IDY signal is unasserted, the PPR from the
remote system is loaded into the internal PPR data register. Consequently, the register always
contains the response of the previous complete poll. To obtain the response of both local and
remote GPIB systems, the control program executes two parallel polls back-to-back and uses the
second response.

The software driver library of most Controllers contains an easy-to-use parallel poll function. If,
for example, the function is called ibrpp and the control program is written in BASIC, the
sequence to conduct a poll in Stored PPR mode might be similar to the following sequence:

.
.
.
CALL ibrpp (brd0%, ppr%)
CALL ibrpp (brd0%, ppr%)
IF ppr > 0 GOTO 300
.
.
.

Immediate PPR Mode (Approach 2)

In this mode, the GPIB-130s do not use the internal PPR data register. When a Controller on the
local GPIB system asserts IDY, the local GPIB-130 extender sends the IDY message to the
remote bus and the response is returned as fast as propagation delays permit. The Controller
must allow time to receive the response.

Choosing the PPR Mode

Choosing the right PPR depends on the type of Controllers present in the GPIB system and the
length of cable between the GPIB-130s. Of course, if the control program does not use parallel
polls, the PPR mode does not matter.

Many Hewlett-Packard GPIB Controllers remain in a parallel poll state with IDY asserted
whenever they are not performing another function. A change in the response causes an interrupt
of the control program. In other Controllers, the IDY signal is toggled on and off and the
duration of the signal can be varied to accommodate delayed responses over extenders. When
used with these types of Controllers, the GPIB-130 should be set to Immediate PPR mode.

Most other Controllers pulse the IDY signal for about 2 µsec and expect a response within that
time. When used with this type of Controller, the GPIB-130 should use the Stored PPR mode if
the cable between the extenders is longer than about 60 m. For shorter cable distances, using the
Immediate PPR mode is recommended.

© National Instruments Corporation 3-3 GPIB-130 User Manual

Configuration and Operation Chapter 3

Both GPIB-130s in the extension system do not need to be set to the same PPR mode. The PPR
mode of the local GPIB-130 should be chosen to accommodate the Controllers on the local GPIB
system. Likewise, the PPR mode of the remote GPIB-130 should be chosen to accommodate the
Controllers on the remote GPIB system. If no Controllers are physically connected to one of the
GPIB-130s, the PPR mode of that GPIB-130 has no effect on the system.

Setting the PPR Mode

Use switch position 2 on the side of each GPIB-130 to set the PPR mode. Slide the switch to the
up position to set Immediate PPR mode; slide the switch down to set Stored PPR mode. See
Figure 3-2.

On Off

uffered
uffered

PPoll Imm.
PPoll Stored

A. Immediate PPR Mode

(Default)

. . . . . . . . . . . .

On Off

uffered
uffered

PPoll Imm.
PPoll Stored

. . . . . . . . . . . .

Key

= PPoll position
= Buffer position

B. Stored PPR Mode

Figure 3-2. Switch Setting for Parallel Poll Response (PPR) Mode

Operating the GPIB-130 System

The GPIB-130 extension system is fully operational when power is applied to both units. In
some systems, it is necessary to power on the System Controller device last, after the extenders
and all other devices are operating. This power-on sequence is necessary if the System
Controller executes only one IFC shortly after power-on.

The GPIB-130 has four indicator LEDs on the top of the box labeled Power, Link, Talk, and

Listen.

Power LED

The Power LED is lit whenever power is applied to the GPIB-130 and the power switch on the
side of the box is in the on position.

GPIB-130 User Manual 3-4 © National Instruments Corporation

Chapter 3 Configuration and Operation

Link LED

The Link LED is lit whenever both GPIB-130s are powered on and the transmission cable is
properly connected to both extenders. During operation, the Link LED turns off if the cable is
disconnected from either end of the extension, or if either GPIB-130 is powered off.

Talk LED

The Talk LED is lit whenever a device on the local GPIB system is identified as a Talker, or if a
Controller on the local GPIB system is actively asserting the ATN message. Whenever the Talk
LED of the local GPIB-130 is lit, the Listen LED of the remote GPIB-130 is lit.

Listen LED

The Listen LED is lit whenever a device on the remote GPIB system is identified as a Talker, or
if a Controller on the remote GPIB system is actively asserting the ATN message. Whenever the
Listen LED of the local GPIB-130 is lit, the Talk LED of the remote GPIB-130 is lit.

© National Instruments Corporation 3-5 GPIB-130 User Manual

Chapter 4
Theory of Operation

This chapter describes how the GPIB-130 circuitry operates. This chapter assumes that you have
a basic knowledge of the GPIB. If you are a first-time user or you would like to review the
basics, refer to Appendix A, Operation of the GPIB, for a history and the basic operation of the
GPIB.

Figure 4-1 shows a block diagram of the GPIB-130.

System

Controller

Detection

CIC

Detection

GPIB

GPIB

Tranceivers

Parallel

Poll

Detection

PPR

Register

Source

Handshake

Detection

RS-422 Transceivers

Power-On (PON) State

The GPIB-130s enter the Power-On (PON) state when you first turn them on. The GPIB-130s
remain in the PON state until the transmission cable is properly connected to both GPIB-130s.
In the PON state, all state machines and FIFOs are cleared. No GPIB lines are asserted by the
GPIB-130 in the PON state.

© National Instruments Corporation 4-1 GPIB-130 User Manual

FIFO

Controller

FIFO

Figure 4-1. GPIB-130 Block Diagram

Theory of Operation Chapter 4

When the GPIB-130s leave the PON state, the Link LED turns on and the extension system
becomes operational.

System Controller Detection

The System Controller Detection circuitry locates the GPIB System Controller if one is present
in the system. The System Controller may be on either the local side or the remote side of the
GPIB-130 extension.

The ANSI/IEEE Standard 488.1-1987 restricts a GPIB system to having only one System
Controller. However, the GPIB-130s work in systems that have more than one System
Controller. A GPIB device should assert the Interface Clear (IFC) message to become the
System Controller.

Controller-In-Charge Detection

The Controller-In-Charge (CIC) Detection circuitry locates the GPIB Controller-In-Charge if one
is present in the system. The GPIB Controllers may be on the local side, the remote side, or both
sides of the GPIB-130 extension. Devices on one side of the extension system may pass control
or take control from devices on the remote side of the extension.

Source Handshake Detection

The Source Handshake Detection circuitry locates the device sourcing GPIB command or data
bytes. Command bytes may be sourced by the CIC; data bytes may be sourced by the addressed
GPIB Talker.

One or more devices in the system may be addressed as GPIB Listeners. Listeners may be on
the same side, the opposite side, or both sides of the GPIB-130 extension.

Parallel Poll Detection

The Parallel Poll Detection circuitry determines when the CIC is conducting a parallel poll. The
GPIB-130 responds to parallel polls according to the Parallel Poll Response (PPR) mode chosen
by the position of switch 2 (see the Parallel Poll Response (PPR) Modes section in Chapter 3).

Devices on both sides of the extension may respond to parallel polls.

FIFO Controller

The FIFO Controller manages data flow into and out of the GPIB-130's FIFO. For long data
streams, you can obtain a much higher data throughput with Buffered mode than with
Unbuffered mode. The FIFO Controller remains inactive unless a device is sourcing data bytes
and the GPIB-130 is configured to be in Buffered mode. See the Operating Modes section in
Chapter 3.

Each GPIB-130 contains a FIFO and the FIFO Controller circuitry, so GPIB Talkers on both
sides of the extension can use Buffered mode.

GPIB-130 User Manual 4-2 © National Instruments Corporation

Appendix A
Operation of the GPIB

Communication among interconnected GPIB devices is achieved by passing messages through
the interface system.

Types of Messages

The GPIB carries device-dependent messages and interface messages.

• Device-dependent messages, often called data or data messages, contain device-specific
information such as programming instructions, measurement results, machine status, and data
files.

• Interface messages manage the bus itself. They are usually called commands or command
messages. Interface messages perform such tasks as initializing the bus, addressing and
unaddressing devices, and setting device modes for remote or local programming.

The term command as used here should not be confused with some device instructions which can
also be called commands. Such device-specific instructions are actually data messages.

Talkers, Listeners, and Controllers

A Talker sends data messages to one or more Listeners. The Controller manages the flow of
information on the GPIB by sending commands to all devices.

Devices can be Listeners, Talkers, and/or Controllers. A digital voltmeter, for example, is a
Talker and may be a Listener as well.

The GPIB is a bus like an ordinary computer bus, except that the computer has its circuit cards
interconnected via a backplane bus, whereas the GPIB has standalone devices interconnected via
a cable bus.

The role of the GPIB Controller can also be compared to the role of the CPU of a computer, but
a better analogy is to the switching center of a city telephone system. The switching center
(Controller) monitors the communications network (GPIB). When the center (Controller)
notices that a party (device) wants to make a call (send a data message), it connects the caller
(Talker) to the receiver (Listener).

The Controller addresses a Talker and a Listener before the Talker can send its message to the
Listener. After the message is transmitted, the Controller may unaddress both devices.

Some bus configurations do not require a Controller. For example, one device may always be a
Talker (called a Talk-only device) and there may be one or more Listen-only devices.

© National Instruments Corporation A-1 GPIB-130 User Manual

Operation of the GPIB Appendix A

A Controller is necessary when the active or addressed Talker or Listener must be changed. The
Controller function is usually handled by a computer.

With the GPIB interface board and its software your personal computer plays all three roles.

• Controller - to manage the GPIB

• Talker - to send data

• Listener - to receive data

The Controller-In-Charge and System Controller

Although there can be multiple Controllers on the GPIB, only one Controller at a time is active
or Controller-In-Charge (CIC). Active control can be passed from the current CIC to an idle
Controller. Only one device on the bus, the System Controller, can make itself the CIC. The
GPIB interface board is usually the System Controller.

GPIB Signals and Lines

The interface system consists of 16 signal lines and 8 ground return or shield drain lines.
The 16 signal lines are divided into the following three groups.

• Eight data lines

• Three handshake lines

• Five interface management lines

Data Lines

The eight data lines, DIO1 through DIO8, carry both data and command messages. All
commands and most data use the 7-bit ASCII or ISO code set, in which case the eighth bit,
DIO8, is unused or used for parity.

Handshake Lines

Three lines asynchronously control the transfer of message bytes among devices. The process is
called a three-wire interlocked handshake, and it guarantees that message bytes on the data lines
are sent and received without transmission error.

Not Ready For Data (NRFD)

NRFD indicates when a device is ready or not ready to receive a message byte. The line is
driven by all devices when receiving commands and by Listeners when receiving data messages.

GPIB-130 User Manual A-2 © National Instruments Corporation

Appendix A Operation of the GPIB

Not Data Accepted (NDAC)

NDAC indicates when a device has or has not accepted a message byte. The line is driven by all
devices when receiving commands and by Listeners when receiving data messages.

Data Valid (DAV)

DAV tells when the signals on the data lines are stable (valid) and can be accepted safely by
devices. The Controller drives DAV when sending commands and the Talker drives it when
sending data messages.

Interface Management Lines

Five lines are used to manage the flow of information across the interface.

Attention (ATN)

The Controller drives ATN true when it uses the data lines to send commands and false when it
allows a Talker to send data messages.

Interface Clear (IFC)

The System Controller drives the IFC line to initialize the bus and become CIC.

Remote Enable (REN)

The System Controller drives the REN line, which is used to place devices in remote or local
program mode.

Service Request (SRQ)

Any device can drive the SRQ line to asynchronously request service from the Controller with
the SRQ line.

End Or Identify (EOI)

The EOI line has two purposes. The Talker uses the EOI line to mark the end of a message
string. The Controller uses the EOI line to tell devices to identify their response in a parallel
poll.

© National Instruments Corporation A-3 GPIB-130 User Manual

Operation of the GPIB Appendix A

Physical and Electrical Characteristics

Devices are usually connected with a cable assembly consisting of a shielded 24 conductor cable
with both a plug and receptacle connector at each end. This design allows devices to be linked in
either a linear or a star configuration, or a combination of the two. See Figures A-1, A-2, and
A-3.

The standard connector is the Amphenol or Cinch Series 57 Microribbon or Amp Champ type.
An adapter cable using a non-standard cable and/or connector is used for special interconnection
applications.

The GPIB uses negative logic with standard TTL logic level. When DAV is true, for example, it
is a TTL low level ( ≤ 0.8V), and when DAV is false, it is a TTL high level ( ≥ 2.0V).

1

10
11
12

13

2

14

3

15

4

16

5

17

6

18

7

19

20

8

21

9

22
23
24

DIO5
DIO6
DIO7
DIO8
REN

GND (twisted with DAV)
GND (twisted with NRFD)

GND (twisted with NDAC)
GND (twisted with IFC)
GND (twisted with SRQ)

GND (twisted with ATN)
Signal Ground

DIO1
DIO2
DIO3
DIO4

EOI

DAV

NRFD

NDAC

IFC

SRQ

ATN

Shield

Figure A-1. GPIB Connector and the Signal Assignment

GPIB-130 User Manual A-4 © National Instruments Corporation

Appendix A Operation of the GPIB

© National Instruments Corporation A-5 GPIB-130 User Manual

Figure A-2. Linear Configuration

Operation of the GPIB Appendix A

GPIB-130 User Manual A-6 © National Instruments Corporation

Figure A-3. Star Configuration

Appendix A Operation of the GPIB

Configuration Requirements

To achieve the high data transfer rate that the GPIB was designed for, the physical distance
between devices and the number of devices on the bus are limited.

The following restrictions are typical.

• A maximum separation of four meters between any two devices and an average separation of
two meters over the entire bus.

• A maximum total cable length of 20 m.

• No more than 15 devices connected to each bus, with at least two-thirds powered on.

Bus extenders are available from National Instruments for use when these limits must be
exceeded.

Related Document

For more information on topics covered in this section, consult ANSI/IEEE Standard

488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation.

© National Instruments Corporation A-7 GPIB-130 User Manual

Appendix B
Specifications

This appendix lists the specifications of the GPIB-130.

System Configuration

Distance per extension up to 300 m
Loading per extension up to 14 additional devices
Multiple extensions permitted in any combination of star or linear pattern
GPIB driver output circuit and T1

timing of source device

Note: T1 is the settling time (DIO valid to DAV) and varies according to the type of drivers and

the system configuration used.

no restrictions

Performance Characteristics

Speed (buffered mode)* 900 kbytes/sec maximum
Speed (unbuffered mode)*

5 m
20 m
50 m
100 m
300 m

790 kbytes/sec maximum
640 kbytes/sec maximum
460 kbytes/sec maximum
315 kbytes/sec maximum
140 kbytes/sec maximum

Functionality transparent GPIB operation except for stored parallel

Interlocked IEEE 488 handshake maintained across the extension in Unbuffered mode

© National Instruments Corporation B-1 GPIB-130 User Manual

polls

Specifications Appendix B

IEEE 488 capability identification
codes

SH1 complete Source Handshake
AH1 complete Acceptor handshake
T5, TE5 complete Talker
L3, LE3 complete Listener
SR1 complete Service Request
RL1 complete Remote Local
PP1,2 complete Parallel Poll
DC1 complete Device Clear
DT1 complete Device Trigger
C1-5 complete Controller
E2 tri-state GPIB drivers

* Maximum sustained transfer rates assuming 1 Mbytes/sec transfer rate without extenders.

GPIB-130 User Manual B-2 © National Instruments Corporation

Appendix B Specifications

Operating Characteristics

Architecture point-to-point (not multi-drop) transmission
Operating modes Buffered mode or Unbuffered (interlocked) mode
Parallel Poll Response modes Immediate Parallel Poll Response mode or Stored

Parallel Poll Response mode

Electrical Characteristics

GPIB interface circuit tri-state drivers (SN75ALS160, SN75ALS162)
Transmission interface circuit RS-422 drivers and receivers connected with parallel

data transmission cable
GPIB interface load one standard load, AC and DC
Power 2.2 W typical

Environmental Characteristics

Operating temperature
Humidity 5% to 95% non-condensing conditions

FCC Class A verified

o

0

to 55o C

Physical Characteristics

Case dimensions 3.75 x 3.0 x 0.95 in. (95 x 76 x 24 mm)
Case material 0.050 in THK 5052-H32 Aluminum
Rack mounting Contact factory for information
GPIB cable IEEE 488 standard 24-pin
Transmission cables NEC CL2 and CL2P (Plenum) rated cables available

© National Instruments Corporation B-3 GPIB-130 User Manual

with AMP Amplimite connectors AMP HDP-20 50

pin connector with RFI/EMI shield

Appendix C
Cable Assembly Wire List

This appendix contains the wire list for the GPIB-130 Transmission Cable.

Table C-1. Cable Assembly Wire List

Connector P2A Cable Connector P2B

Signature Pin Number Pair Number Signature Pin Number

DIO1+
DIO1-

DIO2+
DIO2-

DIO3+
DIO3-

DIO4+
DIO4-

DIO5+
DIO5-

DIO6+
DIO6-

44
43

34
41

48
47

36
39

42
18

45
46

1 DIO1+

DIO1-

2 DIO2+

DIO2-

3 DIO3+

DIO3-

4 DIO4+

DIO4-

5 DIO5+

DIO5-

6 DIO6+

DIO6-

44
43

34
41

48
47

36
39

42
18

45
46

DIO7+
DIO7-

DIO8+
DIO8-

BUS SRQ+
BUS SRQ-

BUS REN+
BUS REN-

BUSPP+
BUSPP-

XIFC+
XIFC-

RIFC+
RIFC-

© National Instruments Corporation C-1 GPIB-130 User Manual

40
35

37
38

30
32

14
15

16
17

29
12

31
33

7 DIO7+

DIO7-

8 DIO8+

DIO8-

9 BUS SRQ+

BUS SRQ-

10 BUS REN+

BUS REN-

11 BUSPP+

BUSPP-

12 RIFC+

RIFC-

13 XIFC+

XIFC-

40
35

37
38

30
32

14
15

16
17

31
33

29
12

(continues)

Cable Assembly Wire List Appendix C

Table C-1. Cable Assembly Wire List (continued)

Connector P2A Cable Connector P2B

Signature Pin Number Pair Number Signature Pin Number

XATN+
XATN-

XRFD+
XRFD-

RRFD+
RRFD-

BUSDAC+
BUSDAC-

XEOI+
XEOI-

REOI+
REOI-

XDAV+
XDAV-

RDAV+
RDAV-

XPON+
XPON-

27
11

21
22

3
6

5

28
25

9
2

7

10
26

4

13
24

23

14 RATN+

RATN-

15 RRFD+

RRFD-

16 XRFD+

XRFD-

17 BUSDAC+

BUSDAC-

18 REOI+

REOI-

19 XEOI+

XEOI-

20 RDAV+

RDAV-

21 XDAV+

XDAV-

22 RPON+

RPON-

8
1

3
6

21
22

5

28

2
7

25

9
4

13
10

26
20

19

RATN+
RATN-

RPON+
RPON-

SHIELD 49

GPIB-130 User Manual C-2 © National Instruments Corporation

8
1

20
19

50

23 XATN+

XATN-

24 XPON+

XPON­SHIELD 49

27
11

24
23

50

Appendix D
Multiline Interface Messages

This section contains an interface message reference list, which describes the mnemonics and
messages that correspond to the interface functions. These multiline interface messages are sent
and received with ATN TRUE.

For more information on these messages, refer to the ANSI/IEEE Standard 488.1-1987,

IEEE Standard Digital Interface for Programmable Instrumentation.

© National Instruments Corporation D-1 GPIB-130 User Manual

Multiline Interface Messages Appendix D

Multiline Interface Messages

Hex Oct Dec ASCII Msg Hex Oct Dec ASCII Msg

00 000 0 NUL 20 040 32 SP MLA0
01 001 1 SOH GTL 21 041 33 ! MLA1
02 002 2 STX 22 042 34 " MLA2
03 003 3 ETX 23 043 35 # MLA3
04 004 4 EOT SDC 24 044 36 $ MLA4
05 005 5 ENQ PPC 25 045 37 % MLA5
06 006 6 ACK 26 046 38 & MLA6
07 007 7 BEL 27 047 39 ' MLA7

08 010 8 BS GET 28 050 40 ( MLA8
09 011 9 HT TCT 29 051 41 ) MLA9
0A 012 10 LF 2A 052 42 * MLA10
0B 013 11 VT 2B 053 43 + MLA11
0C 014 12 FF 2C 054 44 , MLA12
0D 015 13 CR 2D 055 45 - MLA13
0E 016 14 SO 2E 056 46 . MLA14
0F 017 15 SI 2F 057 47 / MLA15

10 020 16 DLE 30 060 48 0 MLA16
11 021 17 DC1 LLO 31 061 49 1 MLA17
12 022 18 DC2 32 062 50 2 MLA18
13 023 19 DC3 33 063 51 3 MLA19
14 024 20 DC4 DCL 34 064 52 4 MLA20
15 025 21 NAK PPU 35 065 53 5 MLA21
16 026 22 SYN 36 066 54 6 MLA22
17 027 23 ETB 37 067 55 7 MLA23

18 030 24 CAN SPE 38 070 56 8 MLA24
19 031 25 EM SPD 39 071 57 9 MLA25
1A 032 26 SUB 3A 072 58 : MLA26
1B 033 27 ESC 3B 073 59 ; MLA27
1C 034 28 FS 3C 074 60 < MLA28
1D 035 29 GS 3D 075 61 = MLA29
1E 036 30 RS 3E 076 62 > MLA30
1F 037 31 US 3F 077 63 ? UNL

Message Definitions

DCL Device Clear
GET Group Execute Trigger
GTL Go To Local
LLO Local Lockout
MLA My Listen Address

MSA My Secondary Address
MTA My Talk Address
PPC Parallel Poll Configure
PPD Parallel Poll Disable

GPIB-130 User Manual D-2 © National Instruments Corporation

Appendix D Multiline Interface Messages

Multiline Interface Messages

Hex Oct Dec ASCII Msg Hex Oct Dec ASCII Msg

40 100 64 @ MTA0 60 140 96 ` MSA0,PPE
41 101 65 A MTA1 61 141 97 a MSA1,PPE
42 102 66 B MTA2 62 142 98 b MSA2,PPE
43 103 67 C MTA3 63 143 99 c MSA3,PPE
44 104 68 D MTA4 64 144 100 d MSA4,PPE
45 105 69 E MTA5 65 145 101 e MSA5,PPE
46 106 70 F MTA6 66 146 102 f MSA6,PPE
47 107 71 G MTA7 67 147 103 g MSA7,PPE

48 110 72 H MTA8 68 150 104 h MSA8,PPE
49 111 73 I MTA9 69 151 105 i MSA9,PPE
4A 112 74 J MTA10 6A 152 106 j MSA10,PPE
4B 113 75 K MTA11 6B 153 107 k MSA11,PPE
4C 114 76 L MTA12 6C 154 108 l MSA12,PPE
4D 115 77 M MTA13 6D 155 109 m MSA13,PPE
4E 116 78 N MTA14 6E 156 110 n MSA14,PPE
4F 117 79 O MTA15 6F 157 111 o MSA15,PPE

50 120 80 P MTA16 70 160 112 p MSA16,PPD
51 121 81 Q MTA17 71 161 113 q MSA17,PPD
52 122 82 R MTA18 72 162 114 r MSA18,PPD
53 123 83 S MTA19 73 163 115 s MSA19,PPD
54 124 84 T MTA20 74 164 116 t MSA20,PPD
55 125 85 U MTA21 75 165 117 u MSA21,PPD
56 126 86 V MTA22 76 166 118 v MSA22,PPD
57 127 87 W MTA23 77 167 119 w MSA23,PPD

58 130 88 X MTA24 78 170 120 x MSA24,PPD
59 131 89 Y MTA25 79 171 121 y MSA25,PPD
5A 132 90 Z MTA26 7A 172 122 z MSA26,PPD
5B 133 91 [ MTA27 7B 173 123 { MSA27,PPD
5C 134 92 \ MTA28 7C 174 124 | MSA28,PPD
5D 135 93 ] MTA29 7D 175 125 } MSA29,PPD
5E 136 94 ^ MTA30 7E 176 126 ~ MSA30,PPD
5F 137 95 _ UNT 7F 177 127 DEL

PPE Parallel Poll Enable
PPU Parallel Poll Unconfigure
SDC Selected Device Clear
SPD Serial Poll Disable

SPE Serial Poll Enable
TCT Take Control
UNL Unlisten
UNT Untalk

© National Instruments Corporation D-3 GPIB-130 User Manual

Appendix E
Customer Communication

___________________________________________________

For your convenience, this appendix contains forms to help you gather the information necessary
to help us solve technical problems you might have as well as a form you can use to comment on
the product documentation. Filling out a copy of the Technical Support Form before contacting
National Instruments helps us help you better and faster.

National Instruments provides comprehensive technical assistance around the world. In the U.S.
and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to
6:00 p.m. (central time). In other countries, contact the nearest branch office. You may fax
questions to us at any time.

Corporate Headquarters

[phone]
Technical support fax: [phone]

[phone]

Branch Offices Phone Number Fax Number

Australia [phone] (03) 879 9179
Austria [phone] (0662) 437010-19
Belgium 02/757.00.20 02/757.03.11
Denmark 45 76 26 00 45 76 71 11
Finland (90) 527 2321 (90) 502 2930
France (1) 48 14 24 00 (1) 48 14 24 14
Germany 089/741 31 30 089/714 60 35
Italy 02/48301892 02/48301915
Japan [phone] (03) 3788-1923
Netherlands 03480-33466 03480-30673
Norway 32-848400 32-848600
Spain (91) 640 0085 (91) 640 0533
Sweden 08-730 49 70 08-730 43 70
Switzerland 056/20 51 51 056/27 00 25
U.K. 0635 523545 0635 523154

© National Instruments Corporation E-1 GPIB-130 User Manual

Technical Support Form

___________________________________________________

Photocopy this form and update it each time you make changes to your software or hardware, and use the completed
copy of this form as a reference for your current configuration. Completing this form accurately before contacting
National Instruments for technical support helps our applications engineers answer your questions more efficiently.

If you are using any National Instruments hardware or software products related to this problem, include the
configuration forms from their user manuals. Include additional pages if necessary.

Name
Company
Address

Fax ( ) Phone ( )
Computer brand Model Processor

Operating system
Speed MHz RAM
Mouse yes no Other adapters installed
Hard disk capacity M Brand
Instruments used

National Instruments hardware product model Revision

Configuration

National Instruments software product Version

Configuration

The problem is

List any error messages

M Display adapter

The following steps will reproduce the problem

GPIB-130 Hardware and Software
Configuration Form

___________________________________________________

Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a
new copy of this form each time you revise your software or hardware configuration, and use this form as a
reference for your current configuration. Completing this form accurately before contacting National Instruments
for technical support helps our applications engineers answer your questions more efficiently.

National Instruments Products

• GPIB-130 Revision _________________________________________________

• Remote GPIB-130 Revision _________________________________________________

• National Instruments GPIB Interface ________________________________________________

• National Instruments Software _________________________________________________

Other Products

• Computer Make and Model _________________________________________________

• Operating System Version _________________________________________________

• Number of GPIB Devices on Bus _________________________________________________

• Other Boards in System _________________________________________________

• GPIB Devices in System _________________________________________________

Documentation Comment Form

___________________________________________________

National Instruments encourages you to comment on the documentation supplied with our products. This
information helps us provide quality products to meet your needs.

Title: GPIB-130 User Manual
Edition Date: November 1993
Part Number: 370897A-01
Please comment on the completeness, clarity, and organization of the manual.

If you find errors in the manual, please record the page numbers and describe the errors.

Thank you for your help.
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Title
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Address

Phone ( )
Mail to: Technical Publications Fax to: Technical Publications

National Instruments Corporation National Instruments Corp.
6504 Bridge Point Parkway, MS 53-02 MS 53-02
Austin, TX 78730-5039 [phone]

Glossary

Prefix Meaning Value

m-

µ ­n-

% percent
° degrees
> greater than
≥ greater than or equal to
< less than
≤ less than or equal to
A amperes
AC alternating current
ANSI American National Standards Institute
ASCII American Standard Code for Information Interchange
ATN Attention
C Celsius
CIC Controller-In-Charge
CPU central processing unit
DAV Data Valid
DC direct current
DIO Data Input/Output
EOI End Or Identify
FCC Federal Communications Commission
FIFO first-in-first-out
GN D Ground
GPIB General Purpose Interface Bus
IDY Identify
IEEE Institute of Electrical and Electronic Engineers
IFC Interface Clear
ISO International Standards Organization
kbytes 1,000 bytes
LED light-emitting diode
m meters
M megabytes of memory
NDAC Not Data Accepted
NEC National Electrical Code
NRFD Not Ready For Data
oz. ounces
PON Power On

milli­micro­nano-

10
10
10

-3

-6

-9

© National Instruments Corporation Glossary-1 GPIB-130 User Manual

Glossary

PP Parallel Poll
PPR Parallel Poll Response
REN Remote Enable
sec seconds
SRQ Service Request
TTL transistor-transistor logic
V volts
VAC volts alternating current
VDC volts direct currect
W watts

GPIB-130 User Manual Glossary-2 © National Instruments Corporation