National Instruments GPIB-COM Bedienungsanleitung

GPIB-COM

User Manual

June 1990 Edition

Part Number 320197-01

National Instruments Corporation

6504 Bridge Point Parkway

Austin, TX 78730-5039

(512) 794-0100

(800) IEEE-488 (toll-free U.S. and Canada)

Technical support fax: (512) 794-5678

Limited Warranty

The GPIB-COM is warranted against defects in materials and workmanship for a period of two

years from date of shipment. National Instruments will repair or replace equipment which proves

to be defective during the warranty period. This warranty includes parts and labor. A Return

Material Authorization (RMA) number must be obtained from National Instruments before any

equipment is returned for repair. Faults caused by misuse are not covered under the warranty.

During the warranty period, the owner may return failed parts to National Instruments for repair.

National Instruments will pay the shipping costs of returning the part to the owner. All items

returned to National Instruments for repair must be clearly marked on the outside of the package

with an RMA number.

No other warranty is expressed or implied. National Instruments shall not be liable for

consequential damages. Contact National Instruments for more information.

Important Notice

The material in this manual is subject to change without notice. National Instruments assumes no

responsibility for errors which may appear in this manual. National Instruments makes no

commitment to update, nor to keep current, the information contained in this document.

Under the copyright laws, this manual may not be copied, photocopied, reproduced, translated, in

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

Trademark

IBM is a registered trademark of International Business Machines Corporation.

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 B

computing device, in accordance with the specifications in 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

Communications (DOC). These regulations are designed to provide reasonable protection

against interference from the equipment to radio and television reception in residential 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.

Preface

Introduction to the GPIB-COM

The GPIB-COM is a high-performance talk/listen interface board that makes communication

possible between IEEE-488 devices and IBM personal computers and compatibles (hereafter

referred to as PCs) equipped with software that uses the serial ports.

Organization of This Manual

This manual is divided into the following sections:

Section One, Introduction, contains a brief description of the GPIB-COM including a listing of its

features, accessories, and components.

Section Two, Configuration and Installation, describes how to configure and install the GPIB-

COM into your system.

Section Three, Function Description, shows a block diagram of the GPIB-COM and describes the

functional components of the GPIB-COM.

Section Four, Running Diagnostic Tests, describes how to run the diagnostic tests that are shipped

with the GPIB-COM.

Section Five, Programming the GPIB-COM, presents a description of the GPIB-COM Serial Port

Emulator registers and information on programming the IBM serial adapter.

Appendix A, Specifications, lists the specifications of the GPIB-COM board.

Appendix B, Multiline Interface Command Messages, contains an ASCII chart and a list of the

corresponding GPIB messages.

Appendix C, Operation of the GPIB, describes GPIB terminology and protocol for users

unfamiliar with the GPIB.

Related Documents

The following documents contain information that may be helpful as you read this manual:

•ANSI/IEEE Std 488-1978, IEEE Standard Digital Interface for Programmable

Instrumentation

•IBM Options and Adapters Manual

•IBM PC Technical Reference Manual

•IBM Disk Operating System Manual

•INS8250A Data Sheet, National Semiconductor

Preface

GPIB-COM User Manual vi © National Instruments Corporation

Abbreviations Used in This Manual

The following abbreviations are used in the text of this manual.

≤is less than or equal to

≥is greater than or equal to

±plus or minus

A ampere

C Celsius

hex hexadecimal

in. inch

I/O input/output

kbyte 1000 bytes

m meter

Mbyte megabyte

MHz megahertz

msec millisecond

r read

r/w read/write

sec second

V volt

VDC volts direct current

w write

Contents

Section One

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

GPIB-COM Characteristics............................................................................................1-1

What Your Kit Should Contain......................................................................................1-2

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

Section Two

Configuration and Installation......................................................................................2-1

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

Switch and Jumper Settings................................................................................2-3

Base I/O Address and Interrupt Selection...........................................................2-3

Talk/Listen Modes..............................................................................................2-4

Talk/Listen Address and Special Function Selection...........................................2-5

Installation.......................................................................................................................2-7

Special Considerations When Using the GPIB-COM....................................................2-8

Section Three

Function Description........................................................................................................3-1

The GPIB-COM Interface..............................................................................................3-1

GPIB-COM Components...............................................................................................3-3

Address Decoding..............................................................................................3-3

Configuration Jumpers.......................................................................................3-3

INS8250A Compatible Registers.......................................................................3-3

GPIB Acceptor and Source Handshaking...........................................................3-3

Mode Control Logic............................................................................................3-3

Interrupt Control Logic.......................................................................................3-3

Direction Buffers................................................................................................3-4

GPIB Transceivers..............................................................................................3-4

Section Four

Running Diagnostic Tests...............................................................................................4-1

The GPIB-COM Test Commands..................................................................................4-1

-1 printer test.......................................................................................................4-1

-2 plotter test.......................................................................................................4-2

-c change COM configuration.............................................................................4-3

-q quit..................................................................................................................4-3

Section Five

Programming the GPIB-COM......................................................................................5-1

The GPIB-COM Registers.............................................................................................5-1

Transmitter Holding Register..............................................................................5-2

Receive Buffer Register......................................................................................5-3

Divisor Latch Least Significant Byte (LSB) Register..........................................5-4

Divisor Latch Most Significant Byte (MSB) Register........................................5-4

Interrupt Enable Register....................................................................................5-5

Interrupt Identification Register...........................................................................5-7

Contents

GPIB-COM User Manual viii © National Instruments Corporation

Line Control Register..........................................................................................5-8

Modem Control Register....................................................................................5-10

Line Status Register............................................................................................5-12

Modem Status Register.......................................................................................5-14

Programming the Serial Adapter....................................................................................5-16

Polling Method...................................................................................................5-16

Interrupt-Driven Method.....................................................................................5-16

The GPIB-COM Controller Function.............................................................................5-17

Appendix A

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

Appendix B

Multiline Interface Command Messages..................................................................B-1

Appendix C

Operation of the GPIB......................................................................................................C-1

History of the GPIB........................................................................................................C-1

Types of Messages.........................................................................................................C-1

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

System Controller and Active Controller........................................................................C-2

GPIB Signals..................................................................................................................C-2

Data Lines.......................................................................................................................C-3

Handshake Lines.............................................................................................................C-3

NRFD (not ready for data)..................................................................................C-3

NDAC (not data accepted)..................................................................................C-3

DAV (data valid)................................................................................................C-4

Interface Management Lines...........................................................................................C-4

ATN (attention)...................................................................................................C-4

IFC (interface clear)............................................................................................C-4

REN (remote enable)..........................................................................................C-4

SRQ (service request).........................................................................................C-4

EOI (end or identify)..........................................................................................C-4

Physical and Electrical Characteristics............................................................................C-5

Configuration Restrictions..............................................................................................C-7

Contents

Figures

Figure 1-1. GPIB-COM Board................................................................................................1-2

Figure 2-1. GPIB-COM Parts Locator Diagram......................................................................2-1

Figure 2-2. Possible Settings for GPIB-COM Jumpers...........................................................2-4

Figure 2-3. Jumper W1 Settings..............................................................................................2-4

Figure 2-4. Switch Setting for REN* OFF, IFC* ON, SRQ* ON, and Listen Address 5......2-5

Figure 2-5. Listen Address Setting for Listen Address 10 Hex................................................2-6

Figure 2-6. Switch Setting for REN* ON, IFC* OFF, and SRQ* OFF..................................2-7

Figure 3-1. Block Diagram of GPIB-COM.............................................................................3-2

Figure 4-1. Plotter Output.........................................................................................................4-2

Figure C-1. GPIB Cable Connector..........................................................................................C-3

Figure C-2. Linear Configuration of the GPIB Devices............................................................C-5

Figure C-3. Star Configuration of GPIB Devices.....................................................................C-6

Tables

Table 2-1. IBM PC Serial Port Adapters................................................................................2-3

Table 2-2. Factory Default Settings and Optional Configurations...........................................2-3

Table 5-1. GPIB-COM Registers...........................................................................................5-1

Table 5-2. Interrupt Types and Priorities.................................................................................5-7

Table 5-3. Word Length Select Bits........................................................................................5-9

Section One

Introduction

This section contains a brief description of the GPIB-COM interface and a list of its characteristics

and components.

GPIB-COM Characteristics

The National Instruments GPIB-COM is a high-performance talk/listen interface that converts data

between a standard serial port format and IEEE-488 General Purpose Interface Bus (GPIB)

format for use with IEEE-488 printers and plotters. It can be used with any serial port software

on the PC. The GPIB-COM looks like a standard serial port to the IBM PC operating system and

software. It can be used to interface IEEE-488 devices to any PC software that uses the serial

ports.

The GPIB-COM has the following hardware features:

• emulates the standard PC serial adapter interface so that no additional software is needed

• can be configured as either COM1, COM2, COM3, or COM4

• compatible with any software using the serial ports on the IBM PC and its compatibles

• transparent addressing of unaddressed Talkers and Listeners

• choice of talk-only mode for use with listen-only printers and plotters

• choice of REN mode, which operates an instrument in the remote mode

• choice of SRQ enable, which allows monitoring of asynchronous service requests

• choice of IFC mode, which sends an interface clear when the computer is powered on

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