National Instruments GPIB-MAC Manual de usuario

National

Instruments

Model GPIB-MAC User Manual

Part Number 320064-01

November 1985 Edition

National Instruments

12109 Technology Boulevard

Austin, Texas 78727

(512) 250-9119

LIMITED WARRANTY

The GPIB-MAC is warranted against defects in materials and work-

manship for a period of one year 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 Returned Material Authorization (RMA) number must

be obtained from the factory before any equipment is returned for

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 a RMA.No other warranty is

expressed or implied National Instruments shall not be liable for

consequential damages. Contact National Instruments for more

information.

IMPORTANT NOTE

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 commit-

ment to update, nor to keep current, the information contained in this

document.

Trademarks

GPIB-MAC is a trademark of National Instruments.

Apple and Macintosh are trademarks of Apple Computer, Inc.

Microsoft is a registered trademark of Microsoft Corporation.

FCC RADIO FREQUENCY INTERFERENCE

COMPLIANCE

This equipment generates, uses, and can radiate radio frequency

energy and if not installed and used in accordance with the

instruction manual, may cause interference to radio communica-

tions. It has been tested using a shielded serial I/O cable and

standard GPIB cable and found to comply within the limits for a

Class A computing device pursuant to Subpart J of Part 15 of FCC

Rules, which are designed to provide reasonable protection against

such interference when operated in a commercial environment

Operation of this equipment in a residential area is likely to cause

interference, in which case the user at his own expense will be

required to take whatever measures may be necessary will be

required to take whatever measures may be necessary to correct the

interference.

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.

Reposition the equipment or receiver.

Reposition the receiver’s antenna.

Unplug any unused I/O cables. Unterminated I/O cables are a

potential source of interference.

Remove any unused circuit boards. Unterminated circuit boards

are also a potential source of interference.

Be sure the computing device is plugged into a grounded outlet

and that the grounding has not been defeated with a cheater plug.

Replace the GPIB cable with Hewlett-Packard Model 10833

cable.

If none of these measures resolves your interference problems,

contact the manufacturer or write to the U.S. Government Printing

Office, Washington, D.C. 20402, for the booklet, “How to Identify

and Resolve Radio-TV Interference Problems, “Stock Number 004-

000-000345-4.

November 1985

National Instruments

Preface

Welcome to the family of National Instruments GPIB products and

to the Model GPIB-MAC.

The Model GPIB-MAC allows the GPIB to be controlled from a

Macintosh personal computer.

About the Manual

The manual is designed for users who have some familiarity with

the Macintosh personal computer, the GPIB, and test and meas-

urement equipment.

For users with less experience, we have included appendixes that

describe the operation of the GPIB.

For more specific details on the operation of the GPIB, refer to the

IEEE Std. 488-1978, “IEEE Standard Digital Interface for Program-

mable Instrumentation.”

Whatever your level of experience, if you encounter problems,

National Instruments has a staff of applications engineers ready to

help you with your particular problem. Just call

800/53

l-GPIB

800/531-5066 (outside Texas)

800/IEEE-488

(inside Texas)

between the hours of 8:00 a.m and 5:00 p.m, Central Time.

Now, look over the next few pages at how the manual is organized

and then at the Table of Contents so that you will be familiar with

the complete contents for future reference.

vii

PREFACE

November 1985

Organization of the Manual

Section

One

Section Two

Section Three

Section Four

Appendix A

Appendix B

Appendix C

Appendix D

Appendix F

Appendix G

Appendix H

Appendix1

National Instruments

gives brief introductions to the GPIB-MAC and the

IEEE-488.

contains the installation and configuration steps.

explains how to program the GPIB-MAC.

gives a detailed description of each function. The

function descriptions are arranged in alphabetical

order and each contains the syntax and purpose of

the functions, and examples.

contains a table of multiline interface messages.

lists status information.

shows how to change the operating voltage from

115 to 230.

describes the operation of the GPIB.

gives answers to common questions.

explains the use and operation of Parallel Polls.

gives additional detail on setting switches on the

GPIB-MAC.

contains a sample program of general programming

steps.

contains a sample program to control the serial port

of the Macintosh from a C program.

Vlll

PREFACE

November 1985

National Instruments

TABLE OF

CONTENTS

1 SECTION ONE

Introduction

Introduction to the GPIB-MAC

Introduction to the IEEE-488 (GPIB)

1 Description of the Model GPIB-MAC

Environmental Specifications

2 Physical Specifications

Quick Reference Chart

The Model GPIB-MAC Front Panel

The Model GPIB-MAC Back Panel

Mechanical Specifications

Electrical Specifications

SECTION TWO

Installation and Configuration

Inspection

Installation

Voltage Requirements

Configure the GPIB-MAC Rear Panel Switches

Switches 1 and 2

Factory Use Only

Switch 3

Word Length

Switch 4

Stop Bits

Switches 5 and 6

Parity Type

Switches

7,8,

and 9

Baud Rate

Connect Cables

Turn Power Switch to On

17 SECTION THREE

Programming the GPIB-MAC

Programming Messages

Programmin

Message Format

How Messages are Processed

Function Names

Function Argument Delimiters

Abbreviations for Arguments

GPIB Address

Numeric String Argument

Status Information

Serial Port Error Handling

GPIB Read and Write Termination Method

Default Settings

TABLE OF

CONTENTS

November 1985

National Instruments

List of Functions by Group

GPIB Functions

Serial Port Functions

General Use Functions

List of Functions in Alphabetical Order

27 SECTION FOUR- Functions

Points to Remember

cat

Become Active Controller

caddr

Change the

GPIB

Address of the GPIB-MAC

clr

Clear Specified Device *

cmd

Send GPIB Commands

echo

Echo Characters Received from Serial Port

eos

Change/Disable GPIB EOS Termination Mode

eot

Enable/Disable END Message on GPIB Writes

gts

Go from Active Controller to Standby

id.MAC

Identify System

ist

Set or Clear Individual Status Bit

lot-GotoLocal*

on1

Place the GPlB-MAC Online/Offline

pet

Pass Control

ppc

Parallel Poll Configure

ppu

Parallel Poll Unconfigure

Read Data *

rpp

Request (Conduct) a Parallel Poll

rsc

Request or Release System Control

rsp

Request (Conduct) a Serial Poll

rsv

Request Service/Set or Change Serial Poll Status Byte

sic

Send Interface Clear

spign

Ignore Serial Port Errors

sre

Set or Clear Remote Enable

stat

Return GPIB-MAC Status

tmo

Change or Disable Time Limit

trg

Trigger Selected Device(s) *

wait

Wait for Selected Event

wrt-WriteData*

xon

Change Serial Port XON/XOFF Protocol

* frequently used function

TABLE OF CONTENTS

November 1985

National Instruments

93 APPENDIX A

Multiline Interface Messages

97 APPENDIX B

Status Information

Status Bits

100

GPIB Error Codes

103

Serial Port Error Codes

105 APPENDIX C

Changing from 115 VAC to 230 VAC

107 APPENDIX D

Operation of the GPIB

107

Types of Messages

107

Talkers, Listeners, and Controllers

108

System Controller and Active Controller

109

GPIB Signals

110

Data Lines

110

Handshake Lines

111

Interface Management Lines

111

Physical and Electrical Characteristics

114

Configuration Restrictions

115 APPENDIX E

Common Questions

117 APPENDIX F

Parallel Polling

:::

Operation

Configuration

119

The

Parallel Poll

119

Disabling Parallel Poll Response

119

Example

121 APPENDIX G

Setting Switches

123 APPENDIX H

Sample Program

123

General Steps

123

Using an HP 7475A Plotter with a Macintosh

123

Getting Ready to Program

TABLE

CONTENTS

November 1985

National Instruments

124

Programming Steps

124

Step

stat Function

125

Step 2

Serial Port Functions

125

Step

GPIB Initialization Functions

125

Step 4

Communicate with rd and wrt Functions

127

APPENDIX I

Serial Port Sample Program

xii

TABLE

OF CONTENTS

Tabla de contenidos

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