National Instruments GPIB-LPT Bedienungsanleitung

GPIB-LPT

User Manual

October 1989 Edition

Part Number 320161-01

National Instruments Corporation

6504 Bridge Point Parkway

Austin, TX 78730-5039

(512) 794-0100

(800) IEEE-488

Fax: (512) 794-8411

Limited Warranty

The GPIB-LPT hardware is warranted against defects in materials and workmanship for a period

of two years from date of shipment from National Instruments or its authorized dealer. The

GPIB-LPT Diagnostic Package software media is furnished warranted to be free from defects in

materials and workmanship under normal use for a period of 90 days from date of shipment from

NI or its authorized dealer. 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. Defects caused by misuse, abuse, or shipment are not covered.

The GPIB-LPT Diagnostic Package software program is provided "as is" without warranty of any

kind, either expressed or implied. No other warranty is expressed or implied. NI shall not be

liable or responsible for any kind of damages, including special, indirect, or consequential

damages, arising or resulting from its products, the use of its products, or the modification to its

products.

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.

Trademarks

IBM PC and AT are registered trademarks and PC XT is a trademark of International Business

Machines Corporation.

TI Professional Computer is a trademark of Texas Instruments.

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 Subpart J of Part 15 of U.S. Federal

Communications Commission (FCC) Rules, and (2) the limits for radio noise emissions from

digital apparatus set out in the Radio Interference Regulations of the Canadian Department of

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

interference from the equipment to radio and television reception in commercial areas.

There is no guarantee that interference will not occur in a particular installation. However, the

chances of interference are much less if the equipment is used according to this instruction manual.

If the equipment does cause interference to radio or television reception, which can be determined

by turning the equipment on and off, one or more of the following suggestions may reduce or

eliminate the problem.

• Operate the equipment and the receiver on different branches of your AC electrical system.

• Move the equipment away from the receiver with which it is interfering.

• Relocate the equipment with respect to the receiver.

• Reorient the receiver's antenna.

• Be sure that the equipment is plugged into a grounded outlet and that the grounding has not

been defeated with a cheater plug.

If necessary, consult National Instruments or an experienced radio/television technician for

additional suggestions. The following booklet prepared by the FCC may also be helpful: How to

Identify and Resolve Radio-TV Interference Problems. This booklet is available from the U.S.

Government Printing Office, Washington, DC 20402, Stock Number 004-000-00345-4.

Preface

This manual is divided into the following sections.

Section One, Introduction, contains a brief description of the GPIB-LPT including its features,

components, and accessories.

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

LPT into your system.

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

functional components of the GPIB-LPT.

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

with the GPIB-LPT.

Section Five, Programming the GPIB-LPT, contains specific information about the GPIB-LPT

registers along with software examples.

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

unfamiliar with the GPIB.

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

GPIB messages.

Abbreviations Used in This Manual

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

A ampere

hex hexadecimal

kbytes 1,000 bytes

m meter

Mbytes 1,000,000 bytes

µsec microsecond

sec second

V volt

VDC Volts direct current

Preface

GPIB-LPT User Manual vi © National Instruments Corporation

Related Documents

The following documents are references that cover in greater detail specific topics introduced in

this manual:

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

Instrumentation

•IBM Options Adapters Manual

Contents

Section One

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

Features............................................................................................................................1-1

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

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

Section Two

Configuration and Installation

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

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

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

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

Listen Address and Control Function Selection ..................................................2-5

Installation........................................................................................................................2-8

Section Three

Function Description

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

Address Decoding ..........................................................................................................3-2

Configuration Jumpers ...................................................................................................3-2

Data and Control Latches ................................................................................................ 3-2

Data Transceivers ............................................................................................................3-2

Data Wrap, Control Wrap and Status Buffers ................................................................3-2

External Device Listen Address Switch .......................................................................... 3-2

GPIB Handshaking ......................................................................................................... 3-3

GPIB Addressing ........................................................................................................... 3-3

Section Four

Running Diagnostic Tests

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

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

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

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

-c change LPT configuration ............................................................................... 4-3

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

Section Five

Programming the GPIB-LPT

.......................................................................5-1

The GPIB-LPT Registers ................................................................................................ 5-1

Data Register (DATA) ........................................................................................ 5-2

Status Register (STAT) .......................................................................................5-3

Control Register (CTRL) .................................................................................... 5-5

Programming Considerations .........................................................................................5-6

Using the GPIB-LPT with the DOS Operating System .....................................5-6

Using the GPIB-LPT with C and BASIC ...........................................................5-6

Acessing the Parallel Port in C ................................................................5-7

Acessing the Parallel Port in BASIC ...................................................... 5-7

Contents

GPIB-LPT User Manual viii © National Instruments Corporation

Writing a GPIB-LPT Driver ...............................................................................5-7

Setup and Initialization ............................................................................5-8

Interrupt Handler Routine .......................................................................5-8

PRINT Routine ........................................................................... 5-8

Timing Constraints.................................................................................. 5-9

Appendix A

Operation of the GPIB

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

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

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

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

System Controller and Active Controller .......................................................................A-2

GPIB Signals .................................................................................................................A-2

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

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

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

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 .............................................................................................A-7

Appendix B

Multiline Interface Messages

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

Appendix C

Specifications

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

Contents

Figures

Figure 1-1. GPIB-LPT Board ..................................................................................................1-2

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

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

Figure 2-3. Switch Setting for REN OFF, IFC ON, SRQ ON , and Address 5 .....................2-5

Figure 2-4. Setting for Address 6 hex .....................................................................................2-6

Figure 2-5. Switch Setting for REN ON, IFC ON, and SRQ OFF ........................................2-7

Figure 3-1. GPIB-LPT Block Diagram ...................................................................................3-1

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

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

Figure A-2. Linear Configuration of GPIB Devices .................................................................A-5

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

Tables

Table 2-1. IBM PC Parallel Port Adapters ..............................................................................2-2

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

Section One

Introduction

The National Instruments GPIB-LPT is a high-performance talk-only interface that converts data

sent to a standard parallel port into an IEEE-488 General Purpose Interface Bus (GPIB) format for

use with IEEE-488 printers and plotters. The GPIB-LPT looks like a standard parallel port for the

IBM PC operating system and software. It can be used to communicate with GPIB printers and

plotters with PC application programs, such as AutoCAD, that use parallel ports for printer and

plotter output.

Features

The GPIB-LPT has the following hardware features:

• emulates the standard PC parallel printer interface so that no additional software is needed

• can be configured as either LPT1 (PRN), LPT2, or LPT3

• compatible with any software using the parallel ports on the IBM PC compatibles

• small dimensions so that it fits into any slot of a personal computer

• transparent addressing of unaddressed listeners

• interrupt synchronization circuitry which holds off interrupts until the GPIB handshake is

complete

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

• choice of SRQ enable which monitors of asynchronous service requests

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

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