National Instruments GPIB-SBX User manual

© Copyright 1983, 1996 National Instruments Corporation.
All Rights Reserved.
GPIB-SBX
User Manual
January 1996 Edition
Part Number 320015-01

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Limited Warranty
The GPIB-SBX 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.
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© National Instruments Corporation v GPIB-SBX User Manual
Preface
This manual contains information you need to install, configure, and use the GPIB-SBX
interface board. Included in this manual are descriptions of the interface registers, programming
considerations, diagnostic tests, and sample programs.
Organization of the GPIB-SBX User Manual
The GPIB-SBX User Manual is organized as follows:
• Chapter 1, Introduction, contains a brief description of the GPIB-SBX kit, a list of equipment
supplied, and a list of optional equipment.
• Chapter 2, General Description, contains the physical and electrical specifications for the
GPIB-SBX and describes the characteristics of key interface board components.
• Chapter 3, Configuration and Installation, describes the steps needed to configure and install
the GPIB-SBX hardware.
• Chapter 4, Register Descriptions, contains detailed descriptions of the interface registers as
well as summary tables for easy reference.
• Chapter 5, Programming Considerations, explains important considerations for persons
programming the GPIB-SBX.
• Chapter 6, Theory of Operation, contains a detailed technical discussion of the major
elements of the GPIB-SBX.
• Chapter 7, Diagnostic and Troubleshooting Test Procedures, contains test procedures for
determining if the GPIB-SBX is installed properly and operating correctly.
• Appendix A, Parts List and Schematic Diagram, includes a parts list and detailed schematic
diagram.
• Appendix B, Sample Programs, provides sample programs in 8080 and 8088 Assembly
language code for implementing the most commonly used GPIB functions. Line-by-line
comments provide an explanation of each function.
• Appendix C, Multiline Interface Messages, contains a listing of the multiline GPIB interface
messages.
• Appendix D, Mnemonics Key, contains an alphabetical listing of all mnemonics used in this
manual and indicates whether the mnemonic represents a bit, register, function, remote
message, local message, or a state.
• The Index contains an alphabetical list of key terms and topics used in this manual, including
the page where each one can be found.

Preface
GPIB-SBX User Manual vi © National Instruments Corporation
Terminology
The term set is used throughout this manual to mean writing a value of 1 to a memory element.
The term clear is used to mean writing a value of 0 to a memory element. The terms set to zero,
set false, preset, and reset are avoided in preference to the use of set and clear. Bit signatures are
written in upper case letters. An asterisk (*) after a bit signature indicates the signal is active
low. An asterisk is equivalent to an overbar. For example, if bit ATN*=0, the GPIB ATN signal
line is asserted. After the mnemonic of a register name is introduced and the name written out,
the mnemonic is used thereafter.
Where it is necessary to specify a particular bit of a register the bit position appears as a decimal
number in square brackets after the mnemonic (for example, ISR1[2] indicates the ERR bit of
Interrupt Status Register 1).
Uppercase mnemonics are used for control, status, data registers, register contents, and interface
functions, as well as GPIB remote messages, commands, and logic states as defined in the IEEE-
488 standard.
The term addressed means the interface has been configured to perform a function from the
GPIB side, while the term programmed means that it has been configured from the SBX bus
side. This distinction is important to make because many functions, such as making the interface
a Talker or Listener, can be activated from either side.
In logical expressions a minus sign (-) is used to indicate logical negation, an ampersand (&)
represents AND, and a plus sign (+) represents OR. In some cases, a plus sign is used to indicate
addition, such as I/O addresses for interface registers in Chapter 4.
All numbers are decimal unless specified otherwise. Register offsets are given in hexadecimal.
Abbreviations
The following abbreviations are used in the text of this manual.
≥greater than or equal to
< less than
A ampere
hex hexadecimal
in. inch
kbytes/sec 1,000 bytes per second
K 1,024 bytes of memory
m meter
µA microampere
µsec microsecond
mA milliampere
MHz megahertz
nsec nanosecond
V volt
VDC volts direct current

Preface
© National Instruments Corporation vii GPIB-SBX User Manual
Related Documents
The following documents contains information that you may find helpful as you read this
manual:
•IEEE Standard Digital Interface for Programmable Instrumentation, ANSI/IEEE Standard
488.1-1987
• µ PD7210 GPIB-IFC User's Manual, NEC Electronics USA, Inc., One Natick Executive
Park, Natick, MA 01760
• µ PD7210 Intelligent GPIB Interface Controller, Engineering Data Sheet, NEC Electronics
USA, Inc., Microcomputer Division
•How to Interface a Microcomputer System to a GPIB, (& The NEC µPD7210 TLC), NEC
Electronics USA, Inc.
•Intel iSBX Bus Specification, (manual order number 142686-002) Intel Corporation, 3065
Bowers Ave., Santa Clara, CA 95051
•Designing iSBX Multimodule Boards, Stephen Grubb, OEM Microcomputer Systems
Applications, Intel Corporation
Customer Communication
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communicate with us, we provide a User Comment Form for documentation comments. Please
mail it to the address printed at the bottom of the form.
If you encounter any technical problems, you can use the following toll-free number between the
hours of 8:00 a.m. and 5:30 p.m. (central time) to reach the National Instruments applications
engineering department:
[phone]
(800) IEEE-488 (toll-free U.S. and Canada)

© National Instruments Corporation viii GPIB-SBX User Manual
Contents
Chapter 1
Introduction .........................................................................................................................1-1
GPIB-SBX Interface Kit Description ...........................................................................1-1
What Your Kit Should Contain .....................................................................................1-2
Optional Equipment ......................................................................................................1-2
Chapter 2
General Description...........................................................................................................2-1
GPIB-SBX Specifications..............................................................................................2-1
Physical Specifications......................................................................................2-1
Electrical Specifications.....................................................................................2-1
SBX Interface Bus Signals.............................................................................................2-3
Control Lines......................................................................................................2-5
Command Lines (IORD*, IOWRT*).....................................................2-5
DMA Lines (MDRQT, MDACK*, TDMA)..........................................2-5
Initialize Line (MRESET)......................................................................2-5
Clock Line (MCLK)...............................................................................2-5
System Control Lines (MWAIT*, MPST*)...........................................2-5
Address and Chip Select Lines (MA2-MA0, MCS1*-MCS0*)........................2-5
Data Lines (MD7-MD0)....................................................................................2-6
Interrupt Line (MINTR1-MINTR0)...................................................................2-6
Power and Ground Lines (+5 V, +-12 V, GND)................................................2-6
Data Transfer Modes and Performance.........................................................................2-6
Description of the General Purpose Interface Bus (GPIB)............................................2-7
GPIB Operation..................................................................................................2-7
GPIB Signal Lines.............................................................................................2-8
GPIB Physical Characteristics...........................................................................2-9
GPIB-SBX Functional Description................................................................................2-10
Chapter 3
Configuration and Installation.......................................................................................3-1
Configuration.................................................................................................................3-1
Installation......................................................................................................................3-1
Cabling...........................................................................................................................3-3
Verification Testing.......................................................................................................3-4
Chapter 4
Register Descriptions.........................................................................................................4-1
Introduction....................................................................................................................4-1
Terminology...................................................................................................................4-1
Interface Registers..........................................................................................................4-2
Data In Register (DIR).......................................................................................4-5
Command/Data Out Register (CDOR)..............................................................4-6
Interrupt Status Register 1 (ISR1)......................................................................4-7
Interrupt Mask Register 1 (IMR1).....................................................................4-7

Contents
GPIB-SBX User Manual ix© National Instruments Corporation
Interrupt Status Register 2 (ISR2)......................................................................4-13
Interrupt Mask Register 2 (IMR2).....................................................................4-13
Serial Poll Status Register (SPSR).....................................................................4-17
Serial Poll Mode Register (SPMR)....................................................................4-17
Address Status Register (ADSR).......................................................................4-18
Address Mode Register (ADMR)......................................................................4-20
Command Pass Through Register (CPTR)........................................................4-23
Auxiliary Mode Register (AUXMR).................................................................4-24
Hidden Registers................................................................................................4-31
Internal Counter Register (ICR).............................................................4-31
Parallel Poll Register (PPR)...................................................................4-32
Auxiliary Register A (AUXRA)............................................................4-34
Auxiliary Register B (AUXRB).............................................................4-36
Auxiliary Register E (AUXRE).............................................................4-38
Address Register 0 (ADR0)...............................................................................4-39
Address Register (ADR)....................................................................................4-40
Address Register 1 (ADR1)...............................................................................4-41
End Of String Register (EOSR).........................................................................4-43
Chapter 5
Programming Considerations........................................................................................5-1
Initialization...................................................................................................................5-1
The GPIB-SBX as GPIB Controller..............................................................................5-2
Becoming Controller-In-Charge (CIC) and Active Controller..........................5-2
Sending Remote Multiline Messages (Commands)...........................................5-3
Going from Active to Standby Controller..........................................................5-3
Going from Standby to Active Controller..........................................................5-4
Going from Active to Idle Controller................................................................5-4
The GPIB-SBX as GPIB Talker and Listener...............................................................5-5
Programmed Implementation of Talker and Listener........................................5-5
Addressed Implementation of Talker and Listener............................................5-5
Address Mode 1.....................................................................................5-5
Address Mode 2.....................................................................................5-5
Address Mode 3.....................................................................................5-6
Sending/Receiving Messages.........................................................................................5-7
Sending and Receiving Data (Programmed I/O Mode).....................................5-7
Sending and Receiving Data (DMA Mode).......................................................5-7
Sending END or EOS........................................................................................5-8
Terminating on END or EOS.............................................................................5-8
Serial Polls.....................................................................................................................5-8
Conducting Serial Polls......................................................................................5-8
Responding to a Serial Poll................................................................................5-8
Parallel Polls..................................................................................................................5-9
Conducting a Parallel Poll..................................................................................5-9
Responding to a Parallel Poll.............................................................................5-10
Interrupts........................................................................................................................5-11

Contents
GPIB-SBX User Manual x© National Instruments Corporation
Chapter 6
Theory of Operation..........................................................................................................6-1
SBX Bus Interface.........................................................................................................6-1
GPIB Talker/Listener/Controller (TLC)........................................................................6-2
GPIB Interface...............................................................................................................6-3
Chapter 7
Diagnostic and Troubleshooting Test Procedures..................................................7-1
Interpreting Test Procedures..........................................................................................7-1
GPIB-SBX Hardware Installation Tests........................................................................7-2
Appendix A
Parts Listand SchematicDiagram .............................................................................A-1
Appendix B
SamplePrograms................................................................................................................B-1
Appendix C
MultilineInterfaceMessages..........................................................................................C-1
Appendix D
MnemonicsKey...................................................................................................................D-1
Index..................................................................................................................................Index-1

Contents
GPIB-SBX User Manual xi© National Instruments Corporation
Figures
Figure1-1. GPIB-SBX Interface Board .............................................................................1-1
Figure2-1. GPIB-SBX with a Multibus Computer............................................................2-11
Figure2-2. GPIB-SBX in a Multiprocessor Application....................................................2-12
Figure2-3. GPIB-SBX Block Diagram..............................................................................2-13
Figure3-1. GPIB Cable Shield Grounding.........................................................................3-1
Figure3-2. GPIB-SBX Installed on Host Board.................................................................3-2
Figure3-3. GPIB Cable Connector.....................................................................................3-3
Figure3-4. GPIB-SBX Cable-to-Interface Board Connection...........................................3-4
Figure4-1. GPIB-SBX Interface Registers.........................................................................4-3
Figure4-2. Writing to the Hidden Registers.......................................................................4-4
Tables
Table2-1. Electrical Connections of the GPIB-SBX Interface.........................................2-1
Table2-2. Loading on Incoming SBX Signal Lines.........................................................2-2
Table2-3. Drive Capability of Output SBX Signal Lines.................................................2-2
Table2-4. GPIB-SBX Connector Pin Assignments..........................................................2-3
Table2-5. GPIB-SBX Internal Registers..........................................................................2-6
Table2-6. GPIB-SBX IEEE-488 Interface Capabilities...................................................2-14
Table4-1. Clues to Understanding Mnemonics................................................................4-1
Table4-2. Auxiliary Command Summary........................................................................4-25
Table4-3. Auxiliary Commands: Detail Description........................................................4-26
Table4-4. Examples for Configuring the PPR..................................................................4-33