National Instruments GPIB-120A - Manual (Page 6)

© National Instruments Corporation vii GPIB-120A User Manual
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
............................................................................................................................1-1
Description of the GPIB-120A ........................................................................................1-1
What You Need to Get Started ........................................................................................1-3
Optional Equipment .........................................................................................................1-3
Unpacking Your GPIB-120A...........................................................................................1-3
Chapter 2
Connection
...............................................................................................................................2-1
Isolation Considerations...................................................................................................2-1
Placing Your Instruments.................................................................................................2-2
Connecting the GPIB-120A .............................................................................................2-2
Connecting to Hewlett-Packard Controllers ........................................................2-2
Mounting the GPIB-120A................................................................................................2-2
Chapter 3
Theory of Operation
............................................................................................................3-1
Circuitry of the GPIB-120A.............................................................................................3-1
The GPIB-120A Front Panel............................................................................................3-2
Power On..............................................................................................................3-2
System Controller Detection................................................................................3-2
Active Controller Detection .................................................................................3-2
Source Handshake Detection ...............................................................................3-2
Data Direction Control.........................................................................................3-3
Parallel Poll Detection .........................................................................................3-3
Acceptable Identification Codes ......................................................................................3-4
Appendix A
Operation of the GPIB
........................................................................................................A-1
History of the GPIB .........................................................................................................A-1
GPIB Operation................................................................................................................A-1
Types of Messages ...............................................................................................A-1
Talkers, Listeners, and Controllers ......................................................................A-2
The Controller-In-Charge and System Controller ...............................................A-2
GPIB Signals and Lines .......................................................................................A-3
Data Lines ................................................................................................A-3
Handshake Lines ......................................................................................A-3
NRFD (Not Ready For Data) .......................................................A-3