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NI-488.2 User Manual for Windows viii © National Instruments Corp.
! (Repeat Previous Function)............................................................. 5-15
- (Turn OFF Display) and + (Turn ON Display)............................... 5-15
n* (Repeat Function n Times) ........................................................... 5-16
$ (Execute Indirect File).................................................................... 5-16
Print (Display the ASCII String) ....................................................... 5-17
Buffer (Set Buffer Display Mode)..................................................... 5-17
Chapter 6
GPIB Spy
................................................................................................................... 6-1
Overview.......................................................................................................... 6-1
Starting GPIB Spy ........................................................................................... 6-1
Exiting GPIB Spy ............................................................................................ 6-2
Viewing Call Details........................................................................................ 6-2
GPIB Spy Configuration Options .................................................................... 6-3
Calls to Highlight .............................................................................. 6-3
Calls To Trap On............................................................................... 6-3
Buffer History ................................................................................... 6-3
Set Highlight Color ........................................................................... 6-3
Store Configuration ........................................................................... 6-4
GPIB Spy Output Options ............................................................................... 6-4
To Screen........................................................................................... 6-4
To File ............................................................................................... 6-4
Clear Screen....................................................................................... 6-4
GPIB Spy Help ................................................................................................ 6-5
Performance Considerations ............................................................................ 6-5
Chapter 7
GPIB Programming Techniques
..................................................................... 7-1
Termination of Data Transfers......................................................................... 7-1
High-Speed Data Transfers (HS488)............................................................... 7-2
Enabling HS488................................................................................. 7-2
System Configuration Effects on HS488 .......................................... 7-3
Waiting for GPIB Conditions .......................................................................... 7-3
Device-Level Calls and Bus Management....................................................... 7-3
Talker/Listener Applications ........................................................................... 7-4
Waiting for Messages from the Controller ........................................ 7-4
Using the Event Queue...................................................................... 7-5
Requesting Service ............................................................................ 7-5
Serial Polling ................................................................................................... 7-5
Service Requests from IEEE 488 Devices ........................................ 7-5
Service Requests from IEEE 488.2 Devices ..................................... 7-6
Automatic Serial Polling ................................................................... 7-6
Stuck SRQ State.................................................................. 7-6
Autopolling and Interrupts .................................................. 7-7
SRQ and Serial Polling with NI-488 Device Functions.................... 7-7
SRQ and Serial Polling with NI-488.2 Routines............................... 7-8
Example 1: Using FindRQS............................................... 7-9
Example 2: Using AllSpoll ................................................ 7-9