National Instruments NI-488.2 - Manual (Page 7)

Contents
NI-488.2 User Manual viii ni.com
Chapter 7
Interactive Control Utility
Overview ....................................................................................................................... 7-1
Getting Started with Interactive Control ....................................................................... 7-1
Interactive Control Syntax............................................................................................. 7-4
Number Syntax ............................................................................................... 7-4
String Syntax................................................................................................... 7-5
Address Syntax ............................................................................................... 7-5
Interactive Control Commands...................................................................................... 7-5
Status Word ................................................................................................................... 7-11
Error Information........................................................................................................... 7-11
Count Information ......................................................................................................... 7-12
Chapter 8
NI-488.2 Programming Techniques
Termination of Data Transfers ...................................................................................... 8-1
High-Speed Data Transfers (HS488)............................................................................. 8-2
Enabling HS488 .............................................................................................. 8-2
System Configuration Effects on HS488 ........................................................ 8-3
Waiting for GPIB Conditions........................................................................................ 8-4
Asynchronous Event Notification in NI-488.2 Applications ........................................ 8-4
Calling the ibnotify Function .......................................................................... 8-4
ibnotify Programming Example...................................................................... 8-6
Writing Multithreaded NI-488.2 Applications .............................................................. 8-9
Device-Level Calls and Bus Management .................................................................... 8-11
Talker/Listener Applications ......................................................................................... 8-12
Serial Polling ................................................................................................................. 8-12
Service Requests from IEEE 488 Devices ...................................................... 8-13
Service Requests from IEEE 488.2 Devices ................................................... 8-13
Automatic Serial Polling ................................................................................. 8-13
Stuck SRQ State ............................................................................... 8-14
Autopolling and Interrupts................................................................ 8-14
SRQ and Serial Polling with Device-Level Traditional NI-488.2 Calls......... 8-15
SRQ and Serial Polling with Multi-Device NI-488.2 Calls............................ 8-15
Example 1: Using FindRQS ............................................................. 8-16
Example 2: Using AllSpoll............................................................... 8-17
Parallel Polling .............................................................................................................. 8-17
Implementing a Parallel Poll........................................................................... 8-17
Parallel Polling with Traditional NI-488.2 Calls.............................. 8-18
Parallel Polling with Multi-Device NI-488.2 Calls .......................... 8-19