Technical data

68 Agilent Connectivity Guide

3 Connecting Instruments to GPIB

• The default formatted IO write buffer size is 128 so when using

this default size, formatted writes in SICL (with hint =

I_HINT_DONTCARE) and VISA (with

VI_ATTR_DMA_ALLOW_EN = VI_TRUE) will used Polling

mode even when a large number of bytes are being sent.

• In SICL, Polling mode will always be used for the iread(),

ifread() and iscanf() regardless of the above settings,

when a termchr is set (itermchr() is not set to -1).

• In VISA, Polling mode will always be used for viRead(),

viBufRead() and viScanf() regardless of the above

settings, when VI_ATTR_TERM_CHAR_EN = VI_TRUE.

The

crossover point at which the Interrupt mode becomes faster then the

Polling mode depends on the CPU speed, with a faster CPU having a

higher crossover point.

Agilent IO Libraries Suite Checks

This section gives troubleshooting guidelines for the Agilent IO

Libraries Suite, including:

• Check IO Libraries Suite Installation

• Check Agilent IO Control Operation

• Install IO Libraries Suite (if 82350 was Installed First)

Check IO Libraries Suite Installation Start your Agilent IO

Libraries Suite troubleshooting sequence by verifying IO Libraries Suite

installation. If the IO Libraries Suite is installed, go to Check Agilent IO

Control Operation.

Check Agilent IO Libraries Suite Version. If Agilent IO Libraries Suite

version 15.0 or later is installed, a blue IO icon ( ) is normally

displayed in the Windows notification area (on the lower right side of

the screen).