Agilent Technologies HP 16500B Manual page 86

Status Reporting
Parallel Poll
Figure 6-3 shows the Parallel Poll Data Structure. The summary bit is sent in
response to a Parallel Poll. This summary bit is the "ist" (individual status)
local message.
The Parallel Poll Enable Register determines which events are summarized in
the ist. The *PRE command is used to write to the enable register and the
*PRE? query is used to read the register. The *IST? query can be used to
read the "ist" without doing a parallel poll.
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