Measurement Computing Analyzer488 - Manual (Page 217)

Section 6 Instrument Simulator
6.7
6.7.3 Device Clear (DCL and SDC)
Device Clear resets the Analyzer488 to the power on defaults. Any
pending Service Requests (SRQ) and errors are cleared.
6.7.4 Interface Clear (IFC)
IFC places the Analyzer488 in the Talker/Listener Idle State. It clears
any pending SRQs. The condition which caused the SRQ remains
unmodified.
6.7.5 Serial Poll Enable (SPE)
When Serial Poll Enabled, the Analyzer488 sets itself to respond to a
serial poll with its serial poll register byte if addressed to talk. The serial poll
response is set by using the Serial Poll Response (Sn) command. When the
serial poll byte is accepted by the controller, any pending SRQs are cleared.
The Analyzer488 will continue to try to output its serial poll response until it
is 'Serial Poll Disabled' by the controller.
6.7.6 Serial Poll Disable (SPD)
Disables the Analyzer488 from responding to serial polls by the
controller.
6.7.7 Unlisten (UNL)
UNL places the Analyzer488 in the Listener Idle State.
6.7.8 Untalk (UNT)
UNT places the Analyzer488 in the Talker Idle State.
6.7.9 Parallel Poll (PP)
When Parallel Polled, the Analyzer488 outputs its parallel poll register
byte. The parallel poll response is set by using the Parallel Poll Response
(Pn) command.