Local Lockout
If the analyzer receives the local-lockout command (LLO) while it is
in remote mode, it will disable the entire front panel except for the
line power switch. A local-lockout condition can only be cleared by
releasing the remote line, although the local command (GTL) will place
the instrument temporarily in local mode.
Parallel Poll
The analyzer does not respond to parallel-poll configure (PPC) or
parallel-poll unconfigure
(PPIJ)
messages.
Pass Control
If the analyzer is in pass-control mode, is addressed to talk, and receives
the take-control command (TCT), from the system control it will take
active control of the bus. If the analyzer is not requesting control, it will
immediately pass control to the system controller’s address. Otherwise,
the analyzer will execute the function for which it sought control of the
bus and then pass control back to the system controller.
Remote
The analyzer will go into remote mode when the remote line is asserted
and the analyzer is addressed to listen. While the analyzer is held in
remote mode, all front-panel keys (with the exception of
m)
are
disabled. Changing the analyzer’s HP-ID status from remote to local
does not affect any front-panel settings or values.
Serial
Poll
The analyzer will respond to a serial poll with its status byte, as defined
in the “Status Reporting” section of this document. lb initiate the
serial-poll sequence, address the analyzer to talk and issue a serial-poll
enable command (SPE). Upon receiving this command, the analyzer will
return its status byte. End the sequence by issuing a serial-poll disable
command (SPD). A serial poll does not affect the value of the status
byte, and it does not set the instrument to remote mode.
Trigger
In hold mode, the analyzer responds to device trigger by taking a single
sweep. The analyzer responds only to selected-device trigger (SDT). This
means that it will not respond to group execute-trigger (GET) unless it is
addressed to listen. The analyzer will not respond to GET if it is not in
hold mode.
l-26
HP-IB Programming and Command Reference Guide
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