Chapter 3 3-15
GPIB Programming
GPIB Operation
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
(PPU) 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 ) are disabled. Changing the analyzer's GPIB 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 “Status
Reporting” on page 6-3. To 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.
Local
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