Keithley 2182, User Manual, Page: 185 / 339

Remote Operation 11-11
Program Fragment
CALL TRANSMIT (“UNL LISTEN 7 LLO”, status%)‘ Lock out front panel.
CALL TRANSMIT (“UNL LISTEN 7 GTL”, status%)‘ Lock out front panel.
GTL (go to local)
Use the GTL command to put a remote mode instrument into local mode. The GTL command
also restores front panel key operation.
Program Fragment
CALL TRANSMIT (“MTA LISTEN 7 REN”, status%)‘ Place 2182 in remote.
CALL TRANSMIT (“UNL LISTEN 7 GTL”, status%)‘ Place 2182 in local mode
DCL (device clear)
Use the DCL command to clear the GPIB interface and return it to a known state. Note that
the DCL command is not an addressed command, so all instruments equipped to implement
DCL will do so simultaneously.
When the Model 2182 receives a DCL command, it clears the Input Buffer and Output Queue,
cancels deferred commands, and clears any command that prevents the processing of any other
device command. A DCL does not affect instrument settings and stored data.
Program fragment
CALL TRANSMIT (“DCL”, status%)‘ Clears all devices.
SDC (selective device clear)
The SDC command is an addressed command that performs essentially the same function as
the DCL command. However, since each device must be individually addressed, the SDC
command provides a method to clear only selected instruments instead of clearing all
instruments simultaneously, as is the case with DCL.
Program fragment
CALL TRANSMIT (“UNL LISTEN 7 SDC”, status%)‘ Clears 2182.
GET (group execute trigger)
GET is a GPIB trigger that is used as an event to control operation. The Model 2182 reacts to
this trigger if it is the programmed control source. The control source is programmed from the
SCPI TRIGger subsystem.
With the instrument programmed and waiting for a GPIB trigger, the following program
fragment will provide the GET:
Program fragment
CALL TRANSMIT (“UNL LISTEN 7 GET”, status%) ‘ Trigger 2182 from over
the bus.
When the command is executed, the trigger event for the 2182 occurs. Any other listeners
ignore the trigger.