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10-8
IFC (interface clear)
The IFC command is sent by the controller to place the Model 2790 in the local, talker, lis-
tener idle states. The unit responds to the IFC command by canceling front panel TALK or
LSTN lights, if the instrument was previously placed in one of these states.
Note that this command does not affect the status of the instrument. Settings, data, and
event registers are not changed.
With auto output off enabled (SOURce1:CLEar:AUTO ON), the output will remain on if
operation is terminated before the output has a chance to automatically turn off.
To send the IFC command, the controller need only set the IFC line true for a minimum of
100µs.
LLO (local lockout)
Use the LLO command to prevent local operation of the instrument. After the unit receives
LLO, all of its front panel controls except OUTPUT OFF are inoperative. In this state,
pressing LOCAL will not restore control to the front panel. The GTL command restores
control to the front panel. Cycling power will also cancel local lockout.
GTL (go to local)
Use the GTL command to put a remote-mode instrument into local mode. The GTL com-
mand also restores front panel key operation.
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 2790 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.
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.
Model 2790 SourceMeter
®
Switch System Reference Manual
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