Keithley SourceMeter 2600 Series Reference Manual page 268

11-8 Communications Interfaces
LLO (local lockout)
When the unit is in remote operation, all front panel controls are disabled except
the LOCAL and OUTPUT OFF keys (and of course the POWER switch). The LLO
command disables the LOCAL key, but it does not affect OUTPUT OFF, which
cannot be disabled.
GTL (go to local)
Use the GTL command to put a remote-mode instrument into local mode. Leaving
the remote state also restores operation of all front panel controls.
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 SourceMeter 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.
GET (group execute trigger)
GET is a GPIB trigger that is used to trigger the instrument to take readings by
remote.
SPE, SPD (serial polling)
Use the serial polling sequence to obtain the SourceMeter serial poll byte. The
serial poll byte contains important information about internal functions. (See
Appendix
determine which of several instruments has requested service with the SRQ line.
The serial polling sequence may be performed at any time to obtain the status
byte from the SourceMeter.
2600S-901-01 Rev. A / May 2006
D.) Generally, the serial polling sequence is used by the controller to
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Series 2600 System SourceMeters Reference Manual
Section 11 topics