Dcl (Device Clear); Sdc (Selective Device Clear) - Keithley 2000 User Manual

4-16 Remote 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 2000 multimeter receives a DCL command, it clears the Input Buffer and
Output Queue, cancels deferred commands, and clears any command that prevents the process-
ing of any other device command. A DCL does not affect instrument settings and stored data.
Program fragment
PRINT #1, "clear"

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 com-
mand provides a method to clear only selected instruments instead of clearing all instruments
simultaneously, as is the case with DCL.
Program fragment
PRINT #1, "clear 16"
'Clear all devices
'Clear 2000