Dcl (Device Clear) - Keithley 6430 Instruction Manual

13-8 Remote Operations

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 com-
mand 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 as an arm event to control operation. The SourceMeter
reacts to this trigger if it is the programmed arm control source. The following command
selects the GPIB arm control source:
:ARM:SOURce BUS
NOTE
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 Section 14. Generally, the
serial polling sequence is used by the controller to determine which of several instruments has
requested service with the SRQ line. However, the serial polling sequence may be performed at
any time to obtain the status byte from the SourceMeter.
With :ARM:SOURce BUS selected and an :INITiate command sent, do not send any
commands (except GET, DCL, SDC, IFC, *TRG, and :ABORt) while performing
source-measure operations (ARM annunciator on). If you do, erratic operation will
occur.