Keithley 7999-6, Instruction Manual

Page: 43 / 89

3-16 Operation
Clearing registers and queues
When the relay unit is powered up, the bits of all registers in the status structure are clear
(set to 0) and the two queues are empty. Commands to reset the event and event enable regis-
ters, and the error queue are listed in Table 3-3. In addition to these commands, any enable reg-
ister can be reset by sending the 0 parameter value with the individual command to program the
register.
NOTE *RST has no effect on status structure registers and queues. See “Queues” for
details on the error queue.
Table 3-3
Common and SCPI commands — reset registers and clear queues
Commands Description Ref
To reset Standard
event register:
*ESE 0
or
*CLS
Reset all bits of the Standard Event Register to 0. Note 1
To clear error queue:
*CLS
Clear all messages from error queue Note 1
STATus
:QUEue
{:NEXT}?
:CLEar
STATus subsystem:
Error queue:
Read and clear the oldest error/status message.
Clear all messages from error queue.
Note 2
SYSTem
:ERRor?
:CLEar
SYSTem subsystem:
Read and clear the oldest error/status message.
Clear all messages from error queue.
Note 2
Notes:
1. The standard event enable register is not reset by STATus:PRESet (see “Status byte and service request
commands”).
2. STATus:PRESet has no effect on the error queue.
3. Use either of the two :CLEar commands to clear the error queue.
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