Language Dictionary - 8
135
A serial poll also returns the value of the Status Byte register, except that bit 6 returns Request for
Service (RQS) instead of Master Status Summary (MSS). A serial poll clears RQS, but not MSS. When
MSS is set, it indicates that the dc source has one or more reasons for requesting service.
Table 8-8. Bit Configuration of Status Byte Register
Bit Position 7 6 5 4 3 2 1 0
Bit Name OPER MSS
(RQS)
ESB MAV QUES 0 0 0
Bit Weight 128 64 32 16 8 4 2 1
ESB = Event status byte summary
MAV = Message available
MSS = Master status summary
OPER = Operation status summary
QUES = Questionable status summary
RQS = Request for service
Query Syntax
*STB?
Returned Parameters
<NR1>(Register binary value)
*TRG
This common command generates a trigger when the trigger subsystem has BUS selected as its source.
The command has the same affect as the Group Execute Trigger (<GET>) command.
Command Syntax
*TRG
Parameters
None
Related Commands
ABOR INIT TRIG[:IMM] <GET>
*TST?
This query causes the dc source to do a self-test and report any errors. 0 indicates that the dc source
passed self-test. 1 indicates that one or more tests failed. Selftest errors are written to the error queue (see
Appendix C).
Query Syntax
TST?
Returned Parameters
<NR1>
*WAI
This command instructs the dc source not to process any further commands until all pending operations
are completed. "Pending operations" are as defined under the *OPC command. *WAI can be aborted
only by sending the dc source an GPIB DCL (Device Clear) command.
Command Syntax
*WAI
Parameters
None
Related Commands
*OPC* OPC?
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