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Language Dictionary - 3
119
*STB?
This query reads the Status Byte register, which contains the status summary bits and the Output Queue
MAV bit. Reading the Status Byte register does not clear it. The input summary bits are cleared when the
appropriate event registers are read (see Chapter 4 under “Programming the Status Registers” for more
information). 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 has one or more reasons for requesting service.
Bit Configuration of Status Byte Register
Bit
Position
7 6 5 4 3 2-0
Bit Name OPER MSS
RQS
ESB MAV QUES not
used
Bit Weight 128 64 32 16 8
OPER operation status summary MSS master status summary
ESB event status byte summary RQS request for service
QUES questionable status summary MAV message available
Query Syntax
*STB?
Parameters
None
Returned Parameters
<NR1> (register value)
Related Commands
*SRE *ESR *ESE
*TRG
This command generates a trigger to any subsystem that has BUS selected as its source (for example,
TRIG:SOUR BUS). The command has the same affect as the Group Execute Trigger (<GET>) command.
Command Syntax
*TRG
Parameters
None
Related Commands
ABOR INIT TRIG:IMM
*TST?
This query causes the ac source to do a self-test and report any errors.
Query Syntax
TST?
Parameters
None
Returned Parameters
<NR1> 0 indicates the ac source has passed selftest.
Non-zero indicates an error code (see appendix C)