Language Dictionary 3
Keysight Models 6811C, 6812C, and 6813C Programming Guide 217
*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
(refer to “Programming the Status Registers” on page 259 in Chapter 5,
"Programming Examples" 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 ac source has one or more reasons for
requesting service.
Bit configuration of Status Byte register
Bit position 765432 - 0
Bit name OPER
MSS
RQS
ESB MAV QUES n.u.
Bit weight 128 64 32 16 8
n.u. = Not used
OPER = Operation status summary
MSS = Master status summary
RQS = Request for service
ESB = Event status byte summary
MAV = Message available
QUES = Questionable status summary
Query syntax *STB?
Parameters None
Returned parameters <NR1> (register value)
Related commands *SRE *ESR *ESE
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