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Command Syntax
Parameters
Power-on Value
Example
Query Syntax
Returned Parameters
Related Commands
CAUTION:
If *PSC is programmed to 0, the *SRE command causes a write cycle to nonvolatile
memory. Nonvolatile memory has a finite maximum number of write cycles. Programs
that repeatedly cause write cycles to nonvolatile memory can eventually exceed the
maximum number of write cycles and cause the memory to fail.
*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. The MAV bit is cleared at power-on, by *CLS' or when there is no
more response data available.
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 Position
7
Bit Name
OPER
Bit Weight
128
ESB = Event status byte summary
MAV = Message available
MSS = Master status summary
Query Syntax
Returned Parameters
*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
Parameters
Related Commands
*SRE <NRf>
0 to 255
see *PSC
*SRE 20
*SRE?
<NR1> (register binary value)
*ESE
*ESR
Table 4-7. Bit Configuration of Status Byte Register
6
5
MSS
ESB
MAV
(RQS)
64
32
16
OPER = Operation status summary
QUES = Questionable status summary
RQS = Request for service
*STB?
<NR1>(Register binary value)
WAI?
None
*OPC*OPC?
*PSC
4
3
2
QUES
0
8
4
Language Dictionary - 4
1
0
0
0
2
1
67
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