Agilent Technologies 66312A, 6634B, 6633B Stb?, Wai, NR1 register binary value, Query Syntax *STB?

Language Dictionary - 4

Command Syntax	*SRE <NRf>
Parameters	0 to 255
Power-on Value	see *PSC
Example	*SRE 20
Query Syntax	*SRE?
Returned Parameters	<NR1> (register binary value)
Related Commands	*ESE *ESR *PSC

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.

Table 4-7. Bit Configuration of Status Byte Register

Bit Position	7	6
Bit Name	OPER	MSS
		(RQS)
Bit Weight	128	64

ESB = Event status byte summary MAV = Message available

MSS = Master status summary

5

ESB

32

4	3	2	1
MAV	QUES	0	0
16	8	4	2

OPER = Operation status summary QUES = Questionable status summary RQS = Request for service

0

0

1

Query Syntax *STB?

Returned Parameters <NR1>(Register binary value)

*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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