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

5

4

3

2

1

Bit Name

OPER

 

MSS

ESB

MAV

QUES

0

0

 

 

 

(RQS)

 

 

 

 

 

Bit Weight

128

 

64

32

16

8

4

2

ESB = Event status byte summary

 

OPER = Operation status summary

MAV = Message available

 

 

QUES = Questionable status summary

MSS = Master 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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