Language Dictionary - 8

*SRE

This command sets the condition of the Service Request Enable Register. This register determines which bits from the Status Byte Register (see *STB for its bit configuration) are allowed to set the Master Status Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service Request Enable Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are logically ORed to cause Bit 6 of the Status Byte Register to be set.

When the controller conducts a serial poll in response to SRQ, the RQS bit is cleared, but the MSS bit is not. When *SRE is cleared (by programming it with 0), the dc source cannot generate an SRQ to the controller. The query returns the current state of *SRE.

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 dc source has one or more reasons for requesting service.

Table 8-8. 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)

139

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Agilent Technologies 66111A, D, 66311B Power-on Value, Query Syntax *STB?, 139, Bit Configuration of Status Byte Register
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66111A, 66309B, 66311B, D specifications

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