Status Byte Register

Status Byte Register

Last updated: January 16, 2009

*STB?

   
NOTE
The Status Byte Register can also be read with a serial poll. For example, the command "Status_byte = SPOLL(714)" would perform a serial poll of the Status Byte Register, returning and releasing RQS (bit 6).
   

Status Byte Register Bit Assignments

Bit Number

Binary Weighting

 Label

Description

7

128

 STATus: OPERation Summarizes the STATus: OPERationStatus Register, which fans out to theNMRReady and CALL Status Registers.

6

64

 RQS (SRQ TRUE?)/Master Summary Status RQS is read by a serial poll (SPOLL)Master Summary Status is read by a *STB? query - defined by IEEE 488.2

5

32

 Standard Event Status Register Summarizes the Standard Event Status Register

4

16

 Message Available SCPI - Defined

3

8

 STATus: QUEStionableStatus Register Summary Message comes from theSTATus: QUEStionable Status Register,which fans out to the CALL andHARDware Status Registers

2

4

 Error/ Event Queue SCPI - Defined

1

2

 Reserved

0

1

 Reserved

Program Example - Status Byte Register Bit Assignments

 
OUTPUT 714;"*STB?" !Queries the Status Byte.