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Chapter 5 Using GPIB Interface
166
The following figure illustrates IEEE-488 status reporting.
7
6
5
4
&
&
&
&
7
6
5
4
Service
Request
Generation
Status byte bit
Definition
MAV
Message available. Indicates that at least one complete response is present in
the output buffer.
ESB
Event status bit. Indicates that one of the enabled conditions in the Standard
Event Status register is set.
MSS
Master summary status. Indicates that the generator has a reason for requesting
service.
RQS
Request service. This bit is read only by executing a serial poll of the generator.
Standard
3
2
1
0
Event Status Register
&
&
&
&
3
2
1
0
Standard
Event Status Enable
Register
RQS
Status Byte Register
7
6 ESB MA V
3
2
1
0
MSS
&
&
&
&
&
&
&
Service Request
7
6
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4
3
2
1
0
Enable Register
Queue
Not-Empty
Output Queue
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