Logical or – Quantum Data 881 User Manual
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Chapter 5 Using GPIB Interface
The following figure illustrates IEEE-488 status reporting.
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.
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Logical OR
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ESBMAV
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1
0
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0
RQS
MSS
Service
Request
Generation
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Logical OR
Po
w
er On
User Request
Command Erro
r
Ex
ecution Error
De
vice Dependent Error
Quer
y Error
Request Control
Oper
ation Complete
Queue
Not-Empty
Output Queue
Standard
Event Status Register
Standard
Event Status Enable
Register
Status Byte Register
Service Request
Enable Register
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