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Figure 4. Status Byte and Service Request (SRQ)
Status Summary Messages
* STB ?
Serial Poll
(B15 - B8)
OSB
(B7)
MSS
RQS
(B6)
ESB
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2)
(B1)
(B0)
OR
* SRE
* SRE ?
Status Byte
Register
Service Request
Enable Register
OSB = Operation Summary Bit
MSS = Master Summary Status (IEEE-488.2)
RQS = Request for Service (IEEE-488.1)
ESB = Event Summary Bit
MAV = Message Available
QSB = Questionable Summary Bit
EAV = Error Available
& = Logical AND
OR = Logical OR
(B15 - B8)
OSB
(B7)
(B6)
ESB
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2)
(B1)
(B0)
&
&
&
&
&
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