27
Figure 6. Status byte and service request (SRQ)
Status Summary Messages
* STB?
Serial Poll
OSB
(B7)
RQS
(B6)
MSS
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
RQS = Request for Service
ESB = Event Summary Bit
MAV = Message Available
QSB = Questionable Summary Bit
EAV = Error Available
MSB = Measurement Summary Bit
& = Logical AND
OR = Logical OR
OSB
(B7) (B6)
ESB
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2)
(B1) (B0)
&
&
&
&
&
MSB
MSB
&
Service
Request
Generation
Read by Serial Poll
Read by *STB?
2000-903-01A Page 27 Thursday, December 23, 1999 7:52 AM
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