Keithley 2510

Models 2510 and 2510-AT User’s Manual Status Structure 7-7
Status byte and service request (SRQ)
Service request is controlled by two 8-bit registers; the Status Byte Register and the Ser-
vice Request Enable Register. Figure 7-3 shows the structure of these registers.
Figure 7-3
Status byte and service request (SRQ)
ESB
OSB
ESB
*STB?
OSB*SRE
*SRE?
OR
(B6)
RQS
(B5)(B7)
(B5)(B6)
Serial Poll
Service
Request
Generation
(B7)
MSS
MAV
Status Summary Message
Read by Serial Poll
Read by *STB?
Status Byte
Register
OSB = Operation Summary Bit
QSB = Questionable Summary Bit
Service
Request
Enable
Register
MAV
(B4)
(B4)
QSB
QSB
(B3)
(B3)
EAV
EAV
(B2)
(B2)
(B1)
(B1)
MSB
MSB
(B0)
(B0)
__
____
&
&
&
&
&
&
MSS = Master Summary Status
RQS = Request for Service
ESB = Event Summary Bit
MAV = Message Available
EAV = Error Available
MSB = Message Summary Bit
& = Logical AND
OR = Logical OR