Keithley 2651A Reference Manual page 773

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 139: Status byte and service request (SRQ)
Service
Request
Generation
2651A-901-01 Rev. A / March 2011
*STB?
OSB
Serial Poll (B7)
MSS
&
OR
*SRE or OSB
status.request_enable (B7)
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
SSB = System Summary Bit
MSB = Measurement Summary Bit
& = Logical AND
OR = Logical OR
Status Summary Message
RQS
ESB MAV QSB EAV
(B6)
(B5) (B4) (B3) (B2) (B1)
&
&
&
&
__
ESB MAV QSB EAV
(B6) (B5) (B4) (B3) (B2) (B1) (B0)
Appendix E: Status model
Read by Serial Poll
MSB
SSB
Status Byte
Register
(B0)
Read by *STB?
or print(status.condition)
&
&
Service
SSB MSB
Read by *SRE?
Request
or print(status.request_enable)
Enable
Register
E-15