2600S-901-01 Rev. C / January 2008 Return to Section Topics D-11
Series 2600 System SourceMeter® Instruments Reference Manual Appendix D: Status Model
Figure D-7
Status byte and service request (SRQ)
Service
Request
Enable
Register
Status Summary Message
Read by Serial Poll
Read by *STB?
or print(status.condition)
OSB = Operation Summary Bit
RQS = Request for Service
MSS = Master Summary Status
Mav = Message Available
ESB = Event Summary Bit
EAV = Error Available
QSB = Questionable Summary Bit
MSB = Measurement Summary Bit
& = Logical AND
OR = Logical OR
OR
&
&
&
&
&
&
*SRE or OSB
(B5)(B6)(B7)
MAV
(B4)
QSB
(B3)
EAV
(B2) (B1) (B0)
__
MSB
*STB?
Serial Poll
Service
Request
Generation
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2) (B1)
MSB
(B0)
Status Byte
Register
OSB
(B6)
RQS
(B7)
SSB
SSB
&
MSS
ESB
ESB
SSB = System Summary Bit
Read by *SRE?
or print(status.request_enable)
status.request_enable
The bits of the Status Byte Register are described as follows:
• Bit B0, Measurement Summary Bit (MSB) — Set summary bit indicates that an enabled
measurement event has occurred.
• Bit B1, System Summary Bit (SSB) — Set summary bit indicates that an enabled system
event has occurred.
• Bit B2, Error Available (EAV) — Set bit indicates that an error or status message is
present in the Error Queue.
• Bit B3, Questionable Summary Bit (QSB) — Set summary bit indicates that an enabled
questionable event has occurred.
• Bit B4, Message Available (MAV) — Set bit indicates that a response message is present
in the Output Queue.
• Bit B5, Event Summary Bit (ESB) — Set summary bit indicates that an enabled standard
event has occurred.
• Bit B6, Request Service (RQS)/Master Summary Status (MSS) — Set bit indicates that
an enabled summary bit of the Status Byte Register is set. Depending on how it is used, Bit
B6 of the Status Byte Register is either the Request for Service (RQS) bit or the Master
Summary Status (MSS) bit:
• When using the GPIB serial poll sequence of the SourceMeter to obtain the status byte
(serial poll byte), B6 is the RQS bit. See “
Serial polling and SRQ” for details on using the
serial poll sequence.
• When using the *STB? common command or status.condition (Table D-3) to read
the status byte, B6 is the MSS bit.
• Bit B7, Operation Summary (OSB) — Set summary bit indicates that an enabled
operation event has occurred.
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