C-14
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2600AS-901-01 Rev. B / September 2008
Appendix C: Status Model
Series 2600A System SourceMeter® Instruments Reference Manual
example, if the Standard Event Register is read, its register will clear. As a result, its summary
message will reset to 0, which in turn will reset the ESB bit in the Status Byte Register.
Figure C-10
Status byte and service request (SRQ)
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 instrument to obtain the
status byte (serial poll byte), B6 is the RQS bit. See
for details on
using the serial poll sequence.
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
