Keithley 2601 Reference Manual page 519

Series 2600 System SourceMeter® Instruments Reference Manual
Figure D-7
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:
•
•
• Bit B7, Operation Summary (OSB) — Set summary bit indicates that an enabled
operation event has occurred.
2600S-901-01 Rev. C / January 2008
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 poll sequence.
When using the *STB? common command or status.condition
the status byte, B6 is the MSS bit.
Return to
"Serial polling and
Section Topics
Appendix D: Status Model
SRQ" for details on using the
(Table D-3) to read
D-11