Appendix E: Status model
2606B System SourceMeter® Instrument Reference Manual
E-14
2606B-901-01 Rev. B / May 2018
Figure 151: Status byte and service request (SRQ)
The bits of the Status Byte Register are:
•
Bit B0, Measurement Summary Bit (MSB):
When set, indicates that an enabled measurement
event has occurred.
•
Bit B1, System Summary Bit (SSB):
When set, indicates that an enabled system event has
occurred.
•
Bit B2, Error Available (EAV):
When set, indicates that an error or status message is present in
the error queue.
•
Bit B3, Questionable Summary Bit (QSB):
When set, indicates that an enabled questionable
event has occurred.
•
Bit B4, Message Available (MAV):
When set, indicates that a response message is present in
the output queue.
•
Bit B5, Event Summary Bit (ESB):
When set, indicates that an enabled standard event has
occurred.
•
Bit B6, Request Service (RQS)/Master Summary Status (MSS):
When set, 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 a USB or VXI-11 serial poll sequence of the 2606B to obtain the status byte
(serial poll byte), B6 is the RQS bit. See
(on page E-15) for details on
using the serial poll sequence.
When using the
*STB?
common command or status.condition
(on page E-15) to read the status byte, B6 is the MSS bit.
•
Bit B7, Operation Summary (OSB):
When set, indicates that an enabled operation event has
occurred.