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Appendix C: Status model
Series 2200 Programmable DC Power Supplies Reference Manual
C-4
2200S-901-01 Rev. C / March 2016
SBR bit functions
Bit
Function
7 (MSB)
OSB
Operation Status Bit. Indicates that an operation event has occurred.
6
RQS
Request Service. Obtained from a serial poll. Shows that the power supply
requests service from the GPIB controller.
6
MSS
Master Status Summary. Obtained from *STB? query. Summarizes the OSB,
ESB, MAV, QSB, and EQS bits in the SBR.
5
ESB
Event Status Bit. Shows that status is enabled and present in the SESR.
4
MAV
Message Available. Shows that output is available in the Output Queue.
3
QSB
Questionable Status Bit. Indicates that a questionable event has occurred.
2
EQS
Shows that information is available in the Error/Event Queue.
1
————
Not used.
0
————
Not used.
Standard event status register (SESR)
The standard event status register records six types of events that can occur within the power supply
as shown in the following figure.
Figure 27: Standard event status register (SESR)
SESR bit functions
Bit
Function
7 (MSB)
PON
Power On. Shows that the power supply was powered
6
————
This bit is not used.
5
CME
Command Error. Shows that an error occurred while the power supply was
parsing a command or query.
4
EXE
Execution Error. Shows that an error occurred while the power supply was
executing a command or query.
3
DDE
Device Error. Shows that a device dependent error occurred.
2
QYE
Query Error. Either an attempt was made to read the Output Queue when no
data was present or pending, or that data in the Output Queue was lost.
1
————
This bit is not used.
0 (LSB)
OPC
Operation Complete. Shows that the operation is complete. This bit is set
when all pending operations complete following an *OPC command.