Status and Events
Table 3-1: SESR
Bit Functions
Bit Function
7 (MS B) PON Power On. Show
s that the instrument was powered on. On
completion, the diagnostic tests also set this bit.
6
URQ
User Request
. Indicates that an application event has
occurred. *See preceding note.
5
CME Command Error. Shows that an error occurred while the
instrument was parsing a command or query.
4 EXE
Execution Error. Shows that an error executing a command
or query.
3DDE
Device Err
or. Shows that a device error occurred.
2
QYE Query Err
or. 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
RQC Request Control. This is not used.
0 (LSB) OPC Operation Complete. Shows that the operation is complete.
This bi
t is s et when all pending operations complete
following an *OPC command.
The Status Byte Register (SBR). Records whether output is available in the
Output Queue, whether the instrument requests service, and whether the SESR
has r
ecorded any events.
Use a Serial Poll or the *STB? query to read the contents of the SBR. The bits in
the SBR are set and cleared depending on the contents of the SESR, the Event
Status Enable Register (ESER), and the Output Queue. When you use a Serial
Poll to obtain the SBR, bit 6 is the RQS bit. When you use the *STB? query to
obtain the SBR, bit 6 is the MSS bit. Reading the SBR does not clear the b its.
Table 3-2: SBR Bi
t Functions
Bit Function
7(MSB)
————
Not used.
6
RQS Request Servic
e. Obtained from a serial poll. Shows that
the instrument requests service from the GPIB controller.
6
MSS Master Status Summary. Obtained from *STB? query.
Summarizes the ESB and MAV bits in the SBR.
5
ESB Event Status Bit. Shows that status is enabled and present
in the SESR.
4MAV
Message Avai
lable. Shows that output is available in the
Output Queue.
3-2 DPO7000, DPO70000/B and DSA7000/B Series Programmer Manual
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