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Standard Event Status
Register (SESR)
3026 Programmer Manual
The SESR is made up of 8 bits. Each bit records the occurrence of a different
type of event, as shown in Figure 3-2 and Table 3-2. The contents of this register
are returned when the *ESR? query is used.
7
6
5
4
PON
CME EXE DDE QYE
Figure 3 2: The Standard Event Status Register (SESR)
Table 3 2: SESR bit functions
Bit
Function
7
Power On (PON). Indicates that the power to the instrument is on.
6
Not used.
5
Command Error (CME). Indicates that a command error has occurred while
parsing by the command parser was in progress.
4
Execution Error (EXE). Indicates that an error occurred during the execution of
a command. Execution errors occur for one of the following reasons:
H
When a value designated in the argument is outside the allowable range
of the instrument, or is in conflict with the capabilities of the instrument
H
When the command could not be executed properly because the
conditions for execution differed from those essentially required
3
Device Specific Error (DDE). An instrument error has been detected.
2
Query Error (QYE). Indicates that a query error has been detected by the
output queue controller. Query errors occur for one of the following reasons:
H
An attempt was made to retrieve messages from the output queue,
despite the fact that the output queue is empty or in pending status.
H
The output queue messages have been cleared despite the fact that they
have not been retrieved.
1
Not used.
0
Operation Complete (OPC). This bit is set with the results of the execution of
the *OPC command. It indicates that all pending operations have been
completed.
3
2
1
0
OPC
Status and Events
3 3
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