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Programming Commands
Common Commands
*ESR? (Event Status Register)
Reads and clears the Standard Event Status register.
The register is cleared when it is read. The response value is an integer, to be
interpreted as a binary number, representing the bit values of the register.
When the standard event status register is read, the value returned is the total
of the weights of all the bits that are set to one at the time the byte is read.
The following table shows each bit in the event status register and its bit
weight. The register is cleared when it is read.
Bit
7
6
5
4
3
2
1
0
Syntax
*ESR?
Query Response
The response value is an integer, to be interpreted as a binary number, rep-
resenting the bit values of the register. The integer ranges from 0 to 255.
6-18
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Bit Weight
Bit Name
128
PON
64
32
CME
16
EXE
8
DDE
4
QYE
2
RQC
1
OPC
0 = False = Low
Condition
1 = OFF to ON transition has occurred.
Not Used. Permanently set to zero.
0 = no command errors.
1 = a command error has been detected.
0 = no execution error.
1 = an execution error has been detected.
0 = no device-dependent errors.
1 = a device-dependent error has been detected.
0 = no query errors.
1 = a query error has been detected.
0 = request control - NOT used - always 0.
0 = operation is not complete.
1 = operation is complete.
1 = True = High
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