Agilent Technologies 8960 10 Series Reference Manual page 472

Standard Event Status Register
Bit Binary
Number Weighting
2 4
1 2
0 1
Program Example - Standard Event Status Register
OUTPUT 714;"*ESR?" !Queries (reads) the Standard Event Status Register.
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S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\hpib_STATUS_STD_EVNT.fm
Condition
Query Error
Reserved for future use.
Operation Complete
Description
This bit is set to 1 if an error has occurred while
trying to read the test set's output queue. The
following events cause a query error:
• An attempt is made to read data from the output
queue when no data is present or is pending.
• Data in the output queue has been lost. An
example of this would be an output queue overflow.
This bit will always be 0.
This bit is set to 1 when the test set has completed all
pending operations and is ready to accept new
commands. This bit is only generated in response to
the *OPC IEEE 488.2 common command.