Appendix C 253
Status Reporting System
Status Register Structure
C. Status Reporting System
Issuing the *CLS command will clear all bits from the standard event status register.
Table C-2 Status Bit Definitions of Event Status Register (ESR)
Bit
Position
Name Description
0 Operation Complete Set to “1” upon completion of all operations done by
commands that precede the *OPC command on page 125.
1 Not used Always 0
2 Query Error 1. Set to “1” when the 4288A receives a data output
request but there is no data to output.
2. Set to “1” when the data of the 4288A's output queue
has been cleared because of a new message received
before the completion of data output.
3 Device Dependent Error Set to “1” when an error has occurred and the error is not a
command, query, or execution error.
4 Execution Error 1. Set to “1” when any parameter in a GPIB command
exceeds its input range or is inconsistent with the
4288A’s capabilities.
2. Set to “1” when a GPIB command cannot be properly
executed due to some condition of the 4288A.
5 Command Error 1. Set to “1” when an IEEE 488.2 syntax error occurs (a
command sent to the 4288A does not follow the
IEEE 488.2 syntax). Possible violations include the
command parameter violating the 4288A listening
formats or being otherwise unacceptable.
2. Set to “1” when a semantic error occurs. Possible
errors include a command containing misspellings or
an IEEE 488.2 command that is not supported by the
4288A.
3. Set to “1” when GET (Group Execution Trigger) is
input while a program message is being received.
6 Not used Always 0
7 Power ON Set to “1” when the 4288A is powered ON.
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