4
Remote Operations Using the IEEE 488 Interface
Triggering and Reading Operations
EXQ?
Recalls the last error from the queue of execution errors. An execution error occurs when
a command cannot be complied with.
Read the Queue until Empty. It is good practice to read the queue until empty on each
occurrence of execution error, to prevent unrelated history of errors being retained.
Response
(Nr1) The value returned is a integer value indicating the fault.
The execution error queue operates as a Last In - First Out stack, and individual entries
are read destructively. If there are no entries in the queue, then use of this command
produces a result of zero. For details of the number/fault relationship refer to
Appendix A.
Power On and Reset Conditions
The queue is cleared.
Triggering and Reading Operations
Trigger Source Selector
TRG_SRCE INT
EXT
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Trigger Source Selector
INT
Selects the internal interval counter as the source, and disables external trigger sources.
EXT
Disables internal triggers and enables three external trigger sources:
• Rear panel trigger socket.
• Controller-generated GET or *TRG commands.
• Front panel
Sample key. This will have been disabled when the instrument was
transferred from Local to Remote Control.
Selections are mutually exclusive.
Note
Internal triggers or uncontrolled rear panel triggers can produce
unexpected results, due to the time required for the A-D conversion, and the
A-D triggers being unsynchronized with the IEEE 488 bus operations. Such
triggers should be avoided unless they form an essential ingredient of the
required measurement.
Power On and Reset Conditions
INT.
4-33
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