Programming
3
Keysight 53147A/148A/149A Operating and Programming Guide
267
Error Queue
As errors are detected, they are placed in an error queue. The error queue is a first
in, first out queue. That is, if more than one error has occurred, the first error in the
queue is read out with
:SYST:ERR?
. Subsequent responses to
:SYST:ERR?
continue until the queue is empty.
If the error queue overflows, the last error in the queue is replaced with error –350,
“Queue overflow”. Any time the queue overflows, the least recent errors remain in
the queue, and the most recent error is discarded. The length of the Instrument's
error queue is 10 (9 positions for the error messages, and 1 position for the
“Queue overflow” error). Reading an error from the head of the queue removes
that error from the queue, and opens a position at the tail of the queue for a new
error, if one is subsequently detected. When all errors have been read from the
queue, further error queries return
+0, “No error”
.
The error queue is cleared when any of the following events occur:
– Power-on.
– Receipt of a
*CLS
command.
– The last item is read from the queue.
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