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Appendix A Error Messages
Error Queue
Operating and Programming Guide A-3
Error Queue
As errors are detected, they are placed in an error queue. This queue is
first in, first out. That is, if there has been more than one error, the
first one in the queue is read out with
:SYST:ERR?
. Subsequent
responses 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 Receiver’s error queue is 30 (29 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 occur:
• Upon power-on.
• Upon receipt of a *CLS command.
• Upon reading the last item from the queue.