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4-22
Programming
Monitoring the Instrument
The error queue is first in, first out. 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 30
(29 positions for the error messages, and 1 position for the
“Queue overflow”
message).
The error queue is read with the SYSTEM:ERROR? query. Executing this
query reads and removes the oldest error from the head of the queue, which
opens a position at the tail of the queue for a new error. When all the errors
have been read from the queue, subsequent error queries return 0, “No error.”
For more information on reading the error queue, refer to “ERRor” on page
5-79. For a list of errors messages, refer to “Error Messages” on page 8-9.