1570 Keysight InfiniiVision 4000 X-Series Oscilloscopes Programmer's Guide
41 Status Reporting
Error Queue
As errors are detected, they are placed in an error queue. This 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
oscilloscope'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".
The error queue is cleared when:
• the instrument is powered up,
• the instrument receives the *CLS common command, or
• the last item is read from the error queue.
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