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78 E1442A Command Reference Chapter 3
When the queue is empty, each following SYSTem:ERRor? query
command returns 0, "No error". To clear all error numbers/messages
in the queue, execute the *CLS command.
Maximum Error Numbers/Messages in the Error Queue: The queue holds
a maximum of 30 error numbers/messages for each switchbox.
If the queue overflows, the last error number/message in the queue is
replaced by -350, "Too many errors". The least recent error
numbers/messages remain in the queue and the most recent are
discarded.
Example Reading the Error Queue
6<67(55"
Query the error queue