User`s manual

Relay Multiplexer Command Reference 67
:ERRor?
SYSTem:ERRor? returns the error numbers and corresponding error messages in
the error queue of a switchbox. See Appendix C for a listing of the switchbox error
numbers and messages.
Comments • Error Numbers/Messages in the Error Queue: Errors generated by a
switchbox store an error number and corresponding error message in the error
queue. The error number is always a negative number. Each error message can
be up to 255 characters long.
• Clearing the Error Queue: An error number/message is removed from the
queue each time the
SYSTem:ERRor? command is sent. The errors are cleared
first-in, first-out. When the queue is empty, each following
SYSTem:ERRor?
command returns
0, "No error". To clear all error numbers/messages in the
queue, execute
*CLS.
• 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 oldest error numbers/messages remain in the queue
and the most recent are lost.
Example Reading the Error Queue
SYST:ERR?
Query the error queue.