REMOTE OPERATION STATUS COMMANDS
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Queue flag details
The <mav> status bit is set when one or more bytes are available to be read from the output queue.
The <erb> status bit is set when one or more errors are present in the error queue. The ERROR?
query will place an NR1 response message in the output queue, representing the error at the head
of the queue. If the queue is empty, this message is ‘0’.
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