SCPI Error Responses
The SYSTem:ERRor? query requests a value from the instrument’s error
register. This register contains an integer in the range [-32768 to 327671].
The response takes the following form:
<err_number>, <err_message>
The <err_number> is the value of the instrument’s error register. The
<err_message> is a short description of the error, followed by further
information about the error.
If no error occurs, the switchbox responds with 0,"No error". If there has
been more than one error, the instrument will respond with the first one in
its error queue. Subsequent queries continue to read the error queue until it
is empty. The maximum <err_message> string length is 255 characters.
40 Understanding the Agilent E1364A Form C Switch Chapter 4