Chapter 4 Remote Interface Reference
System-Related Commands
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SYSTem:ERRor?
This command queries the power supply's error queue. When the front-panel ERROR
annunciator turns on, one or more command syntax or hardware errors have been
detected. Up to 20 errors can be stored in the error queue. See “Error Messages” in
chapter 5.
• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the
first error that was stored. When you have read all errors from the queue, the
ERROR annunciator turns off. The power supply beeps once each time an error
is generated.
• If more than 20 errors have occurred, the last error stored in the queue (the most
recent error) is replaced with -350, “Queue overflow”. No additional errors are
stored until you remove errors from the queue. If no errors have occurred when
you read the error queue, the power supply responds with +0, “No error”.
• The error queue is cleared when power has been off or after a *CLS (clear status)
command has been executed. The *RST (reset) command does not clear the
error queue.
SYSTem:VERSion?
This command queries the power supply to determine the present SCPI version. The
returned value is of a string in the form YYYY.V where the “Y’s” represent the year
of the version, and the “V” represents a version number for that year (for example,
1995.0).
*IDN?
This query command reads the power supply's identification string. The power supply
returns four fields separated by commas. The first field is the manufacturer's name,
the second field is the model number, the third field is not used (always “0”), and the
fourth field is a revision code which contains three numbers. The first number is the
firmware revision number for the main power supply processor; the second is for the
input/output processor; and the third is for the front-panel processor.
The command returns a string with the following format (be sure to dimension a string
variable with at least 40 characters):
HEWLETT-PACKARD,E3631A,0,X.X-X.X-X.X
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