HP 53150A Series Programming Manual page 150

Chapter 4 Command Reference
Common Commands
*IDN?
(Identification Query)
*IDN?
COMMAND
Queries the Counter identification.
A sequence of ASCII-encoded bytes:
QUERY RESPONSE
HEWLETT PACKARD, <Model Number>, <Serial Number>, <Firmware ID>
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COMMENTS
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Shift + Menu
RELATED
FRONT-PANEL
KEYS
*IST?
(Instrument Status)
*IST?
COMMAND
Queries the current state of the parallel poll response (Instrument
Status).
<NR1>
QUERY RESPONSE
0-1
RANGE
None
RELATED
FRONT-PANEL
KEYS
4-50
This query should be the last query in a terminated program message;
if it is not the last query, an error -440 is generated.
The model number is either 53150A, 53151A, or 53152A.
The number of digits in the serial number is not fixed.
The format for the firmware ID is: H0-nnn, where nnn is a three-digit
number. This is followed by the date and time of the firmware release.
Programming Guide