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Common Command Descriptions
Common Command Descriptions
*IDN? (Identification Query)
The *IDN? query causes a device to send its identification information over the
bus. The Test Set responds to the *IDN? command by placing its identification
information, in ASCII format, into the Output Queue. The response data is
obtained by reading the Output Queue into a string variable of length 72. The
response data is organized into four fields separated by commas. The field
definitions are described in
table 13.
NOTE: The Serial Number format can take one of two forms:
AAXXXXXXXX
or
XXXXAXXXXX
A = alpha character
X = numeric character
The form returned will depend upon the manufacturing date of the Test Set being
queried.
Table 13 Device Identification
Field Contents Typical Response
from Test Set
Comments
1 Manufacturer Hewlett-Packard
2 Model HP 8920B Depends upon Model of Test Set
3 Serial Number US12345678 ASCII character “0”, decimal
value 48, if not available
4Firmware
Revision
Level
B.01.08 ASCII character “0”, decimal
value 48,if not available
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