HP 8920A Programmer's Manual page 212

Common Command Descriptions
Table 14
NOTE:
212
Device Identification
Field Contents
1 Manufacturer
2 Model
3 Serial Number
4 Firmware
Revision
Level
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.
Typical Response
from Test Set
Hewlett-Packard
HP 8920A
US12345678
B.01.08
Comments
Depends upon Model of Test Set
ASCII character "0", decimal
value 48, if not available
ASCII character "0", decimal
value 48,if not available