User`s manual

:VERSion?
SYSTem:VERSion? returns the SCPI version number to which the
Agilent E1445A complies: “1991.0”.
Comment Executable when Initiated: Yes
*RST Condition: None
Example Querying the SCPI Revision
SYST:VERS? Queries SCPI revision.
SYSTem
390 Command Reference Chapter 8