Measurement Computing Serial488/4 - Manual (Page 66)

Section 3 Command Descriptions
3.27
Version Query V?
The Version Query command returns the Serial488/4 firmw are revision
number.
V?
Return Serial488/4 firmware revision number.
Example 1: Get Serial488/4 firmware revision using dual primary addressing mode.
PRINT#1,"OUTPUT08;V?" ask for version information
PRINT#1,"ENTER08"
read the response
INPUT#2,A$
PRINT A$
display shows 1.3 (or higher)