Invoke a terminal application such as Realterm. 
To check the COM port No., see the Device 
Manager in the PC. For WinXP; Control panel → 
System → Hardware tab. 
Run this query command via the terminal 
application after the instrument has been 
configured for USB remote control (page 158). 
*idn? 
This should return the Manufacturer, Model 
number, Serial number, and Firmware version in 
the following format. 
GW-INSTEK,PSU40-38,TW123456,T0.01.12345678 
 Manufacturer: GW-INSTEK 
Model number : PSU40-38 
Serial number :  TW123456 
Firmware version : T0.01.12345678 
For further details, please see the programming 
manual, available on the GW Instek web site @ 
www.gwinstek.com.