PSU Series Programming Manual 
46 
UART Function Check 
 
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 either RS232 or RS485 remote 
control. 
GW-INSTEK,PSU40-38,TW123456, 
T0.01.12345678 
Return the manufacturer, model, serial 
number, and firmware version in the 
above format. 
Manufacturer: GW-INSTEK 
Model: PSU40-38 
Serial number: TW123456 
Firmware version: T0.01.12345678