Perform the following query: 
*IDN? 
The unit will return the manufacturer, model, 
serial number and software version. 
GW INSTEK, GPP-3060,  SN: xxxxxxxxx, Vx.xx 
  Send a remote command from the PC 
  Long-press the F6 (unlock) key on the front 
panel.  
  Unplug the USB cable from the rear panel.