ASR-3000 Series User Manual 
112 
External Keypad Operation 
USB Keypad 
ASR series supports external keypad, via USB connection, to 
execute operations including setting and output. Refer to the table 
below for functions of each key from external keypad. 
 
Stepping increase Voltage (or Frequency) 
Stepping decrease Voltage (or Frequency) 
This function is Not available for firmware versions 
prior to V1.20. Please update to the latest firmware 
and kernal to activate this function.Visit GWInstek 
official website to download the latest firmware and 
refer to the update procedure for details.