Chengdu Ebyte Electronic Technology Co.,Ltd. E34-DTU (2G4H20) user manualCopyright ©2012–2019,Chengdu Ebyte Electronic Technology Co,;Ltd 32. OperationMain parts1、 First step is to mount antenna, then battery, making sure the d ial switch is on its right status. User gets on the powerby choosing either VCC/GND or power adapter.2、 Using USB-(RS232) converter or USB-RS(485) converter or other way to link computer and DTU.