1. Basic function page (welcome page/connection matching/technical support) Welcome page: Once you enter the smart meter app page, you will automatically jump to the next page after the app is launched. Connection pairing: APP guide the user to open the search for the Bluetooth device, and the search results are displayed in a list. Technical support: Service users at any time, put customer service functions in the system interface to facilitate user assistance. 2. Communication parameter settings Different connection modes contain RS-485 or Ethernet can be set for different environments. Such as the baud rate, the same bit, the data bit, the stop bit, the IP address, the subnet mask, and the gateway address, Modbus TCP connection port, and other different parameters. 3. Phase line parameter setting Different parameter settings can be made for four wiring types such as 1P2W, 1P3W, 3P3W, and 3P4W. Each setting item needs to be adjusted according to the physical wiring system and C.T. serial connection mode, and should be paid attention to the correctness of the serial connection mode of each interface. 4. C.T. parameter setting The APP provide 333mV and 5A equalizer parameter settings and users can confirm whether the current matches the set value. 5. Other functions If necessary, users can also reset the hardware directly (all parameters are restored to factory settings).