The segment code LCD display can measure a total of 28 electrical parameters such as voltage/current/active power/reactive power/frequency]/power factor, and has active/reactive power measurement function. It also has a pulse output port RS485 communication interface (using Modbus RTU communication protocol and DL/645 protocol) with 4 switch inputs and 2 alarm outputs. The input/output is fully isolated and has remote signaling and remote control functions. There is 1 channel for measuring total harmonics for 8 time periods and 4 rate statistics functions