Function Voltage : Ua Current : Ia Active Power : Pa Reactive Power : Qa Apparent power : Sa Power factor : PFa Frequency : F Hz Active energy : Total Active Energy Reactive energy : Total Reactive Energy Over-limit alarm : Phase loss, frequency, voltage,current,active power,reactive power,apparent power, power factor, kWh etc. Telemetry & remote control functions : 2DI、2DO RS485 port : Modbus-RTU protocol