... 3-phase current, voltage, active power, reactive power, kwh, harmonic, extreme value etc. With RS485 interface. AccuracyEnergy measuring: active energy ... VAFunction modulesEnergy pulsePassive optocoupler collector outputCommunication interfaceOne-way RS485 communication interface; MODUBS-RTU communication protocolCommunication baud rate ... 91X91); 2: 108X108 (or 111X111) mm. Multifunction Power Meter