... 4-20mA for voltage, current, active power, reactive power, frequency power factor etc., set freely.6) RS232 or RS485 communication, Modbus RTU protocol.7) With ... Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State ...