... 2-3 alarm output,act as under-voltage/lacking phase/over current/breaking line protection.4) ... Communication: RS232/RS485 interface,MODBUS RTU procotol.5) Dimemsions: DH4:48*48*80 DH8: 96 ... TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer ...