... RS485 interface Modbus/RTU protocol. DIN-Rail mounting temperature controller& transmitter CH-3000 Main Specifications:PID DIN-Rail controllerMuti input singnal:TC,RTD,mA ... ,Volts Thermocouples( K, J, E, S, B, R, N, T) RTD's ... in 21-48V dc/acDimensions 116*100*22.5mm RS485 DIN-Rail mounting temperature transmitter