... RS485 interface Modbus/RTU protocol. DIN-Rail mounting temperature controller& transmitter CH-3000 Main Specifications:PID DIN-Rail controllerMuti input singnal:TC,RTD,mA ... , R, N, T) RTD's ( pt100. cu50) Linear signals( 0/1-5V, 0-20mA, 4-20mA RS485 serial interface MODBUS/RTU ... in 21-48V dc/acDimensions 116*100*22.5mm RS485 DIN-Rail mounting temperature transmitter