Fixed oxygen concentration transmitter MAQ03-AS-P5 It adopts built-in sensors, which are small in size, can be used for oxygen gas detection in different scenarios to meet customers' needs for environmental information.The output signal is RS485 Or 4-20 mA, standard Modbus-RTU Communication protocol, supports functions such as changing communication address and baud rate. RS485 Communication theoretically can communicate up to 1,200 meters, support secondary development and widely used.