The data communication of the sensor was originally a simple process quantity of data analog signal output, and later the sensor interface was RS232 interface, which can realize point-to-point communication, but this mode can not realize the networking function, and the subsequent RS485 solves this problem. Sensor RS-485 communication is very convenient when used for multi-point interconnection, which can eliminate many signal lines. Sensor RS-485 communication can be networked to form a distributed system, which allows up to 32 drivers and 32 receivers to be connected in parallel. In view of the shortcomings of RS-232-C, the sensor RS-485 communication has the following characteristics: (1) The electrical characteristics of the sensor RS-485 communication: the logic “1” is represented by the voltage difference between the two wires +2V~+6V, and the logic “0” is represented by the voltage difference between the two wires – 6V~-2V. The interface signal level is lower than that of RS-232-C, so it is not easy to damage the interface circuit chip, and the level is compatible with the TTL level, which is convenient for connection with the TTL circuit. (2) The maximum transmission rate of sensor RS-485 communication data is: 10Mbps. (3) The RS-485 communication interface of the sensor adopts a combination of balanced driver and differential receiver, which has strong anti-common mode interference ability, that is, good anti-noise performance. (4) The maximum transmission distance of the RS-485 communication interface of the sensor is 4000 feet, and it can actually reach 3000 meters. (5) The RS-232-C interface allows only one transceiver to be connected on the bus, i.e., single-station capability; The sensor RS-485 communication interface allows only up to 128 transceivers to be connected on the bus, i.e. it has multi-station capability, so that users can easily set up a network of devices with a single RS-485 interface.

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