The measurement and control network composed of RS485 bus mode is a common point-to-multipoint master control structure. This article refers to the address: http:// In actual engineering projects, wireless networking has to be considered when wiring is difficult. The so-called wireless 485 network is to replace the RS485 twisted pair with a wireless data terminal, and each device is equipped with a wireless 485 terminal DTD433M. So far, a wireless 485 measurement and control network with a master-slave topology has been built. The host is installed in the main control room, and the DTD433M is connected to the serial port of the computer, touch screen or PLC, thus completing the construction of the main control device. The slave device has a switch input DI and output DO, an analog input AI and an output AO, which can be connected to various field measurement and control components. There may be various transmitters such as temperature, pressure, flow, liquid level, etc., which can be uniformly represented by the input signal AI of 4~20mA. The on-site smart meter, DCS acquisition terminal, and PLC analog input unit can all be represented by the 4~20mA output signal AO. The button switch, start button, control terminal, alarm switch, etc. of the site can be uniformly represented by the switch input signal DI. On-site relays, solenoid valves, pumps, motors, inverters, soft starters, etc., can be uniformly represented by the switch output signal DO. In the system design and engineering implementation, it is only necessary to select the DTD433F analog slave or the DTD433H switch slave according to the site conditions. The wireless measurement and control system designed with this master-slave network structure is simple and rapid in engineering construction, and the network coverage ranges from several hundred meters to several kilometers. Three key devices in the system: DTD433M wireless master terminal, DTD433H wireless switch IO slave, DTD433F wireless analog terminal
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