In view of the inconsistent communication protocols between the upper computer PLC and the field equipment of the airport terminal monitoring system, this paper takes the UC-7408 embedded controller of MOXA Company to realize the conversion of two communication protocols between PLC and Shenkou equipment as an example to explain how to use embedded controller to realize communication protocol conversion, and proposes a method of using C language to write a protocol conversion program to realize the communication between the lower computer and the upper computer monitoring system. It introduces in detail the principle of protocol conversion, the hardware composition of the communication system and the software implementation method. This method has passed the test and has the advantages of reliable communication, high extraction rate and strong real-time performance. Keywords: protocol, thread, protocol conversion, field equipment, embedded
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