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芬兰自动观测系统是一种集常规气象要素、云、天气现象等传感器以及相应监控和远程显示的集成自动化系统，广泛应用于各大民航机场。为实现系统内的良好通信，VAISALA公司采用了MCU111通信单元，该单元支持RS 485，RS 232及modem三种信号模式，并可根据应用需求实现不同模式间的转换，且具有工作稳定、信号传输质量高以及良好的安全性等特点。“,”The automatic weather observation system(AWOS)made in Finland is an integrated automation system,which is widely used in civil aviation airports. It integrates routine meteorological elements,cloud and weather phenomena sensors, and has the functions of corresponding monitoring and remote display. In order to achieve perfect communication inside the system, MCU111 communication unit is adopted in the system by Vaisala. The unit supports RS 485,RS 232 and modem signal pat-terns,and can implement the conversion between different patterns according to the application requirements. It also has the ad-vantages of high stability,high-quality signal transmission and high security.