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本文给出了在空分控制系统中上下位机之间的通信方法，并介绍了实现这些方法的要点，最后给出了该系统中的异步中断通信实例．
In this paper, the communication between upper and lower computer in air separation control system is given, and the key points to realize these methods are introduced. Finally, an example of asynchronous interrupt communication in this system is given.