Although open system is a popular word, but as for most users, its realization seems to be inoperable.

虽然开放系统是一个流行的名词，但是对于一般用户，它却是一个在实际工作中“无法操作”的事物。

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This paper presents a serial communication protocol structure based on open system interconnection reference model. The function and realization method of every layer is discussed.

文章提出一种基于开放系统互联模型的串行通信协议结构，讨论了各层协议的功能和实现方法。

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Lastly, the paper researches some key technologies about the realization of open CNC system.

最后，本文研究了实现开放式CNC系统的一些关键技术。

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