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。
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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