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指出数控机床与计算机组成通信系统的要领和通信时必须遵循的控制规程，以及数据链路控制规程应具备的功能和使用的种类。
It points out the essentials of the communication system and the control rules which must be followed in the communication between NC machine tools and computer as well as the types of functions and uses that data link control procedures should have.