开放式数控总线标准中数据链路层研究

Research on Data Link Layer in Standard of Open Numerical Control Bus

在制定开放式数控系统总线接口与通信规范标准的基础上,针对数控系统的特点,提出一种基于抽象数据链路层和实际数据链路层的双子层数据链路层结构模型,讨论抽象数据链路层的服务和协议规范以及与实际数据链路层间的封装与映射机制,并实现应用层和实际数据链路层间的服务与协议转换。

On the basis of establishing the Open Numerical Control（ONC） system bus interface and communication criterion, a new structure model for Data Link Layer（DLL） with two sublayers based on abstract DLL and real DLL is proposed by analyzing the characteristic of Numerical Control（NC） system. The services and protocol standards of abstract DLL and the encapsulating and mapping between abstract DLL and real DLL are discussed. Moreover, the conversion of services and protocols between application layer and real DLL is implemented.