摘要
现场总线的MAC层在很大程度上决定了网络的实时性与可靠性 ,可以说是现场总线系统的关键。介绍了MAC层的两大体系 :令牌环 /令牌总线和CSMA/CD ,并深入分析了它们各自的代表 :PROFIBUS和LON WORKS的MAC层的实现方式 。
The MAC layer largely determines the real time behavior and reliability of a fielbdus,so it is said to be the key to the fieldbus.The paper discusses two main systems of MAC layer:token ring/token bus and CSMA/CD.Moreover,we analyze the methods of realizing MAC layer,which are used by PROFIBUS and LONWORKS,representatives of the two systems.And their advantages and disadvantages and also discussed.
出处
《化工自动化及仪表》
CAS
北大核心
2001年第2期4-7,共4页
Control and Instruments in Chemical Industry
