摘要
分布式工业测控网ＤＭＣＮ［１］是一种带有令牌总线森林式复合拓朴结构局域网．多主站的加入改变单主站结构的复杂性．它以实时自动多主站控制保证了在一个或多个主站损坏的情况下，网络的正常运行．同时单个树之间也能共享资源，极大地提高了网络的性能．本文阐述ＤＭＣＮ网的拓朴结构和协议结构的设计思想并重点分析了ＤＭＣＮ网的ＭＡＣ和ＬＬＣ子层协议．
The distributed industrial measure and control network DMCN is a kind of forest complex topological LAN with token bus. The addition'of the multi master-stations changes the single-master-station's structure reliality. By the simulaneous and automation multi-master-stations control, it makes stires that the LAN can still run normally damaged in DMCN. At the same time,the resource can alsobe shared by every single tree, these improve the performance of the LAN greatly.The DMCN network' S the topological architecture and the idea of the protocol architecture,main analyses DMCN network's protocol of MAC and LLC sublayer are discussed and analyzed.
关键词
协议
计算机网络
实时控制
工业测控网
Protocol
Master station
Slavery station
Finite state polling
Medium access sublayer
Data link sublayer
