Based on token ring transmit protocol ANSI/ATA878.1 and the encoding principle of ARCNET data flow,this article gives a method to directly capture and decode the information frame and its engineering application.

• 基于令牌传输协议ANSI/ATA878.；1及ARCNET网络数据报文的编码原则，提出了直接截获传输介质信号流，解码复现信息帧的解码原理及其在实际工程项目中的具体实现。