给出通信协议剖析的一般方法和步骤,介绍GE爱德华EST3火灾报警系统的组成.对该系统串行通信协议的结构以及数据链路层和应用层的帧格式进行剖析.举例说明其应用层的基本分组格式,包括命令服务帧格式、报告服务帧格式和日期/时间通告服务帧格式.%The paper depicts the method and steps for dissection of communication protocol and introduces the composition of GE Edwards EST3 fire alarm system. It analyzes the structure of the communication protocol of this system and the flame format of data link layer and application layer. Some basic packet formats such as the formats of command service, report service and date/time announce service are illustrate.
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