【摘要】 介绍了一种利用虚拟仪器对工控网络通信协议进行分析的方法 ,给出了测试系统的软硬件组成。它可以方便地测出RS -2 3 2和RS - 485通道的主要参数 ,通过将测试程序作相应修改 ,就能完成对各种未知协议的分析更多还原

【Abstract】 The method by using virtual instrument to analyze communication protocol of process control is introduced. The compositions of hardware and software of the test system are given. The main parameters of RS-232 and RS-485 serial port can be measured easily. Through relevant modification the analysis on various unknown protocols can be accomplished.更多还原