文中将讨论嵌入式诊断设备的诊断原理，如何将嵌入式设备挂接到PROFIBUS总线系统和以太网中，如何工作，软件设计及硬件连接等。
Diagnostic theory of embedded device, how to interface to PROFIBUS system and Internet network, how to design the whole software and how to connect the hardware was discussed in the paper.
分析了以太网控制器的内部结构和工作原理，并用其设计了以太网接口电路。
The internal structure and principle of Ethernet controller are analyzed, and the Ethernet interface circuit is designed using this controller.
三种传输方式部分包括RS485、无线gprs、以太网传输，文中分别介绍了这三种通讯方式的工作原理和使用情况。
Three kinds of transmission including RS485, wireless GPRS, Ethernet, the paper introduced the three forms of communication working principle and use.
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