串口转以太网目前可以采用串口转以太网模块来实现，变得非常简单易用，但是在该技术中出现的一些新问题、使用误区需要引起注意。串口转以太网并不是简单传输媒介的变化，而是串口到TCP/IP的协议转化。其中关系到的关键技术包括：TCP/IP的工作模式问题、串口分帧技术、9位技术。这里详细分析这些串口转网口的技术。-Serial to Ethernet can currently be used serial to Ethernet module to achieve, very easy to use, but the technology of the emergence of some new problems, the use of misunderstanding needs attention. Serial to Ethernet is not a simple transmission media change, but the serial to TCP/IP protocol conversion. Which is related to the following key technologies: TCP/IP working mode, serial frame technology, the 9 technology. Here a detailed analysis of the serial port to network technology.