用C8051F020实现的基于TCP/IP协议的虚功率源。C8051F020外接LCD,键盘,USB接口，以太网及LXI总线。USB接口采用CH372芯片，在计算机端，CH372的配套软件提供了简洁易用的操作接口，通用Windows驱动程序提供设备级接口，通过DLL提供API应用层接口，与本地端的单片机通讯就如同读写文件。以太网接口部分采用W3100A实现传输层、网络层、数据链路层的功能，采用RTL8201BL实现物理层的功能。-With the realization C8051F020-based TCP/IP protocol of the virtual power source. C8051F020 external LCD, keyboard, USB interface, Ethernet and LXI bus. CH372 chip USB interface using the computer terminal, CH372 matching software provides a simple and easy-to-use operator interface, general-purpose Windows driver interface to provide device-level, through the DLL to provide the application layer API interface, with a local single-chip communication as read written document. Ethernet interface part of the realization of the use of W3100A transmission layer, network layer, data link layer functions, used to achieve physical layer RTL8201BL function.