说明：  本文介绍了一种基于USB总线的数据采集系统的设计方法，采用PHILIPS公司的USB接口芯片PDIUSBD12与单片机AT89C51进行通信，并和PC机通信而编制出友善的设备应用程序。
(In this paper, a design method of data acquisition system based on USB bus, using the USB interface chip PDIUSBD12 PHILIPS company communicate with single chip microcomputer AT89C51, and develop the friendly and PC communication equipment application.)