High-speed Data-acquisition Syseem Based On USB1.1

Based on analyzing the development and tendency of data-acquisition system based on microcomputer, the data-acquisition system based on USBl.l, which is following the design principle-convenience, good practicability, high reliability, and low cost.In this paper, firstly, it analyse the request and characteristics of the data-acquisition system, Secondly, the scheme is put forward, then the hardware platform of the system is realized. Thirdly, the paper gives the schemes of every part and partial software. Programming the communicaton interface by taking advantage of EasyD12.dll API functions in Visual Basic 6.0 can solve the problem of serial communication of the data acqusition system with the upper personal computer, and the real-time data can be displayed.In fact, in order to enhance the reliablility and stability of the device,many measures are taken on when designing software and designing hardware.For the purpose of testing the function of dataacquisition system, an auxiliary experiment board is made. The result of testing every section of the system shows that the system canoperate in going order, and meet the designing demands.