Research On Virtual Instrument Based On USB 2.0 Interface

6This thesis involves development of Virtual Instruments based on USB 2.0 interface. USB interface has found wide applications in various peripheral equipment of PC. USB 2.0 specification issued in 2000 can provide a speed of 480 Mbps, which enables applications of high speed equipment. With the development of computer technology, Virtual Instrument (VI) based on PC computer has made great progress. Therefore, Combination of USB 2.0 interface and VI should be a very promising idea. The author has got good results in such research, and the main contributions are as follows.1) A scheme to realize Virtual Instrument based on a PC computer and USB interface circuit board is proposed, including design and implementation of its hardware and software.2) A high speed data acquisition circuit board with USB 2.0 interface and EZ-USB FX2 as equipment controller is developed, whose maximum sample rate can reach 60 MHz and whose rate of transferring sample data to the PC computer can reach 240Mbps.3) The author succeeded in developing an initial prototype of Virtual Instrument, including programming and debugging of USB 2.0 microcontroller Firmware, dynamic-link library (DLL), and LabVIEW programs, as well testing the whole system.