Usb Bus Technology In The Virtual Instrument

The technology of USB is one new standard of industrial bus in PC system. At the present time, USB port not only has been the standard port of the main board of PC, but also trends to substitute the other bus interface such as serial interface, parallel interface and so on.USB is abroadly applied in all kinds of peripheral equipment of PC and it is cheap, high speed, low power and support Plug&Play. It's convenient in use and maintenance.With the development of computer technology, the power of personal PC is becoming greater and greater and the technology of virtual instrument which is being develop at very fast speed has great foregroud.It will become one new trend to apply the technology of USB in cheap measure instrument.The paper is organized as follows. Section 1 discusses the developmental process of the technology of USB and virtual instrument and put forward one elementary design scheme of the system. The technology of USB is presented detailedly in Section 2, while Section 3 expounds the holistic design scheme of system hardware and the thought of programming. Section 4 discusses the holistic design scheme of system software and programme interface. The structure of developing system and effect picture of sampling are presented in Sections. Some suggestions to improve the system is also presented in Section 5.The paper discusses the application of the technology of USB in the design of software and hardware of virtual instrument, and bring forward one feasible solution.