Research Of Application Of Data Acquisition And Transmission System Based On USB2.0 Technology

Data acquisition and transmission technology are usually applied to many situations , such as scientific research and industry. Due to the speed and difficulty of installment, the further development and application of the data acquisition instruments were confined to the traditional communication ways. As a good solution to the problems, the USB(Universal Serial Bus) technology is widely used because of the attributes of hot-plug-in, plus-and-play, easy to expand, engrossing less system resourse. The USB2.0 has been paid much attention depending on the theory transfer rate of 480Mbps.The data acquisition and transmission system was developed with USB2.0 technology in this paper, based on deeply analyzing of USB2.0 protocol, which built up the hardware and sofeware platform for data acquisition and transmission with USB2.0 technology. As for application, the system was use in multicenter dynamic ECG recorder and contaminative insulators on-line detecting system, and the bulk and interrupt transmission were carried out in these system respectively. In detail, the main achievements of the research are shown below:①The hardware circuit of system was designed, which based on ISP1581 USB2.0 interface chip of philips corporation. The bus work mode and data accessing mode were mainly considered in the process of design.②The software platform of system was built up, which made up of fireware, device driver and application program. The fireware was complied with language C, whose primary functions were USB bus enumeration, A/D conversion and information communication between device and host computer. The device driver was developed with the saddlebag driverworks of Numega company. The application program was developed to control device, read-write data, display waveform and read-back record.③The multicenter dynamic ECG recorder based on USB2.0 technology was designed, which mainly completed acquisition of ECG analog signals, switch of power supply mode, data management and data transmission with USB bulk transfer mode.④The contaminative insulators on-line detecting system based on USB2.0 and SMS technology was designed, which was a practical application of USB2.0 data acquisition and transmission system with its interrupt transfer type. The develop of LP-1 insulators on-line detecter and the establishing of data transfer channel were the most important part in the whole system. The format of detecting data was set down for SMS transmission in this system.The paper combine USB2.0 study with its practical application, in order to solve interface problem between device and host computer, and complete data acquisition and information communication. Based on the need of subject, USB2.0 technologty is applied to practical data acquisition system, which made convenient connect between acquisition device and host computer, and provides USB advantage to acquisition device. The successful application of USB2.0 technology provides a good foundation for further study and application of USB.