Monitoring System Design, Based On The Usb Interface To The Can Bus Network

Since its development by Bosch Corporation of Germany during 1980s, CAN Bus communication network has occupied a dominant position in the area of automobile application with its high reliability and unique design after 20 years development. However, the standard protocol of CAN Bus only provides regulations on the data link layer and physical layer instead of application layer. Therefore, there is great disagreement on the application layer protocol among different automobile manufacturers , it leads to a considerably unsatisfactory supervision on the network due to difficulties involved in inspecting data within the CAN Bus communication network.In view of the aforementioned background, this paper tries to design a general testing & monitoring system for the CAN Bus Network which analyzes information collected from the nodes on the CAN Bus, as well as supervising the performance of the nodes. In the meantime, the system sends back instructions to the Bus in order to take control over the performance of the nodes. The paper has conducted work as follows to realize the application of this system:(1) Structure of the testing & monitoring system for the CAN Bus Network is outlined after profound research on the protocol of CAN Bus, with detailed elaboration on the design and development of both the hardware and software in the system.(2) This task adopts USB interface to realize the communication with computers. With the help of MC9S12DJ64, which integrates CAN controller, and CY7C68013A, which is in accordance with USB2.0 standard, develops USB-CAN adaptor, including CAN interface module, USB interface module and AD module.(3) The development process and related programming are put forward according to the particulars set by the specific programming environment, with a USB driver program specifically designed for the system.(4) A visible measurement and control platform is developed on the host computer, which tests the performance and verifies the functioning of the system with the help of PASSAT B5 CAN comfort system experiment platform.