| The environmental monitoring technology is an important part in industrial production of national economy and people's concerns. There are problems in traditional sensor monitor network that unified structure, complex communication lines , huge interference amang analog signals and other major issues, especially in the complex electromagnetic environment, the data transmission reliability is prone to be affected badly.In view of this issue, profiting from the industrial application matureexperience of CAN bus technique and the deep research of magnetic field monitor technology, the hardware and software of modular digital monitoring system is initially studied based on the CAN bus technique to monitor the vector magnetic field. The following several aspects of work are mainly studied:1st, the new technology of intelligent sensor monitoring network platform is studied. It is discussed that the IPv6 network and the sensor agent server (SAS) applies in the monitoring system's network construction, and the framework of monitor network nodes is designed based upon CAN bus standards.2nd, with MSP430F low-power single-chip(MCU) and magnetic integration chip HMC1002, the dual-axis vector magnetic-detection module is designed and realizated; the CAN node connection is also completed with MCP2510 and the PCA82C250 integration chip.3rd, based on DeviceNet framework protocal, the magnetic monitor node module and the CAN upper application protocol are studied. The reliable CAN data communication protocol and priority protocal for promotion is constituted to guarantee the data communication real-time and reliable.Finally, constrcut communication experiment between CAN net nodes and the upper PC to synthesis validate the feasibility and the accuracy of data transmission form and the communication protocol. The experiments provided the reliable basis of CAN technology application in sensor network monitor system. |
