Research And Development Of A CAN-bus Based Teaching Experiment System

CAN Bus is known as one of the most famous field bus because its excellent characteristics, high reliability and special design.In industrial academy, the experiment instruments of mechanotronics speciality are confronted with disusing currently. The contents of experiment teaching must be updated quickly. So it is very significant to research CAN-bus based experiment instruments.Research and development of a CAN-bus based teaching experiment system is discussed in detail in the paper. Firstly, it was introduced about CAN technique specification . The function registers about SJA1000 which woking in Pelican model are explained. Secondly, the structural model of CAN teaching experiment system was set up after summarizing some types chips information using in single-chip microcomputer, such as MCS-51, PIC, ARM. The overall project, software and hardware design were analyzed in detail. And then, the circuit diagram, software flowchart, and part of program code is given.The CAN node design process which serves AT89S51 microprocessor, SJA1000 controller and 82C250 transceiver as core was discussed particularly. To obtain CAN bus technologies straightly and completely for students, the CAN bus message from point to point, point to multi-point and receiving/sending in the way of broadcast can be realized among the communication unit. The message includes single or multi-frame, SFF, EFF, data frame and remote frame. At last the RS232-CAN transform modular is developed on the basis of comparing different communication plans between up computer and CAN bus, monitoring software is also degsined based on VB environment.