Abstract
A net monitor system used to real-time monitor the state of the Controller Area Network (CAN) bus was designed. In the system, two while loops compose a producer consumer pattern which is the main program structure. The producer loop responds user actions and the consumer loop handles commands and data. The functions of the system such as data trace, graphics display, signal selection, and write frame are compiled in corresponding child VIs. Users can call those functions by clicking corresponding switches. While messages are transmitted in the bus, the signals that we want to monitor are real-time shown in the system. In the experiment, another CAN card is used to imitate the CAN bus that send messages to the monitoring system. The results show that the system can real-time monitor the CAN bus.
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