The messages use message content based IDs rather than MCU IDs, so all CAN bus hardware can access and filter out the messages that are of interest to its associated MCU (node). The CAN bus hardware handles moving the messages through the bus with collision prevention and error correction without requiring any MCU overhead. The key features of the CAN bus is that it uses only 2 wires for bus communications and all MCUs connect to these same 2 wires. The CAN bus is in fact a good communication bus for many applications that use multiple distributed MCUs which need to interact with each other such as in factory automation or robotics.
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