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Working principle of CANbus network
Data frame
The basic unit of CAN bus communication is data frame. Data frame includes identifier, data length code (DLC), data field and CRC check field. The identifier is used to mark the priority of data, and the data field contains the actual transmission data.
Frame format
CAN data frame is divided into standard frame and extended frame. Standard frame uses 11-bit identifier, while extended frame uses 29-bit identifier to support larger identifier space. The data frame also includes control field, data part, CRC check and ACK bit.
Error handling
CANbus adopts a variety of error detection mechanisms, including bit error, fill error, checksum error, etc. When an error is found, the node will issue an error flag and retransmit the data to ensure the reliability of the data.
Advantages of CANbus network
High reliability
CANbus adopts a variety of error detection and error handling mechanisms to ensure high reliability of data transmission. This makes it widely used in automotive and industrial control systems.
Efficiency
CANbus's multi-host structure and priority mechanism make data transmission very efficient. On the same bus, high-priority data can be transmitted first, thereby reducing delays.
Strong adaptability
CANbus can adapt to various application scenarios, not only limited to the automotive field, but also widely used in industrial automation, medical equipment, agricultural machinery and other fields.
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