CDBUS is a simple protocol designed for serial ports and serial bus communication, commonly employed in RS-485 buses. It utilizes hardware arbitration and other mechanisms to avoid data conflicts, allowing nodes to freely transmit and receive data packets, thereby overcoming the limitations of single-master polling.

Introduces an arbitration mechanism, similar to the CAN bus, to automatically avoid conflicts.
Supports dual baud rates for high-speed communication; the maximum baud rate of the high-speed phase is up to 50 Mbps.
Supports unicast, multicast and broadcast.
The maximum user data size is 253 bytes.
Hardware packing, unpacking, verification and filtering, reducing CPU load and development effort.
Compatible with traditional RS-485 hardware (the arbitration function remains effective).

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