CDBUS is a protocol for Asynchronous Serial Communication. When used with RS-485:
It introduces an arbitration mechanism that automatically avoids conflicts like the CAN bus.
Support dual baud rate, provide high speed communication, the baud rate is up to 50 Mbps.
Supports unicast, multicast and broadcast.
Max payload data size is 253 bytes.
Hardware packing, unpacking, verification and filtering, save your time and CPU usage.
Backward compatible with traditional RS-485 hardware (The arbitration function still works).