CAN (Controller Area Network) communication mainly operates in two modes: Broadcast and Request/Response, which differ in how data is transmitted within a vehicle. In Broadcast mode, modules send information continuously and periodically without any prior request, allowing all nodes on the network to have immediate access to critical real-time data such as vehicle speed, engine RPM, or temperature; this type of communication is essential for systems that require constant monitoring. On the other hand, in Request/Response mode, a module or external tool requests specific information, and the corresponding module responds only when the request is received, reducing network traffic and being mainly used for diagnostic processes such as reading fault codes or specific parameters through tools like the ThinkDiag scanner; in conclusion, while Broadcast prioritizes constant data availability, Request optimizes communication by sending data only when needed.
