In the message-based CAN protocol, what two purposes does the message identifier serve?
Answer
Dictates message priority and describes message content
The identifier within a CAN message is central to how the protocol functions without centralized addressing. It serves a dual function. First, it inherently defines the priority level of that specific message, which is used by the arbitration process to control bus access. Second, the identifier functions as a label describing the actual data payload being transmitted. Nodes on the network read this identifier to quickly determine whether the message contents are relevant to their operation, allowing them to filter necessary information from the continuous stream of broadcast data.
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