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CAN Basic Concepts
Prioritization of messages Configuration flexibility Multicast reception with time synchronization Multimaster Error detection and signaling Automatic retransmission of corrupted message Distinction between temporary errors and permanent failures of
nodes and autonomous switching off of detect node
Format of extended data frame
There are three CAN Specification versions:
• 2.0A – considers 29-bit identifier as error
• 2.0B Passive – ignores 29-bit identifier messages
• 2.0B Active – handles both 11-bit and 29-bit identifiers
- Error frame
Error detection & correction
1. Bit Monitoring. 2. Bit Stuffing. 3. Frame Check. 4. Acknowledgement Check. 5. Cyclic Redundancy Check