Open Systems Interconnect (OSI) Model. Controller Area Network Standard. Defines Physical Layer (L1) Defines Data Link Layer (L2) Defines how to Transport (L4) small (8 bytes) datagrams No flow control (L3 and L4) No sequencing and fragmentation (L3)
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If A transmits recessive (1) and sees dominant (0) from B, A knows collision occurred and stops transmitting (will retry 6 clock cycles after end of dominant message)
Phase Segment 1
Phase Segment 2
For Data Request RTR = 1 (recessive) and DLC = 0 (data field empty)
3 byte headers contain destination and source addresses