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Arbitration on a CAN bus is decided by

  • A.the length of the message being sent
  • B.the physical position of the node on the bus
  • C.a token circulated among the nodes
  • D.the identifier, the lowest value winning

Answer: D

Nodes transmit their identifiers simultaneously and a dominant zero overrides a recessive one, so the numerically lowest identifier wins and continues without any loss of data. Message priority is therefore fixed at design time by the identifier allocation.

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