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Assertion: a CAN message's identifier fixes its priority. Reason: arbitration is decided bit by bit on the identifier, the dominant level winning.

  • A.both the assertion and the reason are true and the reason explains the assertion
  • B.both the assertion and the reason are true but the reason does not explain the assertion
  • C.the assertion is true but the reason given for it is false
  • D.the assertion is false although the reason offered is a true statement in itself

Answer: A

Because a zero overrides a one during arbitration, the numerically lower identifier always wins, so allocating the identifiers is allocating the priorities. It is the reason identifier assignment is a design activity rather than an arbitrary labelling.

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