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The bus-off state of a CAN controller is entered when

  • A.the bus has been idle for longer than a timeout
  • B.two nodes are given the same identifier
  • C.the termination resistors are omitted
  • D.its transmit error counter exceeds 255

Answer: D

The counters rise on errors and fall on successes, so a node that is persistently faulty removes itself and stops disrupting the bus. Recovery requires software intervention, which is why a driver must handle the condition rather than ignore it.

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