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CAN Node ID

Sundeep Kokkonda

Please answer me:

1. What is the difference between CAN Node ID & CAN Message ID? How the CAN Node ID helpful in Communication?

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  • 0 in reply to Sundeep Kokkonda

    In UDS many services are defined under ISO 15765-2 standard.
    No, they're not. UDS is defined on top of ISO TP, not the other way round.

    Also, UDS implemented over CAN Data Frame.
    No. The only implementation you've seen is over ISO-TP. That doesn't change the fact that UDS can be implemented on top of other transport protocols, too.

    It's ISO TP which, in turn, is based on CAN frames.

    When i tried to send UDS sevices, Service ID is transmitted on CAN message ID field.
    That's either pure coincidence, or a faulty implementation of UDS/ISO-TP, or you've been mislead be the very powerful interpretation features of your CAN inspection program.

Reply
  • 0 in reply to Sundeep Kokkonda

    In UDS many services are defined under ISO 15765-2 standard.
    No, they're not. UDS is defined on top of ISO TP, not the other way round.

    Also, UDS implemented over CAN Data Frame.
    No. The only implementation you've seen is over ISO-TP. That doesn't change the fact that UDS can be implemented on top of other transport protocols, too.

    It's ISO TP which, in turn, is based on CAN frames.

    When i tried to send UDS sevices, Service ID is transmitted on CAN message ID field.
    That's either pure coincidence, or a faulty implementation of UDS/ISO-TP, or you've been mislead be the very powerful interpretation features of your CAN inspection program.

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