SAE J2602-1 2005 LIN Network for Vehicle Applications(14)

LIN Network for Vehicle ApplicationsIssued 2004-08Revised 2005-09Superseding J2602-1 AUG2004

5.7.2.2

Message ID Assignment

Each device shall be assigned 4 message ID’s based on the DNN, and therefore the NAD. If a device does not need that many messages, it shall use the messages with the lowest ID’s. If a device requires more than 4 message ID’s, it shall be assigned messages in powers of 2, i.e. 4, 8, 16, 32. The system designer must ensure that multiple devices do not use the same Message ID’s.

As a consequence of having the message ID’s associated with the DNN, after a power on reset, or reset command the protected identifiers are still marked as valid for devices with a DNN in the range $0 - $D. Devices with a DNN of $E or $F will have the protected identifiers marked as invalid as described in Section 2.1 of the LIN Diagnostic and Configuration Specification.

The following table shows the boundaries for 4, 8, or 16 messages per node. If 32 Message ID’s are required, NAD $60 must be used for this node. J2602 networks can combine nodes that use various numbers of Message ID’s.

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