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CAN no connection

Question asked by Jack Peacock on Dec 13, 2013
CAN requires at least two nodes in order to work.  I'm trying to determine what the error signature is for a node that is not connected to the network so that the node can go into a timed sleep/retry mode rather than constantly report errors in the CAN SCE interrupt.  For example, in a multiple node network one node starts before all others, but since no other nodes are present it looks like the node is not connected.  But I haven't been able to identify the sequence of errors (TEC, REC, EPV, EWG, BOf flags) that are unique to a disconnected node.

Has anyone worked out how to discriminate between normal CAN bus errors and a physical disconnection?
  Jack Peacock