Denso BHT-8000 User Manual page 178

Phase 2 with a sequence of DLE NAK and IDs
If the sending station receives a sequence of DLE NAK and IDs from the receiving station in response to
a transmission block containing text data m, then it sends that transmission block again immediately as
shown below.
If the sending station receives a sequence of DLE ACK and IDs before receiving the sequence of DLE
NAK and IDs 10 times in succession, then it continues the subsequent message transmission.
If the sending station receives a sequence of DLE NAK and IDs 10 times in succession or it fails to send
a same transmission block, then it shifts to phase 3 to terminate the message transmission abnormally.
Even if the phase 3 terminates normally, the transmission results in an abnormal end.
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