Denso BHT-7500S User Manual page 212

Abnormal termination of phase 2 (Abort of phase 2)
If the sending station receives no sequence of DLE ACK and IDs from the receiving
station after sending a sequence of DLE ENQ and IDs 59 times in succession, it
sends a sequence of DLE EOT and IDs to the receiving station after 0.5 second from
the 59th sequence of DLE ENQ and IDs and then aborts this transmission abnor-
mally.
Phase 3: Release of Data Link
Normal phase 3
The sending station transmits a sequence of DLE EOT and IDs to the receiving
station. Upon receipt of a sequence of DLE ACK and IDs from the receiving station,
the sending station terminates the message transmission normally and releases
the data link.
Sending
station
Normal
termination
Sending
station
0.5 second
DLE ENQ and IDs (1)
0.5 second
DLE ENQ and IDs (2)
DLE ENQ and IDs (59)
0.5 second
DLE EOT and IDs
Abnormal
termination
DLE EOT and IDs
DLE ACK and IDs
192
Receiving
station
Receiving
station