■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.
Sending station
0.5second
0.5second
0.5 second
DLE ENQ and IDs (1)
DLE ENQ and IDs (2)
DLE ENQ and IDs (59)
DLE EOT and IDs
Receiving station
Abnormal termination
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
DLE EOT and IDs
Receiving station
DLE ACK and IDs
Normal termination
