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Abnormal termination of phase 2 (abort of phase 2), Normal phase 3 – Denso BHT-6000 User Manual

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Chapter 3. Communications Operations of BHT-6000

EOT

ACK

3 seconds

3 seconds

ENQ (1)

ENQ (2)

EOT

ENQ (9)

3 seconds

Abnormal termination of phase 2 (Abort of phase 2)

If the sending station receives no ACK from the receiving station after sending an
ENQ nine times in succession, it sends an EOT to the receiving station after 3
seconds from the 9th ENQ to terminate this transmission sequence abnormally.

Sending
station

Receiving
station

Phase 3: Release of Data Link

Normal phase 3

The sending station transmits an EOT to the receiving station. Upon receipt of an
ACK from the receiving station, the sending station terminates the message trans-
mission normally and releases the data link.

Sending
station

Receiving
station

Normal
termination

Abnormal
termination