Denso BHT-7500S, BHT-7500W user manual Phase 2 with EOT

■Phase 2 with EOT

If the sending station receives an EOT anytime during phase 2, it shifts to phase 3 to terminate the message transmission abnormally. Even if phase 3 terminates normally, the transmission results in an abnormal end.

Sending station

Receiving station

EOT

Occurrence of an error

To phase 3.

■Phase 2 with iterated ENQ transmission due to no response or invalid response

If the sending station receives no response or any invalid response from the receiving station in response to a transmission block sent, it iterates sending of an ENQ at three-second intervals up to nine times.

If the sending station receives an ACK before sending an ENQ nine times, it continues the subsequent message transmission.

Sending station

3seconds

3seconds

Data text m

ENQ

ENQ

Receiving station

ACK

Data text m+1

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