Denso BHT-7000 Manual do Utilizador descarregar pdf (Página 153)

137

Appendices

NAK

NAK

NAK

NAK

NAK

ACK

■ Phase 2 with NAK

If the sending station receives a NAK from the receiving station in response to a

transmission block containing text data m, it sends that transmission block again

immediately as shown below.

If the sending station receives an ACK before receiving a NAK 10 times in succes-

sion, it continues the subsequent message transmission.

Sending

station

Receiving

station

Data text m

Data text m

Data text m

Data text m+1

If the sending station receives a NAK 10 times in succession or it fails to send a

same transmission block, it shifts to phase 3 to terminate the message transmis-

sion abnormally. Even if the phase 3 terminates normally, the transmission results

in an abnormal end.

Sending

station

Receiving

station

To phase 3.

Occurrence

of an error

Data text m (10)

Data text m (2)

Data text m (1)

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 174 175

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