User`s manual

88
■ 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 the phase 3 terminates
normally, the transmission results in an abnormal end.
3 seconds
3 seconds
ENQ
ENQ
ACK
Sending
station
Receiving
station
Data text m
Data text m+1
EOT
Sending
station
Receiving
station
To phase 3.
Occurrence of
an error
■ Phase 2 with 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.