Denso BHT-100B User Manual page 181

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Abnormal termination of phase 1 (Abort of phase 1)
If the sending station receives no ACK from the receiving station after sending an
ENQ 10 times in succession, it sends an EOT to the receiving station after three
seconds from the 10th ENQ to terminate the message transmission abnormally.
The receiving station's default timeout is 30 seconds. You may modify the
timeout length on the SET PROTOCOL screen in System Mode (pp. 65 and 67)
or by using the XFILE statement (refer to the "BHT-BASIC Programmer's
Manual (BHT-100 series).")
Sending
station
ENQ(1)
3 seconds
ENQ(2)
3 seconds
ENQ(3)
ENQ(10)
3 seconds
EOT
Abnormal
termination
Receiving
station
165
Appendices