Sharp ER-A57R1 Service Manual page 35

4) Transmission sequence flow
LINE ESTABLISHED
YES
FULL DUPLEX ?
FULL DUPLEX ?
NO
SEND 1 CHARACTER
YES
YES
FULL DUPLEX ?
LINE ESTABLISHED
NO
DCD OFF ?
YES
RTS ON
DSR ON ?
YES
YES
DCD ON ?
YES
CTS ON ?
YES
TXRDY ?
YES
MORE TO
SEND ?
WAIT 100ms
RTS OFF
NO
YES
TIME OUT ?
5 sec
NO
YES
TIME OUT ?
30 sec
NO
TIME OUT ?
YES
FULL
YES
DUPLEX ?
RTS OFF
LINE ESTABLISHED
2 ™ 13
7 sec
DTR OFF
RTS OFF
TRANSMIT ERROR