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Connection Option (Opt8x) and Cable Wiring
Smartio C168H/PCI User’s Manual 5-5
Modem,
or any DCE Device
Opt8B/C
Straight-through Cable
Opt8B/C DCE Device
DB25 Male DB25 Female
TxD 2 2 RxD
RxD 3 3 TxD
RTS 4 4 CTS
CTS 5 5 RTS
DSR 6 6 DTR
DTR 20 20 DSR
GND 7 7 GND
DCD 8 8 DCD
Modem
or any DCE Device
Opt8D
Opt8D DCE Device
DB9 Male DB25 Female
RxD 2 2 RxD
TxD 3 3 TxD
CTS 8 4 CTS
RTS 7 5 RTS
DTR 4 6 DTR
DSR 6 20 DSR
GND 5 7 GND
DCD 1 8 DCD