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Connection Option (Opt8x) and Cable Wiring
Smartio C168H/PCI User’s Manual 5-7
PC COM2 port, Serial Printer,
Terminal, or any DTE Device
Opt8D
Opt8D DTE Device
DB9 Male DB25 Male
RxD 2 2 TxD
TxD 3 3 RxD
GND 5 7 GND
RTS 7 4 RTS
CTS 8 5 CTS
DTR 4 6 DTR
DSR 6 20 DSR
DCD 1 8 DCD