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Connection Option (Opt8x) and Cable Wiring
Smartio C168H/PCI User’s Manual 5-3
Type 1: To connect SSmmaarrttiioo C168H/PCI to a DTE device.
PC COM2 port, Serial Printer,
Terminal, or any DTE Device
Opt8A/S
Straight-through Cable
Opt8A/S DTE Device
DB25 Female DB25 Male
RxD 2 2 TxD
TxD 3 3 RxD
CTS 4 4 RTS
RTS 5 5 CTS
DTR 6 6 DSR
DSR 20 20 DTR
GND 7 7 GND
DCD 8 8 DCD
PC COM2 port, Serial Printer,
Terminal, or any DTE Device
Opt8B/C
Null Modem Cable
Opt8B/C DTE Device
DB25 Male DB25 Male
TxD 2 2 TxD
RxD 3 3 RxD
RTS 4 4 RTS
CTS 5 5 CTS
DSR 6 6 DSR
DTR 20 20 DTR
GND 7 7 GND
DCD 8 8 DCD