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Connection Option (Opt8x) and Cable Wiring
Smartio
C168H/HS User’s Manual
5-3
Type 1: To connect
Smartio
C168 Series 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