Connection Option (Opt8x) and Cable Wiring
Type 1: To connect C168P to a DTE device.
Straight-through Cable
Opt8A/S
PC COM2 port, Serial Printer, Terminal, or any DTE Device
Opt8A/S
DB25 Female
RxD | 2 |
| 2 |
| |||
TxD | 3 | 3 | |
CTS | 4 |
| 4 |
| |||
RTS | 5 |
| 5 |
| |||
DTR | 6 |
| 6 |
| |||
DSR | 20 | 20 | |
GND | 7 |
| 7 |
| |||
DCD | 8 |
| 8 |
| |||
Null Modem Cable Opt8B/C 
DTE Device
DB25 Male
TxD
RxD
RTS
CTS
DSR
DTR
GND
DCD
PC COM2 port, Serial Printer, Terminal, or any DTE Device
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 |
| ||||
C168P User’s Manual
