Only this three signal wires are needed in the computer cable.
Camera cable Pin | Signal | Computer DE-9 cable pin |
1 | Receive data (RxD) | Connect to DB9 pin 2 |
2 | Signal ground (Gnd) | Connect to DB9 pin 5 |
3 | Transmit data (TxD) | Connect to DB9 pin 3 |
You may short together pin 4 (DTR) to pin 6 (DSR) and pin 7 (RTS) to pin 8 (CTS), if needed.