COM port to TTL (5V/3.3V) programming cable for CC18, MS121, HD8 and other controllers with a 4-pin programming connector. Can also be used as a TTL to RS232 adapter on newer controllers such as the DIN Family for custom communications.
| DB9 Female |
| Pin | Description | Direction |
| 2 | Transmit Data | OUT |
| 3 | Receive Data | IN |
| 5 | Ground |