for data/flash cable only
| Pin | Signal | Description |
| 14 | Vbus | connect to PC USB pin 1 in cable |
| 18 | USB D- | connect to PC USB pin 2 in cable |
| 17 | USB D+ | connect PC USB pin 3 in cable |
| 8 | GND | connect PC USB pin 4 in cable |
| Pin | Signal | Description |
| 5 | Tx (serial) | |
| 6 | Rx (serial) | |
| 17 | GND |
