Fitlet3: COM + GPIO connector pinout
From fit-PC wiki
COM + GPIO connector pinout
| Pin Number | RS232+GPIO | RS485 Half duplex +GPIO | RS485 Full Duplex +GPIO |
|---|---|---|---|
| 1 | Power In | Power In | Power In |
| 2 | GPO (output) | GPO (output) | GPO (output) |
| 3 | GPO (output) | GPO (output) | GPO (output) |
| 4 | GPI (Input) | GPI (Input) | GPI (Input) |
| 5 | GPI (Input) | GPI (Input) | GPI (Input) |
| 6 | TXD | Data- | TX- |
| 7 | RXD | RX+ | |
| 8 | CTS | RX- | |
| 9 | RTS | Data+ | TX+ |
| 10 | GND | GND | GND |
Actual connector's pinout:
