| Pin | Pin Name | Description | 
| 1 | CD | Carier detect. | 
| 2 | Rx | Recieve data. | 
| 3 | Ground | |
| 4 | Tx | Transmit data. | 
If you did publish instruction for  Do-It-Yourself device with this pinout,  share the link  with us.
| Pin | Pin Name | Description | 
| 1 | CD | Carier detect. | 
| 2 | Rx | Recieve data. | 
| 3 | Ground | |
| 4 | Tx | Transmit data. |