> For the complete documentation index, see [llms.txt](https://wiki.cbunmanned.com/wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.cbunmanned.com/wiki/products-eol/cbu-cm405-fc-eol/female-header-f405.md).

# Female Header F405

Top Side:

<figure><img src="/files/DiX5QlL1kQ9fiWR1B9wO" alt=""><figcaption></figcaption></figure>

Bottom Side&#x20;

<figure><img src="/files/aU6Ignpq0QUx4ymt5Rd8" alt=""><figcaption></figcaption></figure>

| Main Pin Header (viewed from mating side) |             |
| ----------------------------------------- | ----------- |
| RC Jumper                                 | RC Jumper   |
| SBus In                                   | Ground      |
| Inverted SBus Out                         | 5v          |
| PWM 5                                     | Serial Rx 5 |
| PWM 6                                     | Serial Tx 5 |
| Ground                                    | Serial Rx 4 |
| 5v                                        | Serial Tx 4 |
| Ground                                    | Serial Rx 3 |
| 5v                                        | Serial Tx 3 |
| Pi CM4 Tx                                 | Serial Rx 1 |
| Pi CM4 Rx                                 | Serial Tx 1 |
| Ground                                    | Serial Rx 2 |
| 5v                                        | Serial Tx 2 |
| Ground                                    | I2C SCL     |
| 3v3                                       | I2C SDA     |