> For the complete documentation index, see [llms.txt](https://docs.arkelectron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.arkelectron.com/products/flight-controller/jetson-pabs/ark-jetson-pab-carrier-v3/developer/micro-usb-console.md).

# USB-C Console

Plugging a USB-C cable into the Jetson carrier puts the Jetson in USB device mode. It enumerates as one USB composite device (`0955:7020`) providing four functions:

| Function                   | Host sees                                             |
| -------------------------- | ----------------------------------------------------- |
| RNDIS + CDC-NCM networking | Two USB Ethernet interfaces; Jetson at `192.168.55.1` |
| CDC-ACM serial             | Virtual COM port with a login console                 |
| Mass storage               | `L4T-README` drive                                    |

## Serial Console

Use the `by-id` path — the `ttyACM` number changes between sessions:

```bash
ls -l /dev/serial/by-id/
usb-NVIDIA_Linux_for_Tegra_1613223640377-if02 -> ../../ttyACM1
```

```bash
screen /dev/serial/by-id/usb-NVIDIA_Linux_for_Tegra_*-if02 115200
```

Log in with your username and password (default `jetson` / `jetson`). Your user must be in the `dialout` group.

On macOS the port is `/dev/tty.usbmodem*`; on Windows it is a `COMx` port in Device Manager.

{% hint style="info" %}
This is not a boot console. The gadget (`nv-l4t-usb-device-mode.service`) and login prompt (`serial-getty@ttyGS0.service`) start under `multi-user.target`, so there is no UEFI, bootloader, or early kernel output — and no port at all if boot hangs before that point. For boot-level debugging use the physical UART console.
{% endhint %}


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