Micro USB Console

Plugging a Micro USB cable into the Jetson carrier disconnects the flight controller from the Jetson's USB and 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

After disconnecting the Micro USB cable, reboot the Jetson to reconnect the flight controller USB.

Serial Console

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

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

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.

This is not a boot console. The gadget (nv-l4t-usb-device-mode.service) and login prompt ([e-mail]) 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.