The router has a serial link which can be used to control the router and monitor error reports. It also displays the booting progress and it doesn't require networking to be set up properly.

The UART cable for Turris MOX is different than for Turris Omnia as it requires 1.8V instead of 3.3V. The pins for UART are exposed to GPIO pins. See GPIO pinout.

If using 6 pin cable as supplied in some hacker packs, connect the red Vin wire for proper operation as well.

Red wire： Vin, Black wire：GND, White wire：RXD, Green wire：TXD, Yellow wire：RTS, Blue wire：CTS

To access the serial link you first need to unscrew the top cover by removing 6 screws (3 on each side) and open the cover. The serial pins are in the right bottom corner of the board, between the right most LED and the LED control button. Connect it to you PC using a USB TTL serial adapter as shown on the photo - from the left the colors of the pins should be black (GND), yellow (RX), orange (TX). The specific cable in use in this manual is the Raspberry Pi Cable, TTL-232R-RPI.

In case of Linux (you might need root permissions) you can run this command to display the communication:

screen /dev/ttyUSB0 115200

This part of the manual only applies to Turris 1.0 & 1.1, but the steps are identical to the one for Omnia except that the hardware is a microUSB connector and it is placed on the left side of the battery. You can also display the serial link communication using the command used for Omnia.

screen /dev/ttyUSB0 115200

Settings for serial link on Windows through putty: