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Connecting via Serial Console

The Comet-M has an inbuilt Serial Console that can be connected using a UART cable. Note, this also can be a Hail Mary solution if SSH or any other form of connectivity fails.

What you'll need​

Connecting the USB to UART Cable​

  • The Debug UART pin mapping for the Comet-M is shown below.
$ sudo apt add update
  • Connect the male header pins of the UART cable to the Debug UART pins on the Comet-M
  • Connect the USB end of the cable to your machine.

Connect to Serial Console on Linux​

  1. Open the Terminal on your Linux machine.
  2. Type dmesg | grep tty to list the connected devices. Your UART bridge will appear as something like /dev/ttyUSB0.
$ dmesg | grep tty
[    0.000000] console [tty0] enabled
[  542.711750] usb 1-4: FTDI USB Serial Device converter now attached to ttyUSB0
  1. Connect to your device using the screen command, followed by the device path and the baud rate, which is typically 115200.
$ sudo screen /dev/ttyUSB0 115200
  1. If everything is done correctly, you should now be connected to the device via the UART cable.

Connect to Serial Console on MacOS​

  1. Open the Terminal on your Mac.
  2. Type ls /dev/cu.* to list the connected devices.
$ ls /dev/cu.*
/dev/cu.Bluetooth-Incoming-Port /dev/cu.usbserial-XXXX
  1. Identify the device that represents your UART bridge. It should look something like /dev/cu.usbserial-XXXX.
  2. Connect to the device using the screen command followed by the device path and the baud rate i.e. 115200.
$ screen /dev/cu.usbserial-XXXX 115200
  1. If everything is done correctly, you should now be connected to the device via the UART cable.

Connect to Serial Console on Windows​

You will need the PuTTY application to connect to Serial Console on Windows. Follow this tutorial on how to use PuTTY.