+ For linux users, the currently logged in user should have read and write access the serial port over USB. On most Linux
+ distributions, this is done by adding the user to dialout group with the following command:
+
usermod -a -G dialout $USER
+ on Arch Linux this is done by adding the user to uucp group with the following command:
+
sudo usermod -a -G uucp $USER
+ Make sure you re-login to enable read and write permissions for the serial port.
+