Using Serial Ports In Linux

Where Do Serial Ports Show Up In Linux?

Serial ports typically show up as files under the /dev/ folder. They are usually prefixed with tty. Common names include:

ttyUSB0  A common name for a generic USB-to-serial adapter. Most FTDI or Prolific adapters show up with this name.
ttyACM0  Ardunios show up under this name. ACM stands for “Abstract Control Model“.
ttyS0  Some UART ports on SoC devices (such as the Xilinx Zynq) show up with this name.

Changing The Permissions On A Serial Port

You can change the permissions for a serial port so you don’t have to keep using sudo by typing:

where /dev/ACM0 is the file corresponding to the serial port you wish to control.

You can permanently change the permissions by adding the user to the group dialout with the following command:

which for the current user would just be:

Note that this depends on the username and dialout group already existing (which is normally the case). This new permission will not come into effect until the user has logged out and back in again.

Posted: January 7th, 2014 at 8:54 pm
Last Updated on: February 20th, 2018 at 1:17 pm

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