Raspberry Pi / Linux Version

USB/Serial ports usually listen to one of these addresses:
 /dev/ttyACM0
 /dev/ttyACA0
 /dev/ttyUSB0

To find out the correct address you can connect to Raspberry through SSH protocol using tools such as Putty. Run the following command and take notes of the available paths.

ls /dev/tty*

Connect your device to Raspberry Pi and type the above command again. The additional path belongs to your device.


Windows Version

Enter the RAMPS COM port address.
Steps to find the correct COM port in windows:
  1. Open the "Run" dialog box by pressing and holding the Windows key, then press the R key ("Run").
  2. Type devmgmt.msc and press enter.
  3. Check out Ports section of the device manager.