symlinks

Use symlinks if you use more than one USB port. If you have more than one USB device (e.g. a Zwave dongle and an RFXCOM dongle, the USB name will change every time you reboot. To prevent this, create or add to existing file (/etc/udev/rules.d/50-usb-serial.rules) a rule like the following:

SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{product}=="RFXrec433", SYMLINK+="USBrfxcom", GROUP="dialout", MODE="0666" 
SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60", SYMLINK+="USBzwave", GROUP="dialout", MODE="0666"
SUBSYSTEM=="tty", ATTRS{idVendor}=="0658", ATTRS{idProduct}=="0200", SYMLINK+="USBzwave", GROUP="dialout", MODE="0666"

To get IdVendor, product, and IdProduct, you need to run (for USB0, USB1, ACM0 etc) sudo udevadm info --attribute-walk --path=/sys/bus/usb-serial/devices/ttyUSB0. There you can find IdVendor, product, and IdProduct. Replace these IDs in the rule and save the file. Now your stick can be referenced in OpenHab configuration as /dev/USBzwave. You will also need to add the property to the Java command line by adding the following (device names delimited by : ) to the file /etc/init.d/openhab in the 'JAVA_ARGS' section with your device names substituted:

-Dgnu.io.rxtx.SerialPorts=/dev/USBrfxcom:/dev/USBzwave

Note: If you are using the apt-get installation method, you should add the previous line to the 'JAVA_ARGS' section of the '/etc/default/openhab' file. Note: On Linux; the extra Java command-line property is not required if you choose a symlink name that matches a standard Linux comm port prefix and ends with a combination of numerics + non-letters. E.g. "ttyUSB-9999".