You will probably need to grant openhab some permissions.
To give a specific group access to a USB device you have to add a rule to udev in /etc/udev/rules.d/. Add a file called CHOOSEANAME.rules that contains something like this line:
SUBSYSTEM=="usb",ATTRS{idVendor}=="abcd",ATTRS{idProduct}=="1234",MODE="0660",GROUP="mygroup",SYMLINK+="mydevice%n"
Search the web for a detailed tutorial on udev rules and maybe symlinks.
The not preferable way is granting sudo.