"Local Operating Network", a 2-wire, multi-drop communication link designed by Echelon company. The standard communication type used for IFSF. Relatively fast and robust, but uses more expensive electronics.
Local operating network (Building control bus for powerline and wired communication)
The LonTalk protocol allows field devices to communicate with each other and share information such as outside air tempeature, humidity, curent time etc. Echelon