The ABB i-bus® KNX line coupler LK/S 4.2 is a DIN rail mounted device with a module width of 2 HP. It is used as a line/area coupler or line amplifier. As a line coupler, the LK/S connects a line with a main line, and as an area coupler, it connects a main line with an area line. It ensures galvanic isolation.
In conjunction with ETS4, the group addresses of the main groups 14...31 can be filtered.