ABB EIB / KNX Area/line coupler MRDC (2 DIN)
It is used as a line or area coupler or as a repeater. As a line coupler, the LK/S connects a line with a main line, as an area coupler it connects a main line with an area line. It provides electrical isolation in this way.
As a line/area coupler, the LK/S connects the data flow of two lines but isolates them electrically. The coupler can route physically addressed, group addressed as well as broadcast telegrams. In order to route a physically addressed telegram, the LK/S compares the target address with its own physical address. As a line coupler, the LK/S connects a line with a main line. As an area coupler, the LK/S connects a main line with an area line. Each line requires its own power supply.
As a repeater, the LK/S connects the data flow of two line segments but isolates them electrically. Behind a line coupler (in one line), up to three repeaters can be connected in parallel in a line. This is how up to four line segments form an entire line. A line can thus be expanded from 64 possible devices (1 line) up to 256 devices (4 line segments). Every line segment must be provided with power by its own KNX power supply.