SK Master/slave cabel, for SK BUS system, Master/slave cable for SK-BUS system, 3 m shielded interface cable Operating instructions for programming the cooling units, 85444290, 1 pc(s), 0.331 lbs, 4028177325494, The SK BUS system allows several cooling units and air/water heat exchangers with e-Comfort controller to communicate with one another. The master/slave assembly ensures an optimal operating result for complex bayed enclosure systems.