The HBN Gateway installed in the machine room is connected to the HBN Visio Gateway via a two-core cable. The cable must be a twisted data cable (120 Ohm, twisted pair) e. g. for field bus, LON, CAN, etc. If necessary, free cores in the travelling cable can also be used. This should be verified individually for each application. A supplied GSM aerial is connected to the HBN Gateway. The HBN Gateway communicates with the control centre via a mobile communications Connection.