In addition to the KNXnet/IP router functionality, the LINKMODULE incorporates the proven BAB facility coupling protocol. This uses Unica st transfer and communicates via the router and the Internet without problems. Specific measures as required for normal IP routers which use Multicast are not necessary. Furthermore, the LINKMODULE communicates via BAB SECURELINK (one click connection) which enables secure transfer to other BAB devices. The module is both capable of accepting an encoded connection and of establishing an encoded connection, for example to the FACILITYMASTER. The LINKMODULE can also be used as a programming interface for the ETS due to its integrated KNXnet/IP server.