A KNX / EnOcean gateway (Theben EnOcean Gateway, Weinzierl EnOcean Module, etc.) allows EnOcean devices to be integrated into a KNX project: each EnOcean sender (button or sensor) is mapped to a KNX Group Address.

The gateway sits on the KNX twisted-pair bus and listens on the 868 MHz EnOcean band. Each EnOcean Device ID is taught into the gateway and bound to one or more KNX Group Addresses through ETS, so an incoming RPS rocker telegram is translated into the corresponding 1.001 switching DPT on the bus. The typical use case is retrofit: adding sensors and push-buttons to an existing KNX installation without pulling fresh cable. Price points are roughly 200 to 500 EUR per gateway, supporting 20 to 60 devices depending on the vendor (Theben TR EnOcean, Weinzierl, ABB).

When you size a gateway, count Group Object slots rather than Device IDs; a single rocker switch typically consumes several Group Objects (top, bottom, long-press), and the slot count is often the real bottleneck.