Line/area coupler, KNX Secure. For connecting two KNX bus lines, whereby the signal transmission is galvanically isolated. The KNX Secure line and area coupler serves as a data flow filter for cross-bus telegrams and can be configured in conjunction with the ETS with group addresses from 0 to 31. It also serves as a signal amplifier. If the max. line load is exceeded, an additional line coupler including power supply must be used. Possibility of remote firmware updates via ETS app.