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ABB i-bus KNX LK/S 4.3 Line Coupler Manual

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This document describes the ABB i-bus® KNX LK/S 4.3 line coupler, a modular installation device that provides data connection and galvanic isolation between two KNX lines while supporting KNX Data Secure. It details device functions including line/area coupling, line repeating, segment coupling, and secure proxy capabilities, along with ETS version compatibility and configuration requirements.

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