US/U 4.1 Universal Interface Installation and Operating Instructions

This document provides installation and operating instructions for the ABB i-bus EIB Universal Interface (US/U 4.1), a 4-channel flush-mounted device that can be parametrized as inputs or outputs for connecting conventional pushbuttons, potential-free contacts, or LEDs. It covers technical data, safety warnings, connection diagrams, and commissioning via ETS2 software for use in building system engineering installations.