HS/S 4.2.1 Brightness Sensor Interface Manual

This document describes the ABB i-bus® KNX Brightness Sensor Interface HS/S 4.2.1, which measures daylight brightness and can also function as a twilight sensor. It details the device's wide sensor range, compatibility with up to three Outside Brightness Sensors LFO/A 1.1, and its extensive evaluation functions including threshold and logic channels.