marcdahl.dk

[ TRY IT OUT HERE: https://marcdahl.dk/knx/ ] If you spend enough time working with KNX, you eventually find yourself staring at the ETS Bus Monitor, trying to decode telegrams. While ETS provides a great high-level view, it doesn't show you the raw electrical reality of the twisted-pair (TP) bus. The way KNX TP telegrams are explained to beginners To bridge this gap, I built the KNX TP Telegram Visualizer. It is a tool designed to take standard KNX inputs and generate the exact physical bitstream and timing parameters as they would appear on the wire. Here is a look under the hood at how the visualizer works and how it models the KNX TP1 standard. 1. Stripping Away cEMI: Logical vs. Physical One of the biggest hurdles in understanding KNX telegrams is the difference between cEMI (Common EMI) and raw TP formats. The ETS Bus Monitor displays telegrams in the cEMI format. This format adds a two-byte wrapper (Message Code and AddIL) at the beginning of the frame and splits the routin...