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KNX Bus Monitor

Watch live decoded telegrams, filter, page through history and chart any address.

elausys · 23 July 2026
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Bus monitor

The Bus monitor tab shows decoded KNX telegrams from the bus — your first diagnostic stop when a device does not react.

What you need: the history database service enabled (see “History & Data Logging”). Without it the tab shows a notice instead of data.

Each telegram row shows the source address, destination address, data type (DPT), raw data, and — where the address is known — the group address name, the bound device, the object and its room.

  • Filter by time: set Start Date/Time and End Date/Time to inspect a period (last night's heating cycle, yesterday's alarm event).
  • Search: free-text search across addresses and names — combined with the jump from a group address (see “KNX Integration”) this isolates one address's traffic.
  • Paging: results are paged with a record count and First / Previous / Next / Last controls.
  • Chart: click Show chart on a numeric address to plot its values over the selected period.
Bus monitor tab.

Frequently Asked Questions

What must be enabled to use the bus monitor?

The history database service. Without it, the tab shows a notice instead of data.

How do I inspect traffic for one group address?

Search for the address or name, or use Watch on the bus monitor from that group address’s details.

Can I chart a KNX value over a past period?

Yes. Set the start and end times, then click Show chart on a numeric address.

Keep exploring

Find the other guides for this product in the documentation.

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