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knx ip interface problems - Andrea Becagli - 13.04.2026

Hi,
I have been trying to download a few KNX devices using a LogicMachine (LM) as an IP interface, but it fails every time. The weird thing is that when I replaced the LM with an Apricum IP Interface, I had absolutely no problems downloading.
Here is what I have tried so far to troubleshoot:
  • Firmware rollback: I thought it could be an issue with the new firmware (20251204), so I tried reflashing the LM with an older firmware version (20211215), but the problem persists.
  • Network change: I tried using a completely different network setup, but nothing changed.
I have used LMs as IP interfaces in hundreds of installations without any issues, so this behavior is very unusual.
For further context, I am using ETS 6.4.1. I have attached the downloading telegrams as an export from ETS Diagnostics to this post to help with troubleshooting, some telegrams are flagged with error but I do not know why
Could this be a hardware issue with this specific unit? Has anyone experienced something similar or has any suggestions?

RE: knx ip interface problems - Daniel - 13.04.2026

LM physical address in on different line, is the setup correct?

RE: knx ip interface problems - Andrea Becagli - 13.04.2026

(13.04.2026, 11:47)Daniel Wrote: LM physical address in on different line, is the setup correct?

Yes, I have a main Area with two lines both of line couplers are completely open so they should not be a problem

RE: knx ip interface problems - Daniel - 13.04.2026

Just for a test change multicast addres to something else. What are the other KNX settings?

RE: knx ip interface problems - Andrea Becagli - 13.04.2026

(13.04.2026, 11:59)Daniel Wrote: Just for a test change multicast addres to something else. What are the other KNX settings?

I have tried changing them to try different things but i will attach a screenshot of knx params connection (since roolback did not work I updated back to 20251204)

I will try changing the multicast address