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+--- Thread: knx ip interface problems (/showthread.php?tid=6387)
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.
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
RE: knx ip interface problems - Andrea Becagli - 24.04.2026
(13.04.2026, 12:17)Andrea Becagli Wrote:(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
Hi, do you have news for me? Do I have the wrong setting on my LM?
RE: knx ip interface problems - Daniel - 24.04.2026
We were waiting for your update
'I will try changing the multicast address '
Did it helped?
RE: knx ip interface problems - Andrea Becagli - 24.04.2026
(24.04.2026, 09:22)Daniel Wrote: We were waiting for your update
'I will try changing the multicast address '
Did it helped?
Oh sorry no, it did not change anything
RE: knx ip interface problems - Andrea Becagli - 27.04.2026
(24.04.2026, 09:23)Andrea Becagli Wrote:(24.04.2026, 09:22)Daniel Wrote: We were waiting for your update
'I will try changing the multicast address '
Did it helped?
Oh sorry no, it did not change anything
Do you have any news? I saw a post with a similar problem and a similar setup since my client network is based on a mikrotik router and I tried LM from my mikrotik router. Nothing I have not done in the past and always worked but maybe I am missing something.
RE: knx ip interface problems - Daniel - 27.04.2026
Still waiting for your update.
RE: knx ip interface problems - Andrea Becagli - 27.04.2026
(24.04.2026, 09:23)Andrea Becagli Wrote:(24.04.2026, 09:22)Daniel Wrote: We were waiting for your update
'I will try changing the multicast address '
Did it helped?
Oh sorry no, it did not change anything
Sadly It did not change anything