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+--- Thread: KNX/TP: Transmitter Error (send 0 receive 1) (/showthread.php?tid=6337)
KNX/TP: Transmitter Error (send 0 receive 1) - puntukas - 07.03.2026
After changing from LM4 to LM5 I've got such error:
Script name "system": KNX/TP: Transmitter Error (send 0 receive 1)
HW: LM5 Lite + Ext (i.MX6)
SW: 20251204
What does that mean and what should I do?
thanks
RE: KNX/TP: Transmitter Error (send 0 receive 1) - Daniel - 08.03.2026
This can show when many telegrams are sent at once or bus is very busy. This is just direct report from KNX chip. Check if some scripts/schedulers do not activate something at the same time. If it just happened once you can ignore this.
RE: KNX/TP: Transmitter Error (send 0 receive 1) - puntukas - 08.03.2026
Thanks!
is there any way to get LM CPU Temperature?
RE: KNX/TP: Transmitter Error (send 0 receive 1) - admin - 09.03.2026
Use this:
Code:
temp = io.readfile('/sys/devices/platform/soc/2100000.bus/2198000.adc/iio:device0/in_temp_input')
temp = tonumber(temp) / 1000
log(temp)RE: KNX/TP: Transmitter Error (send 0 receive 1) - puntukas - 31.03.2026
Still getting warning on my new LM machine:
KNX/TP: Temperature Warning
Version: 20251204
CPU/IO: 0.90 0.69 0.41, Memory: 15%, KNX/TP: OK
KNX/TP: Transmitter Error (send 0 receive 1)
BTW: I wish there would be an easier way to copy several error messages
RE: KNX/TP: Transmitter Error (send 0 receive 1) - admin - 01.04.2026
See this: https://forum.logicmachine.net/showthread.php?tid=6369
RE: KNX/TP: Transmitter Error (send 0 receive 1) - puntukas - 01.04.2026
(01.04.2026, 06:56)admin Wrote: See this: https://forum.logicmachine.net/showthread.php?tid=6369
Thanks, I've read the thread.
In that example there were a lot repeats, in my LM - not so many (see attachment).
I can only catch repeating telegrams by monitoring ETS? No quicker option?
Thanks a lot!
RE: KNX/TP: Transmitter Error (send 0 receive 1) - admin - 01.04.2026
You have a very low number of repeats so it's not a problem. Most likely the warning appears when LM is sending many telegrams at once.
You can install Group monitor app in LM and see all telegrams in real-time. It highlights a different kind of repeats - when the same value is sent multiple times.
The same advice applies:
You should either use virtual group addresses or disable "write to bus" option where applicable. In scripts use grp.update/grp.checkupdate for such group addresses. Use grp.checkwrite where possible to lower the bus traffic. Adjust send delta for Modbus devices if any.
RE: KNX/TP: Transmitter Error (send 0 receive 1) - puntukas - 01.04.2026
In forum I've read that there is no option to export from LM group objects, is that right?
And thanks, I really appreciate your quick and informative replies!
RE: KNX/TP: Transmitter Error (send 0 receive 1) - admin - 01.04.2026
There's a script that creates CSV for ETS: https://forum.logicmachine.net/showthread.php?tid=5035&pid=32601#pid32601
Make sure to backup your ETS project before importing CSV.
ETS does not handle custom data types that are used in LM like 255 byte string and 4 byte RGBW. Importing such objects can crash your ETS project.