KNX/TP: Transmitter Error (send 0 receive 1)

[puntukas]

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

[Daniel]

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.

[puntukas]

Thanks!
is there any way to get LM CPU Temperature?

[admin]

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)

[puntukas]

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

[admin]

See this: https://forum.logicmachine.net/showthread.php?tid=6369

[puntukas]

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!

[admin]

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.

[puntukas]

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!

[admin]

There's a script that creates CSV for ETS: https://forum.logicmachine.net/showthrea...1#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.