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+--- Thread: Modbus mapping help (/showthread.php?tid=6220)
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RE: Modbus mapping help - sunhailun - 17.12.2025
(17.12.2025, 14:17)Daniel Wrote: Check if cables are correctly connected. Try swapping A and B
I will try that later, but thanks anyways for your support. much appreciated.
RE: Modbus mapping help - sunhailun - 19.12.2025
(17.12.2025, 14:17)Daniel Wrote: Check if cables are correctly connected. Try swapping A and B
Sorry me again
So I have tried to swapped A and B for both RS485-1 and RS485-2, didn't help.
I am attaching the 105E (the model of the thermostat) protocal and the profile I created myself.
Can you please help check if I did it right?
Thanks
RE: Modbus mapping help - Daniel - 19.12.2025
You first must succeed in the test I asked you to do, any profile creation is pointless till you get communication and you are able to read some values.
RE: Modbus mapping help - sunhailun - 19.12.2025
This while painful experience happened after a system crash, then I lost the Modbus profile, settings and all that. I mean, currently really only have 4 x RS485 thermostats connected to the LM4, which I use to map to KNX so that I can control them from a HomeKit gateway.
If the profiles are good, then I might just need to test if the RS485 ports are funcitioning. I have already ordered a USB-RS485 connector, it's on the way.
(19.12.2025, 13:17)Daniel Wrote: You first must succeed in the test I asked you to do, any profile creation is pointless till you get communication and you are able to read some values.
Ah... I thought I need a profile to do any tests... Scan and Read. Sorry~
In that case, I am really out of ideas, this is more and more leading to a faulty 485 ports