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+--- Thread: modbus communcation error (/showthread.php?tid=6093)
modbus communcation error - balatis - 27.08.2025
Hello everyone !
I face an issue with modbus commmunication with a heat pump. I atttach you the script and manual.
I checked it with the app "modbus polling", it works properly and I read data from the pump.
But via lm i have no communication.
Have you any idea about it ?
The json-profile:
{
"manufacturer": "GREE",
"description": "pump",
"mapping": [
{
"name": "Water Tank Temperature",
"datatype": "uint16",
"type": "register",
"address": 13,
"unit": "°C"
}
]
}
RE: modbus communcation error - Daniel - 27.08.2025
Start by using Read test, check wiring and correct RTU settings.
RE: modbus communcation error - balatis - 27.08.2025
(27.08.2025, 09:50)Daniel Wrote: Start by using Read test, check wiring and correct RTU settings.
We have already done these steps, but no response.
The wiring and the rtu settings are correct.
RE: modbus communcation error - Daniel - 27.08.2025
Did you try swapping A/B?
RE: modbus communcation error - balatis - 28.08.2025
(27.08.2025, 10:11)Daniel Wrote: Did you try swapping A/B?
Yes, we tried but nothing changed.
We connected it to port 2 in the same LM and it works properly.
After that we changed LM and it works properly in port 1, because in this project we use port 2 for ekey.
So, the port 1 does not work in the first LM.
RE: modbus communcation error - Daniel - 28.08.2025
OK then contact us via email for replacement.