Thank you @gemini86 for your response. I think the wiring is correct now because the python can actually run the fans.
I think the problem now is just trying to get that python file to work in Nodered.
I'm trying to read the status of a working fan (i turned it on physically so it's spinning), but have an error of reading ('sequential dequeue command not possible') as shown in the picture:
This is my setting of the Modbus Read node from node-red-contrib-modbus"
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