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difficulty implementing modbus


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Good morning friends.
I need help in making modbus application.
I would like to make some simple commands to understand how this communication network works.
I need to read inverter current frequency, read inverter input on or run and simple triggering things.
See software I made for the Yaskawa V1000 inverter, forward and reverse but I have doubts what was really done in addressing.

I'm going to make a screen where it will show the inverter bits on or off and at fault.
It also happens that the inverter communication fault only disappears when it starts to start the motor, that is, it seems to establish communication only in this case.

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