Modbus network between Arduino and HMI

Hello, I am new to Arduino, need help !!
I have experience in PLC and HMI, but I'm new to Arduino.
I need to display the data read by the Arduino UNO, analogical and digital in an HMI, the Modbus network with Max485 board
I will use the Arduino only as a data collector, to be displayed by the HMI and then for it via WEB.
I studied several reports examples, but the vast majority is defective.
Could someone please help me?
There are so many options that the end can not solve.

Thank you !!

I studied several reports examples, but the vast majority is defective.

Well, sure. That's why people went to the time and effort of posting the reports. It was just to make your life difficult.

Now, have you a shred of proof to back up that unfounded claim?

Certainly, you really claims that all the codes that you find in research work?
You really believe that?
You have 100% accuracy in the polls?
If yes, it is a genius, an enlightened being.
Thank you for any help.
Do not waste your time answering me