This is really a very clear explanation. Thank you so much for your reply and clarification. I still have some doubts though.

I have a transceiver ,which I could use for as you say and I have sensors.

Therefore, I am missing the MCU that "translates" the data (in case you can recommend something functional for this case) and the BUS communication which is not very clear to me.
In the end, based on what I would like to create, the end result should be something like this??
So my RS-485 Converters are no longer needed?

Your diagram is totally incorrect.
Taking a big step back, what you must realize is the magnitude of the project you have undertaken, there is no quick, "slap some modules together" way to do this.

Consider the reality:

Each and every different sensor node is a different, complex project by itself.

You need to design an electrical interface between the sensor and the MCU, you then have to physically build this hardware.
Then write the code for that specific sensor interface...
The code that communicates with the serial port can be basically the same, with some provision for setting a unique device ID.

You need to build, test, and debug each sensor node BEFORE you would ever attempt to connect them all to a common bus.

THEN you have the difficult task of debugging the whole thing, with all nodes working, as a system.

Having done this a few times, it's non-trivial, and can take weeks- even when you know what you are doing.

 

Your diagram is totally incorrect.
Taking a big step back, what you must realize is the magnitude of the project you have undertaken, there is no quick, "slap some modules together" way to do this.

Consider the reality:

Each and every different sensor node is a different, complex project by itself.

You need to design an electrical interface between the sensor and the MCU, you then have to physically build this hardware.
Then write the code for that specific sensor interface...
The code that communicates with the serial port can be basically the same, with some provision for setting a unique device ID.

You need to build, test, and debug each sensor node BEFORE you would ever attempt to connect them all to a common bus.

THEN you have the difficult task of debugging the whole thing, with all nodes working, as a system.

Having done this a few times, it's non-trivial, and can take weeks- even when you know what you are doing.

Weeks might be a tad optimistic. It could take years.

 

Thank you very much everyone. I greet you by saying one last thing.
I think that no one is born omniscient and that I think it is normal to ask wrong questions or that, perhaps, may seem repetitive in your eyes. Unfortunately, as I explained in the first messages, I'm new to this world and I don't know the mechanisms very well, I'm learning them slowly. Unfortunately I have a project that I had to complete in the short term, but from how you have made me understand it takes a while, so I'll have to set it aside.

Thanks in any case to those who have addressed, despite everything, in a respectful and understanding way.