phisically i´m having short circuit and ground loops problems, the arduino turns off and overheats, i cannot make communication because of these issues. i´m using the white wires as a button when they touch(input pullup), i have both arduinos connected to the pc at the same time via usb.
The first thing I see is no ground connection (although there will likely be a poor one via the USB connections) for the second Arduino. It is almost impossible to trouble shoot from pictures. Your best bet is to upload the sketch (the .fzz file, upload is 7th icon from the left in the reply menu) which would allow us to look at the connections and make suggestions.
edit:
there is also no ground on the right most 485 module which I expect will make it not work as these modules are typically optically isolated from the input, so if both power and ground are not supplied on the output end it won’t work.
Peter