Connecting multiple RS485 together I am trying to build communication across multiple Arduino using RS485. When i am trying to connect 3 Arudino nano together using breadboard my code doesn't reach slave where as if i just if i do direct connection between 2 RS485 without breadboard it works but i use breadboard for 2 it doesn't work. Am i missing any setup here?

Breadboard connection - A &amp; B are connected to + &amp; - of both RS485.

Working connection - A &amp; B of first RS485 connected to A &amp; B of 2nd RS485.
It is possible you have too many resistors on the RS485 bus. From the RS485 wikipedia page there is this quote:  


  Ideally, the two ends of the cable will have a termination resistor
  connected across the two wires.


This may explain why you can use 2 of your RS485 interfaces but not 3.  Consider removing the resistors from the RS485 board in the middle if possible.