Arduino master/slave communication using RS485 I am using Arduino Uno as a Master Device and 3 Arduino Unos as slave devices.

I am sending data from each slave to master after every 3 seconds continuously, and is going to execute further logic accordingly.

I have been using a lot of libraries to test this scenario.
There are libraries which are using SoftwareSerial and HardwareSerial too, but these libraries are not working for me when i have multiple slaves and one master (It is only working with one master and one slave).

Please suggest me a better library which would be useful in my scenario.

Wiring Diagram:
First of all, your connection is just wrong, you should make the RS-485 bus as a straight line, with a 120 ohm resistor at the beginning and another one at the end. Each slave should tap into that line as close as possible to that line, look for datasheets and you will understand what I am talking about.

Second, you can use Modbus as a pretty good and easy to use communication protocol.