Need some advise on making five PICs communicate to each other

[gadelhas]

Thanks M8. Got one more for you.
I have 4 slaves, lets say they all have RJ45 type connector (for easy application). So one wire comes out from them, 4 in total.

How does one master connects with 4 slaves in terms of hardware. I have seen RJ45 splitters http://www.tvcables.co.uk/cgi-bin/tv...-splitter.html
Will I need 3 of these? (two plugged into 1)

Humm... i think you must read something about RS485 to clarify your doubts. Google for RS485, but in meanwhile, RS485 uses two wires ( BUS) and all the modules connect in parallel to this two wires.

Check also the datasheet of the MAX485 or the LTC485 and you can see how it works.