Erdin:
Graynomad:
What I'm doing is a ring network, is that what you mean by "cascaded"?Perhaps I used the wrong term, I think it is called daisy chain.
How-To: Daisy Chain Arduinos via Serial - Make:
uhmmm it sounds good but I think there is the problem to connect the last arduino tx to first rx... too long! For 2-3km I need some serial repeater...