This chainduino looks good, but it is just arduino with on-board RS485 hardware. Still all job is done in software.
I'm thinking about encapsulating MySensors message into frame which will be sent via RS485 bus.

I know about modbus. At first I thought about using it, but it's more for industrial than home use.
I will experiment with RS485. I have some ideas, just need to find some time to test it.
Of course I will share if I get to something useful.

I don't have any protocol on RS485, I wanted to use MySensors protocol.
Idea is that I want to replace the physical layer of transmission.
Where I can place cables I want to place them, but where I can't do that I want to use radio.
I'm not using Vera, I'm going to use OpenHAB on single board computer.
I need just hint where to start.

@axillent looking at gateway's sketch I find it quite easy to modify for listening on serial interface, it just passes messages between interfaces.
But how about sensors? I find it more tricky. Do I understand it right? I mainly need to modify functions in MySensor.cpp as sendWrite and process? Or there is something else?

Hi!
Does anyone tried to connecting sensors with RS485 interface?
I was wondering if it possible to replace wireless connection with wired one and maintaining all of protocol used. Just get rid of nRF24 routines and replacing them with those for RS485.