Best protocol/way to simply connect 2-3 Arduinos to main Arduino

[anon57585045]

@MikkelD

The RS-485 would in my case be an unneccesary harware layer. I dont think my envirement is that noisy, and it is just a couple of meters wire max. If I have some trubble with noise, I wil try using shielded cable.

Well, you seem to know exactly what you need. That makes it kind of pointless to offer advice.