"you need the tool X-CTU

setup one as PANID=123, MY=1, DL=2, DH=0, Channel=C

and the other as: PANID=123, MY=2, DL=1, DH=0, Channel=C

then connect both modules to some PC start a terminal on each and try if you can see characters typed on one pc…"

"you should test them standalone first (without the FC / NC).

BTW: I have constructed an "mobile mk-tool" and I use it with similar adapters. (see picture)toolneu.png"

"can you describe the problem a little but more in detail ?

to control 4 motors usinf and rc radio you can just connect 4 motor controllers to 4 rc channels and setup some mixers in your radio.

But if you want to fly a quadrocopter, that won't be…"

"anyone has tested em406 with arduimu ?

I have it working directly with the ardupilot, but it does now work wirh the arduimu. I am new to the project an it is difficult for me to debug this."