Welcome to eLinux.org!
We hope you will contribute much and well.
You will probably want to read the help pages.
Again, welcome and have fun! Wmat (talk) 10:36, 19 September 2016 (PDT)
12v or 5v ?
12V, I'm sure about this. I also checked with a multimeter, and measured 10.67V between Tx and ground on the Engine Controller (if I remember correctly :) ).