Alpine MBus CD changer emulator

Greetings All,

Completely new to the Arduino world, learning as much as I can.

My first project is to create a CD changer emulator to allow me to play an iPhone through a 90's vintage Alpine head unit.

I have been able to find a fair amount of information on this project, but am not sure what to do with it.

The primary reference seems to be this site: The Alpine M-Bus Protocol

Next I found a list of files on Github posted by member Olstyle, they are here: GitHub - Olstyle/MBus: Alpine MBus for Arduino

Two of the files open in the Arduino IDE and appear to be example code.

Also, the read me file from Olstyle states "you'd want to have a piece of circuitry to split the send and receive line which is shown here" that references the hohensohn site above. Would I build this circuit on a shield board then attach it to the Arduino?

Am I over my head here? Definitely. But I am very motivated to learn this stuff.

Any guidance would be appreciated!

Thanks!

Brian