Problems connecting my mixer to Ardour!

First of all, Hello!

I am trying to hook-up my Yamaha DM 2000 to Ardour and the problem is that for anything I operate on the mixer (button, rotary or fader) Ardour executes only two functions: PLAY/STOP. In other words, if I push the “play” button on the mixer, Ardour will start to play. If I push “play” button again, Ardour stops, and so on, regardless of the operation on the mixer.
Does anyone have any suggestion?

TY in advance.