diamonoid

Greetings, I just purchased a new Casio Privia PX 560M and I'm really enjoying it. The only thing I can't figure out is how to use it as a MIDI controller for my Yamaha Motif Rack ES. I've connected the MIDI cable but I can't figure out how to make the sounds come out. Any assistance would be greatly appreciated. The MIDI cord is connected to the Yamaha Rack's "midi in" and to the the PX 560M's "midi out".