Is anyone aware of a way to trigger the speaker on without using a remote control?

I have a multisound system in my home and I would like to trigger the BEOSOUND 9000 on as one of the source of my multiroom system.

My multiroom system (Russound C series) is able to generate a 12 volt trigger from anykeypad in the house.

How can I send this trigger to the yellow wire in the powerlink cable? Which voltage send the yellow wire to the speaker?

Any advice will be appreciated.

Thansk,

Fabio