Topic: RME and Focusrite ISA One

I've been trying to connect the Focusrite to my Babyface via a toslink cable, but I'm getting no signal inside the Totalmix. If anyone can help me it would be great. The Focusrite people told me to figure out how to set the sample rate as well as setting the syncing source on the Babyface, two things I don't know how to do either.