Z-5500, Optical Digital cable to TV

Sup, I just got my Logitech Z-5500 speakers. I bought a optical digital cable and connected it directly to my hd crt tv (slimfit samsung) so all audio that is outputted goes through the speakers. The logitech control center says "No digital data" when i switch it to optical. I'm thinking it's set up correct (optical to optical).
Any suggetions or solutions?

Thanks