Project Mix - I'm stumped

OK, so a Project Mix was purchased for me on ebay.

I've been running a Digi 002 with Protools 8LE.

I know that in order to just use the Project Mix I would need to upgrade to Protools 10.

My question is:

Can I just use a Firewire cable from the Project Mix to my Digi002?

I have no desire to use more channels than the 8 on the project mix. I've searched around here quite a bit for about 6 hours trying to find this answer including the project mix owners manual online.

Am I missing something?

Thanks everyone!