This is a sophisiticated unit, and a little User Manual study is usually necessary to use it.

That said, if you were to load the "SPDIF A->B" routing, that might do it for you (I'm assuming you have an H8000 and not an A or FW). Look at:

1) LOADING ROUTING CONFIGURATIONS on p.19 

2) "SP DIF A->B" on p.20