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
