I am having issues setting up the Fireface 800 as an AD/DA converter, to run it in the ADAT optical input on my Focusrite Clarett 2Pre USB (which is being used as the audio interface).

As the instructions on the RME manual are very limited, I suspect that I did some mistake when configuring it on Total Mix, since only the HOST red light is active on the front panel.

Focusrite Control does not seem to recognize the ADAT connection, although, interestingly enough, there is no sound output unless the RME is turned on. So I presume that my optical cable and the ADAT I/Os are functional.

Does anyone have any suggestions or could help me fix this issue? Please keep in mind that I'm not much of a tech guy

Ps. Ableton does not detect any changes either, it only displays Focusrite's inputs.