It's simple to hook up. A single cable from the s/pdif output of the Rosetta to the s/pdif input on the digi. The cable carries the left and right channels. The Rosetta only takes a XLR, so I use a 1/4" or TRS to the XLR inputs.
would i still need to get a D/A conv. for the output if i get the A/D rosetta for the input so i can hear the what was recorded