I can't understand your question... "How its the correct routing?"
Are you trying to use the TDIF connectors for something? What is it you want to connect?
You originally asked how you can bypass the DM's pres using TDIF. The DM's preamps are used for analog connections into the Mic/Line inputs. The TDIF inputs are used for digital signals only.
Input routing is on page 59 of the original manual. Select the TDIF connector you wish as the Source, you can assign them to individual channels or in blocks of 8. You have to push "enter".