Make sure to review Section 5 of the DP88 manual to learn more about which CC parameters need to be sent over MIDI to control preamp levels and toggle Phantom Power or Line / Mic Pre on the DP88 from your DAW.
Here is a helpful diagram showing the connections that need to be made between the devices.
Don't forget to set your clock source to External. It's the little button next to the power button.
Blue is for BNC Word Clock and Red is for ADAT Light Pipe.