Connect all your devices to the same network, including the Lumin D2, the Asus Laptop and the iPad. Assuming you already setup your Roon Core, open Roon in any of your remotes (iPad or Asus Laptop), go to Roon Settings/Audio and ENABLE the Lumin D2.
Make sure your iPad and Lumin are on same network. If Lumin is on either net you will probably have to connect iPad to your non-mesh network. That’s what I had to do in an Eero/Verizon environment in order to see my Ethernet-connected devices.
Did you install Roon Server software in your ASUS PC already? If not, then that’s the first thing you need to do.
Also download Roon for Windows in your ASUS PC in case you want to use your PC as remote or end point. Be aware that Roon for Windows and Roon Server are two totally different applications. Roon Server allows your ASUS PC be configured as a Roon Core without the need to have Roon for Windows open as Roon Server runs in the PC background.
As soon your Roon Core is setup and Roon Server is up and running, your Lumin D2 and iPad will show up in Audio Devices, then you have to ENABLE them in order to use them with Roon.
The audio technician informed me that because the Lumin D2 DAC does not have a USB DRIVE that I can not play my music through the D2. It will play music from or through the Roon app on computer. Is there a way to hear music thru the DAC and use Roon for information data?