I also purchased some of these:
https://www.primecables.ca/p-306660-ada ... rimecables
These were intended to go from the Datapath to the projectors.
You can see on the webpage, they're listed as supporting DVI-D (dual link) resolutions. Price is too good to be true, I guess. I had less suspicion of Prime Cables being snake oil salesmen then random sources on Amazon, etc. (Though I'm having better luck on Amazon now).
I'm now trying these adapters with my datapath and getting the same max resolution of 1680x1050.
Does changing the preferred input resolution actually change what my computer is seeing on the output? Or (with the correct adapter) my computer see all available resolutions for the device?
When I plug my computer monitor in through one of these adapters 1920x1080 is detected, so there must be something I can change in Wall Designer. My computer seems to detect 1680x1050 regardless of settings.