I ran my coro stuff with pixelnet USB last year, and I've repeated it with pixelnet EtDs this year.
first, make sure your 3-channel controllers are properly set with a starting channel number. You can use a DMX dongle, or a test cable to check it out.
as the others have said... if using a pixelnet dongle (USB or EtD), you need to translate the pixelnet protocol to DMX, and to do so requires using the Smart Hub. It will mirror a page of the 4096 pixelnet channels so that you have 512 of them available as DMX channels.
The DMX channels will still be numbered in the range of 1-512... even though you might have them mirrored from a page anywhere in the 4096 channels. For example: DMX channel 1 could be pixelnet channel 1025 if you selected the 3rd DMX universe (page).
Steve