Your scrollers probably run on a 4-pin cable, you should daisy-chain the scrollers in a loop to the power supply. Make sure you don't exceed the max capacity of the PSU or the max number of head feet of cable. The 5-pin DMX cable from the PSU can be plugged directly into your console to an active output. You should be able to set the outputs of your console either to specific universes or to specific DMX channels, it depends on your console. If you have a DMX through connection or DMX-out at your dimmers you can connect it there, you just need to be sure that you have enough available DMX addresses on that universe (i.e. if you have 500 dimmers and 20 scrollers, the output at your dimmers probably won't have enough addresses left as there are only 512 per DMX universe).