Besides the make, how many are you using? Have you set the DMXaddress properly? Are you able to control it with from the console or is it just doing stuff when you power it up?
My GUESS is that they probably are not addressed correctly. Each one would need an address set either all the same address or individual address or any combination between.
OK, these things are a pain if they dont work the first time around since there are returns and things of that matter, Ill walk you through a way that I trouble shoot these and it always works for me. First, Make sure your distro or repeater is getting DMX, Then set all the units to the same DMXaddress then shoot it some signal at that address.( if your units use this) make sure your cable lengths are not that long and be sure your distro can take so many scrollers on one out put ( Ive seen a situation where renter put all scrollers on one output) and be sure that you return your signal to the distro if your scrollers use that.