I have 4 Of rays controllers lined up side by side in order to get 36 channels. 1x 27ch and 3x 3ch. All the power and data goes into the 27ch first then cascade in/out of the other 3, 3ch ones. The problem I came across was is that the last controller in the setup wouldn't work. In fact the only way it will work is if the data + wire is disconnected from the last controller. Then every thing works sweet.