 Some new models of scrollers are moving towards the RDM protocol and are using small LED screens for addressing and other settings on the unit.This new method of control allows for easier addressing and the ability to "talk-back" to each scroller (to get, for example, diagnostic information).Morpheus colourFader3 units, among others, have direct push-button addressing for DMX with an LED display that provides complete set-up status information for each unit.