The DMX input port can receive DMX512 levels from another controller and use that information to trigger Memories.
You can select which Memory Page the DMX triggers and the starting Memory number. Slot #1 from the DMX will control the first memory and subsequent memories will be controlled by the following DMX slots.
NOTE
When DMX In is mapped to a Memory page and DMX is present at the In port, you cannot control the Memories manually. The DMX will always "win" and change whatever level you set on the sliders.
You need to specify what Memories you'd like to control and how.
NOTE
You can also receive eDMX from controllers using the Pathport Protocol, sACN E1.31 or Art-Net by changing the Input Protocol from DMX. In that case you must choose a Universe number as well from the edit box which will appear when the Input Protocol is not DMX.