The DMX chart is in the back of the manual. There's a PDF in this link:
http://www.photonlexicon.com/forums/...ight=hot+offer
about half way down posted by Hak.
Also realized I have the LK-PD2. Not sure of the differences between the two...
As for controlling the size of the gratings, you won't be able to via DMX. The effects are on a wheel post-galvo. I've been thinking of creating a manual hard-cutoff aperture for the front of the unit but haven't gotten around to it yet.
-rick