Batboard

Does the cm300 require a different cable than the m1225? to go from rib to radio.

Yes, sort of.

M1225 uses the standard Maxtrac/GM300 style cable:
http://www.batlabs.com/images/maxpin.gif

CM300 uses the same cable, except with two pins shorted. Read Todd's discussion here:
http://batboard.batlabs.com/viewtopic.p ... m300+cable

FYI, there's a button above labeled "Search"... it's pretty useful.