Dave, I've had some my 1221's not work at all unless ALL the satellites are plugged in.
Maybe there are some ports that need to be plugged in? Or maybe all the ports? From what Harley says, it seems like only two need to be used.
And make sure you use the satellites that came with your 1221. I've used the new "DSMx" satellites with an older 1221 and could not get it to bind or work either.
Last edited by ravill; 05-27-2014 at 08:20 AM.