Thank you for the reply...
Well, I have verified all of the relevant settings, esp those on p215 of the manual. Cable is attached from the rig ACC to the i/o port on the remote RRC. When we power up the control K3 it displays "TERM" until we power up the remote K3 and then all seems well. If we turn off the control K3, both do indeed power down. Not sure what we're missing; but, we will keep looking.
73,
N5NYM