Rotator control is available for all antenna rotors that use the HyGain
  DCU-1 serial protocol and also the M2 Rotor series.  This includes the
  following rotors:

     Green Heron Engineering RT-20 and RT-21
     HyGain DCU-1
     Idiom Press - RotorCard DXA
     Idiom Press - RotorCard SDX
     Idiom Press - RotorEZ
     MDS RC1 series digital rotor control box
     M2 Rotor series
     4O3A Rotator Genius