You need to connect from the TR1 terminal block on the ST2 to the external control connector on the back of your G-5500 rotor control box. Just match up the signal functions and you should be all set.
Here is the mapping:
ST 2 G-5500
Pin 1 Pin 3 (rotate up)
Pin 2 Pin 5 (rotate down)
Pin 3 Pin 2 (rotate right/CW)
Pin 4 Pin 4 (rotate left/CCW)
Pin 5 Pin 1 (elevation reading)
Pin 6 Pin 6 (azimuth reading)
Pin 7 Pin 7 (+13 VDC)
Pin 8 Pin 8 (Gnd)
- Glenn W9IQ