Help Please - Pololu Controller - Mirror Project Continued

Hi all.  You may remember us from a discussion a while back concerning
building a large mechanical mirror (Subject = Linear Motion Control- Servo?)
Anyway we have come a bit closer, but not much .  We are at the stage where
we have a Pololu Micro Serial Servo Controller hooked up to a computer's
serial port and a simple servo motor.  (There are two batteries attached to
the controller).  The motor moves once when plugged into the controller.
The motor moves once when sent an Enter from Hyperterminal.  Now here is the
question.  Any idea as to how we go about sending the controller/motor the
proper output to control where the motor moves?  We have the Pololu manual
but it's hard for us to really understand.   That is we really don't
understand what to put into Hyperterminal in order to get the thing to move.
Or is Hyperterminal not the way to go?  Any help on this basic issue would,
of course, be most appreciated.  Thanks, Rich and Em