There are two types of PIC Interfaces. Below, the setup procedure:

Connect the interface to your PC & transmitter.
With crystal removed, turn on transmitter.
Open FMS, and under Control, select Analog Control.
Select PIC Serial Interface.
Click on Resources.
Select the correct COM port.
Select 19200 Baud.
Click Ok.
Click on Mapping/Calibration.
Click Calibrate, and follow on-screen calibration procedure.
Your interface should now be calibrated.

If the movements are irratic or no response, try to select 9600 Baud, and try recalibrating the interface.

To test your interface, you can download the Test Software from my web.

If above does not work, it might be that your interface is faulty, or maybe your PC is fitted with a new generation COM port, which the voltage levels are below 4.7V.