The ARS-USB is designed around one of the most powerful and versatile microprocessors PIC18 family. Their Flash technology allows you to reprogram without hardware changes.
This microprocessor incorporates in its core a USB port as specified USB rev 2.0. which it is detected by the computer as a serial/COM port, plus 10-bit ADCs. 10 bits means you can get 2 ^ 10 = 1024 different states of an analog signal, applied to a rotator with 360° rotation, provides the following resolution:
Resolution (max) = 360 / 1024 = 0,35º
That is, the ARS-USB connected to a motor and properly calibrated for 360° rotation, it can get the motor position each 0,35º.
As the ADC operating in the range of 0-5V and rotators typically provide different ranges, the ARS-USB includes a conditioner electronic using Op IC and a simple adjustment via a trimmer which allows to adjust the ranges of any antenna rotor to the ADC input. It also includes a filter to prevent and reject any signal that might be induced.