Wikipedia
Servo control from a radio control receiver to the servos is done by sending each servo a PWM ( pulse width modulation) signal, a series of repeating pulses of variable width.
Small radio control servos are connected through a standard three-wire connection: two wires for a DC power supply and one for control, carrying the pulses.
The parameters for the pulses are a minimum pulse width, a maximum pulse width, and a repetition rate. Given the rotation constraints of the servo, neutral is defined to be the position where the servo has exactly the same amount of potential mechanical rotation in the clockwise direction as it does in the counter clockwise direction. It is important to note that different servos will have different constraints on their rotation but they all have a neutral position, and that position is always around 1.5 milliseconds (ms).
Usage examples of "servo control".
As it was, his nanocomputer had to take over servo control briefly to restore his balance.
Small to begin with, banks of monitoring and servo control equipment made it claustrophobic.