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 this pulse are that it has a minimum pulse, a maximum pulse, 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 rotation in the clockwise direction as it does in the counter clockwise direction
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