The undisturbed connection between my Fatuba receiver and my ESC box has three wires, black, red, and blue. The black is GND (reference), the red is Vcc (hopefully a regulated 5volts), the third is the signal from the receiver to the ESC telling it which direction and how fast to spin the wheels (what voltage and which polarity to feed the DC motor.)

This is pulse width modulation. How is this information encoded?

My guess is that a square wave (50% Vcc 50% reference) tells the ESC to not power the motor at all. A larger than square wave pulse stream says to feed the motor positive voltage proportional to the area under the pulses. A smaller than square wave pulse indicates to reverse the voltage polarity and feed power inversely proportional to the area under the pulses.

Am I close enough for government work?

Ken