Stepper motors have three drive signals: input signal, output signal and enable signal.
The input signal is used to receive the control signal, and the output signal is used to connect the stepper motor winding.
The stepper motor drives the motor to rotate according to the given signal.
The pulse signal is used to control the speed of the stepper motor, the direction signal is used to control the direction of the motor, and the enable signal is used to make the stepper motor run.