Wiring instructions: 1. The positive pole of the red wire power supply, the negative pole of the black wire power supply, the blue wire for speed control, the green wire for signal feedback (to measure the speed), the yellow wire for reversing. 2. PWM Speed control port: PWM frequency range 5KHz-20KHz. 3. Green wire speed feedback, connect to oscilloscope probe or host computer. 1 pulse/revolution. 4. Running at full speed, the red wire is connected to the positive pole of the power supply, and the black and blue wires are connected to the negative pole. CCW/CW(direction change)