VCC positive supply 10-60V, be sure to set before energizing voltage adaptation GND Negative , if you want to reduce the external interference shielding box connected to terminals or here at the cathode connected to the power supply M+ Motor positive M- motor negative Length: 9.5cm width: 7cm height: 3.5cm Length of line: 40cm Control port : 5V: driver board internal 5V power supply, the output capacity of less than 100mA, with potentiometer mode is recommended only to use , do not drive other circuits PWM: external PWM control signal input level range ,3-20V , 2mA current requirements ; ADJ: external 0-5V or 0-10V control signal input GND: ground control signals , such as the shield shell is not allowed to pick pick here is also not allowed in this place other circuits connected GND, DOWN: control signal, the internal coupler control signal and GND effective turn ( optocoupler turns on, can also be used microcontroller , NPN switch control ) UP: control signal, the internal coupler control signal and GND effective turn ( optocoupler turns on, can also be used microcontroller , NPN switch control ) STOP: control signal, the internal coupler control signal and GND effective turn ( optocoupler turns on, can also be used microcontroller , NPN switch control )