... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE:1 ... ambient temperature is high or working current over 2.7A, fix the module on big metal shell , or use ... long time.2, Half current automatically: if control machine not send out signal in half second, driver enter ... Stepping motor driver,1.3A-4.5A,high quality and reasonable price