... Ports:1, VCC+:DC power positive poleNote:Must guard against exceeding 50V,so as not to damage the ... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE:1 ... a long time.2, Half current automatically: if control machine not send out signal in half second, driver ... dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price