... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE: ... 1, When ambient temperature is high or working current over 2.7A, fix the module ... and output is small.Please check whether the wiring of electrical machinery is a mistakeSwitch Choice: (“ON=0,OFF=1 ... Stepping motor driver,1.3A-4.5A,high quality and reasonable price