... +,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 ... abnormally, shake , and output is small.Please check whether the wiring of electrical machinery is a mistakeSwitch ... Stepping motor driver,1.3A-4.5A,high quality and reasonable price