... edge duration >10μS)6,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7 ... motor free .NOTE:1, When ambient temperature is high or working current over 2.7A, fix the module ... electrical machinery runs abnormally, shake , and output is small.Please check whether the wiring of electrical machinery is ... motor driver,1.3A-4.5A,high quality and reasonable price