... the module2,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other winding5,PUL+, ... edge duration >10μS)6,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, ... low reverse7,ENA+,ENA-: motor free .NOTE:1, When ambient temperature is high ... on big metal shell , or use axle flows fan dispels the heat, to make the module run ...