... ,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other winding5,PUL+,PUL -:Stepping pulse input+5V (Rising edge effective ... , rising edge duration >10μS)6,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7 ... .7A, fix the module on big metal shell , or use axle flows fan dispels the heat, to make the module run ...