... ,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 ... fan dispels the heat, to make the module run reliably for a long time.2, Half current automatically: if control machine ... in half second, driver enter half current state of automatically for electricity saving, the phase current of the winding of the ...