... as not to damage the module2,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other winding5 ... dispels the heat, to make the module run reliably for a long time.2, Half current automatically: if control machine not ... small.Please check whether the wiring of electrical machinery is a mistakeSwitch Choice: (“ON=0,OFF=1”)1,Microstepping choice: ...