... as not to damage the module2,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other ... mistake, thus would damage the driver seriously. The protecting circuit is within this driver, when users connect by mistake, the ... .Please check whether the wiring of electrical machinery is a mistakeSwitch Choice: (“ON=0,OFF=1”)1,Microstepping choice: ...