... ×76mm×33mm6.Weight:<300g.7.Working environment:Temperature-15~40°C Humidity<90%.I/O Ports:1, VCC+:DC power positive ... as not to damage the module2,GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other winding5 ... small.Please check whether the wiring of electrical machinery is a mistakeSwitch Choice: (“ON=0,OFF=1”)1,Microstepping choice: ...