... GND:DC power cathode3,A+,A-:Stepping motor one winding4,B+,B-:Stepping motor other winding5,PUL+,PUL -:Stepping pulse input+5V (Rising edge ... connected with driver , users are apt to connect the phase by mistake, thus would damage the driver seriously. The protecting ... circuit is within this driver, when users connect by mistake, the driver will not be damaged, but the electrical ...