... +,ENA-: motor free .NOTE:1, When ambient temperature is high or working current over 2.7A, fix the module on big metal shell ... by mistake, thus would damage the driver seriously. The protecting circuit is within this driver, when users connect by mistake, the ... current;1=half current4,Pulse choice:In the driver has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality ...