... ,DIR +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE:1, When ... ambient temperature is high or working current over 2.7A, fix the module on ... current4,Pulse choice:In the driver has a jump5,installation dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price