... +,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 ... , thus would damage the driver seriously. The protecting circuit is within this driver, when users connect by mistake ... Stepping motor driver,1.3A-4.5A,high quality and reasonable price