JMC 2DM556 is new digital stepper motor driver which adopts latest 32-bit DSP control technology. the user can set any segment within and multi-range current valuewithin ratedcurrent, with built-in micro technology 2DM860H driver greatlyimproved stability and reduced noise under subdivision. Integrating automatic parameter tuning function inside, it also can adjust the optimal operation parameters automatically for different motor to maximize the performance of the motor.