... 5)Microstep:4--256;10--250 Description of step drive2M420 2-phase stepping driver Key Features: 20 ... 2-phase, 4, 6 and 8 leads step motors, with Nema size 17 Output current selectable ... from 0.9 ~ 3.0A peak Current reduction by 50% automatically, when motor standstill mode is enabled ... .The general pseudo-sinusoidal current control technology adopted by majority of the drive produced distorted sine wave, ...