ITEM NAME:DM542 Stepper Motor Driver For 57 86 Series 2-phase Stepper Motor Digital Driver.DM542 Stepper Motor Driver For 57 86 Series 2-phase Digital Stepper Motor Driver. 1 x DM542 stepper motor driver. 57 series 4.5A or less (including 4.5A) two-phase four-wire, six-wire, eight-wire stepper motor also can be used.