The RK series incorporates a smooth drive function that is designed to ensure low vibration and low noise operation at low speeds by employing microstepping within the driver independently of the controller’s output frequency. The RK driver provides 16 resolution levels for both microstep low speed operation as well as high speed full-step operation. New driver features include improved angle accuracy control and higher starting frequency response.Oriental Motor USA Corp. www.orientalmotor.com800.418.7903