http://pastport.jp/user/xihuanou53/timeline/DM542T%20Digital%20Stepper%20Driver%201.0-4.2A%2020-50VDC The DM542T is a fully digital stepper driver developed with advanced DSP control algorithm based on the latest motion control technology.https://www.oyostepper.com/category-16-b0-Stepper-Motor-Driver.html ja-JP