PMC006A4S is a kind of miniature integrated stepper motor microstepping controller, which can be directly installed in the rear of 42/57 etc series stepper motor. The series controller is controlled by RS232 bus. It is easy to achieve industrial control network of as many as 120 nodes by using PMC006A4S controller, which would have excellent noise suppression and excellent motion smoothness. PMC006A4S provides a simple and rich set of control commands, which not only greatly simplifies the complexity of the upper layer control system, but also maximally reserves flexibility of control, and is especially suitable for various industrial applications that require low vibration, high precision and wide voltage range.