... (mm) Features:1. By using of DSP chip.2. Communication with RS485.3. Wide velocity ratio, constant torque ratio, speed regulation ... arithmetic to accomplish the PWM controlFeedback signalIncremental encoder 2500P/R with U, V,W signal(standard)Control modePosition, Speed,Test, JOG ... ), 10~60Hz(no keep running)One suitable servo motor picture : cnc servo motor driver