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The controller has three frequency signals: high frequency 5.4kHz-160kHz, mid frequency 540-16.6kHz, and low frequency 80-2.4kHz. Different stepper drivers may be labeled with different names: EN = ENA = FREE (enabled), PUL = PULS = CLK (pulse), DIR = CW = CWW (direction). Dimensions: 38.6 x 58 mm, Voltage: 24V/12V, can generate pulse and PWM signals. Used to control motor rotation and speed, compatible with various two-phase or four-phase stepper motors. Suitable for CNC equipment, DIY projects, robot control systems, etc.