1.this module is a pulse generation module, supply the control signal to stepper driver.To control the stepper motor, it must be equipped with a drive.2.this simple controller + stepper motor + stepper motor + DC power supply can be composed of a simple set of control platform.3.the controller has high 5.4k-160khz, middle 540-16.6khz, low 80-2.4khz total of 3 kinds of low frequency signal can be used to select the jumper.4.can produce pulse signal, can also produce PWM signal, can choose the jumper.5.the frequency of measurement: PUL and common cathode end.EN==FREE EnablePUL=PULS=CLK PulseDIR=CW= DirectionCommon anode Connection method (B)EN+ PUL+ DIR+ connect together to com+.EN- connect ENPUL- connect CLKDIR- connect DIRcolour:blackmaterial:PCBPackage Contents:1 x Pulse Signal Generator to Stepper Motor Driver ModuleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.