1.this module is a pulse generation module, supply the control signal to stepper driver.To control the , it must be equipped with a drive. 2.this simple controller + + + DC power supply can be composed of a simple control platform. 3.the controller has high 5.4k-160khz, middle 540-16.6khz, low 80-2.4khz of 3 kinds of low frequency signal can be used to select the jumper. 4.can pulse signal, can also PWM signal, can the jumper. 5.the frequency of measurement: PUL and common cathode end. EN==FREE Enable PUL=PULS=CLK Pulse DIR=CW= Direction Common anode Connection (B) EN+ PUL+ DIR+ connect to +. EN- connect EN PUL- connect CLK DIR- connect DIR colour:black material:PCB Package Contents: 1 x Pulse Signal Generator to Driver Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.