I wired the power supply and the motor to the K243 without the 1-2ms input, and the motors didn't work... maybe I need to try it with the 1-2ms with my arduino?
The 1-2mS input is designedfor standard R/C equipment, Itsimply converts the 1-2mS1-2mS (Radio Control) INPUTInput to an analogue voltage.It allows you to vari the speedof your motor throu themovement of your R/C transmitter'sjoystick. The 1-2mSinput should be connected tothe terminals marked "GND"and "SIG". The analogue outputis available at the terminalmarked "A" and needs to belinked to the terminal marked"C" if the R/C input is used.Note: The external pot must notbe connected if you are usingthe R/C input. VR1 & VR2 areonly to adjustment the 1-2mS(Radio Control) input if used.CONNECTIONNOTE:For use with the R/C input, linkterminal A with terminal C