Fangrui Product Details This Lc V2f Module Can Generate Different Frequency According To Different Input Voltage, And It Can Transform 0-10v Voltage Into 0-10khz Frequency Pulse Signal.operating Voltage: 13.5v-30vinput Controllable Voltage Range: 0-10voutput Frequency Range: 0-10khz Specification: Interface Definitionvcc: Operating Powergnd: Power Groundin+: Input Voltagein-: Input Groundocout: Signal Collector Output Port (if You Use It With Driver, It Can Be Used)fout: Frequency Output Port (universal Frequency Output Port)two Independent Outputs, Oc-out Is Npn, And Freq-out Is Ic Output. The Common Cathode End Is With The Negative Gnd Of The Power Supply. When Common Anode Connects, It Is Used With Power Positive. If The Connection Is Common Anode And Power Supply Is 13-24v, Please Serial Connect A 2.7k Ohm Resistor; If The Power Supply Is 12v, Please Serial Connect A 330 Ohm Resistor.connect The Frequency Pulse Signal To F, And There Is A Corresponding Voltage Output At The Terminal. Correspondence Between Input And Output: 1v=1khz 10v=10khz. If There Is A Deviation, You Can Adjust The Potentiometer On The Board To Calibrate. Package Includes: 1 Piece Voltage To Frequency Conversion Module