Tell us about yourself!
In parasitic mode, you need to connect VDD to Ground. Additionally, you may need to replace the resistor as with 4.7kΩ the sensor may not get enough power to run at all.On a 10 meter cable run with parasitic power, I get reliable results when resistor is less than 2kΩ. With 4.7kΩ, I got over 95% read fails. With 2.3kΩ I got around 18% fails. With 1.9kΩ I get 1.7% fails.