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Common Ground?
Did you make sure your power supply and the RC had a common ground?
No sense putting a voltage into the sensor pin if it is not with respect to the same ground voltage.
Finally, how sure are you that you have the pinout of the Dsub connector right? It is VERY common for folks to flip left and right on those 25 pin connectors. For myself, I don't buy any connector for these types of connectors that don't have the pin number molded into the connector. There are just too many ways to flip the pins around if you are not careful.
Check it out.
Joe J.
P.S. One more thing, check your manual to see that pins 2,3,4 are the right pins. JJ
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