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I do not have either the PW-2 nor the KV.
But other models (since K4) have series resistors in the Tx and Rx lines.
On the other models, almost too close to the connector pads.
Look closely, you should be able to find them, even though I think Amazon moved them back from close to the connector pads.
Hint: With a very bright light, you can see through the solder mask and first layer of board.
Sometimes it helps to take a high res. photo of the area of interest under that very bright light, and then gimp it to death to see the buried traces more clearly.
Hint: replace the pad with a tiny dab of conductive paint/ink - thin enough to run down into the via.
See my "Paint and Play" thread.
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