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It sounds like you have the correct setup, I use such a setup myself, just on a D8R-XP Rx. To rule out obvious possibilities, check you have the correct side of the FAS-100 connected to the battery and check the signal wire (yellow? not black) is connecting to the RX pin. Mike. So, I bought a real ...

Thanks Mike. I bought the supposed FAS-100 from a guy over on the RCGroups forum, and it transpired that he (unknowingly??) shipped me one of the FAS-40 relabeled to FAS-100. As posted earlier the In/Out labels are swapped - so this could explain why I am not seeing any readings. Now FrSky did state...

I have a Flysky 9x, with relevant Smartieparts boards, and am running ER9X-R803 FrSky NOHT. I have a FrSky FBVS-01 voltage sensor hooked up to port A2 on a D8R II Plus receiver, and that setup works just fine and it displays the 4S battery voltage correctly. I now added a FAS-100, and it is connecte...