X20/X20S and Ethos v1.0.11 User Manual
ADC2
Some receivers support a second analog voltage input, which is available in
telemetry as sensor ADC2.
2. 'External' Sensors
The current FrSky telemetry system makes use of FrSky Smart Port sensors. The X
and S and later series of telemetry enabled receivers have the Smart Port interface.
Multiple Smart Port sensors can be daisy chained together, making the system easy to
implement. Most receivers also have either one or both A1/A2 analog input ports,
which are useful for monitoring battery voltages, etc.
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