FrSky X8R 8/16ch Full Duplex Telemetry Receiver

The Smart Port is a bidirectional, full-duplex telemetry bus that allows the X8R to communicate directly with FrSky's digital sensors (e.g., GPS, variometer, battery monitor) without requiring a separate sensor hub. It transmits real-time flight data back to your transmitter and is also used for firmware updates.

You can access all 16 channels by using the SBUS output port with an SBUS-capable flight controller or servo decoder. Alternatively, for direct PWM servo control, you can combine two X8R receivers; the first handles channels 1-8 via its PWM ports, and the second, bound to the same transmitter, handles channels 9-16.

Yes, the X8R is backward compatible with the D8 protocol. When bound in D8 mode, it works with DHT, DJT, DFT, and DHT-U transmitter modules. In this mode, you are limited to 8 channels, but you retain full access to the Smart Port telemetry system and digital sensors.

The RSSI pin provides an analog voltage output (0-3.3V) proportional to the received signal strength. This voltage can be connected to a dedicated RSSI input on most flight controllers (e.g., Betaflight, iNAV, ArduPilot) for onboard signal strength monitoring and logging, or for triggering low-signal warnings in your OSD.