FrSky

Overview

FrSky systems were very common in older FPV builds. Common families include ACCST and ACCESS. They are usually 2.4 GHz systems.

Common Protocols

Protocol	Use
SBUS	Receiver control signal to flight controller
S.Port	Telemetry back to radio
F.Port	Combined control and telemetry on one wire

Pros And Cons

Pros	Cons
Many older radios and receivers exist	Firmware compatibility can be confusing
Small receiver options	Usually not the first choice for new long-range builds
Betaflight support is mature	Telemetry setup is less simple than CRSF systems

Betaflight Connection

For SBUS, use an SBUS-capable pad or inverted UART input if the flight controller requires it.

Receiver SBUS -> Flight controller SBUS/RX pad
5V -> 5V
GND -> GND