atbetaflight/docs/Rx.md

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# Receivers (RX)
## Parallel PWM
8 channel support, 1 channel per input pin. On some platforms using parallel input will disable the use of serial ports
and softserial making it hard to use telemetry or gps features.
## PPM (PPM SUM)
12 channels via a single input pin, not as accurate or jitter free as methods that use serial communications.
## MultiWii serial protocol (MSP)
Allows you to use MSP commands as the RC input. Only 8 channel support to maintain compatibility with MSP.
## Spektrum
12 channels via serial currently supported.
## SUMD
8 channels supported currently, 12 or more is technically possible.
## SBUS
12 channels via serial supported currently.