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.
## SBUS
12 channels via serial currently supported.
## SUMD
16 channels via serial currently supported.
## SUMH
8 channels via serial currently supported.
### Configuration
See the Configuration document some some RX configuration examples.
For Serial RX enable `RX_SERIAL` and set the `serialrx_provider` cli setting as follows.
| Serial RX Provider | Value |
| ------------------ | ----- |
| SPEKTRUM1024 | 0 |
| SPEKTRUM2048 | 1 |
| SBUS | 2 |
| SUMD | 3 |
| SUMH | 4 |
#### PPM/PWM input filtering.
Hardware input filtering can be enabled if you are experiencing interference on the signal sent via your PWM/PPM RX.
Use the `input_filtering_mode` cli setting to select a mode.
| Value | Meaning |
| ----- | --------- |
| 0 | Disabled |
| 1 | Enabled |