144 lines
4.4 KiB
Markdown
144 lines
4.4 KiB
Markdown
# Receivers (RX)
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A receiver is used to receive radio control signals from your transmitter and convert them into signals that the flight controller can understand.
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There are 3 basic types of receivers:
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Parallel PWM Receivers
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PPM Receivers
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Serial Receivers
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## Parallel PWM Receivers
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8 channel support, 1 channel per input pin. On some platforms using parallel input will disable the use of serial ports
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and SoftSerial making it hard to use telemetry or GPS features.
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## PPM Receivers
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PPM is sometimes known as PPM SUM or CPPM.
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12 channels via a single input pin, not as accurate or jitter free as methods that use serial communications, but readily available.
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These receivers are reported working:
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FrSky D4R-II
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http://www.frsky-rc.com/product/pro.php?pro_id=24
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Graupner GR24
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http://www.graupner.de/en/products/33512/product.aspx
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R615X Spektrum/JR DSM2/DSMX Compatible 6Ch 2.4GHz Receiver w/CPPM
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http://orangerx.com/2014/05/20/r615x-spektrumjr-dsm2dsmx-compatible-6ch-2-4ghz-receiver-wcppm-2/
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FrSky D8R-XP 8ch telemetry receiver, or CPPM and RSSI enabled receiver
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http://www.frsky-rc.com/product/pro.php?pro_id=21
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## Serial Receivers
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### Spektrum
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8 channels via serial currently supported.
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These receivers are reported working:
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Lemon Rx DSMX Compatible PPM 8-Channel Receiver + Lemon DSMX Compatible Satellite with Failsafe
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http://www.lemon-rx.com/shop/index.php?route=product/product&product_id=118
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### S.BUS
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16 channels via serial currently supported. See the Serial chapter in the documentation for a configuration example.
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* In most cases you will need an inverter between the receiver output and the flight controller hardware.
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* Softserial ports cannot be used with SBUS because it runs at too high of a bitrate (1Mbps). Refer to the chapter specific to your board to determine which port(s) may be used.
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* You will need to configure the channel mapping in the GUI (Receiver tab) or CLI (`map` command).
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These receivers are reported working:
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FrSky X4RSB 3/16ch Telemetry Receiver
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http://www.frsky-rc.com/product/pro.php?pro_id=135
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#### OpenTX S.BUS configuration
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If using OpenTX set the transmitter module to D16 mode and select CH1-16 on the transmitter before binding to allow reception
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of 16 channels.
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OpenTX 2.09, which is shipped on some Taranis X9D Plus transmitters, has a bug - [issue:1701](https://github.com/opentx/opentx/issues/1701).
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The bug prevents use of all 16 channels. Upgrade to the latest OpenTX version to allow correct reception of all 16 channels,
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without the fix you are limited to 8 channels regardless of the CH1-16/D16 settings.
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### XBUS
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The firmware currently supports the MODE B version of the XBus protocol.
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Make sure to set your TX to use "MODE B" for XBUS in the TX menus!
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See here for info on JR's XBUS protocol: http://www.jrpropo.com/english/propo/XBus/
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These receivers are reported working:
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XG14 14ch DMSS System w/RG731BX XBus Receiver
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http://www.jramericas.com/233794/JRP00631/
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### SUMD
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16 channels via serial currently supported.
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These receivers are reported working:
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GR-24 receiver HoTT
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http://www.graupner.de/en/products/33512/product.aspx
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Graupner receiver GR-12SH+ HoTT
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http://www.graupner.de/en/products/870ade17-ace8-427f-943b-657040579906/33565/product.aspx
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### SUMH
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8 channels via serial currently supported.
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SUMH is a legacy Graupner protocol. Graupner have issued a firmware updates for many recivers that lets them use SUMD instead.
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## MultiWii serial protocol (MSP)
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Allows you to use MSP commands as the RC input. Only 8 channel support to maintain compatibility with MSP.
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## Configuration
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There are 3 features that control receiver mode:
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```
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RX_PPM
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RX_SERIAL
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RX_PARALLEL_PWM
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RX_MSP
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```
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Only one receiver feature can be enabled at a time.
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### Serial RX
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See the Configuration document some some RX configuration examples.
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For Serial RX enable `RX_SERIAL` and set the `serialrx_provider` CLI setting as follows.
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| Serial RX Provider | Value |
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| ------------------ | ----- |
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| SPEKTRUM1024 | 0 |
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| SPEKTRUM2048 | 1 |
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| SBUS | 2 |
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| SUMD | 3 |
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| SUMH | 4 |
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| XBUS_MODE_B | 5 |
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### PPM/PWM input filtering.
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Hardware input filtering can be enabled if you are experiencing interference on the signal sent via your PWM/PPM RX.
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Use the `input_filtering_mode` CLI setting to select a mode.
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| Value | Meaning |
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| ----- | --------- |
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| 0 | Disabled |
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| 1 | Enabled |
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