Updating the Rx documentation.
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Dominic Clifton
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docs/Rx.md
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docs/Rx.md
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# Receivers (RX)
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## Parallel PWM
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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 (PPM SUM or CPPM)
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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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## MultiWii serial protocol (MSP)
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These receivers are reported working:
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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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FrSky D4R-II
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http://www.frsky-rc.com/product/pro.php?pro_id=24
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## Spektrum
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Graupner GR24
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http://www.graupner.de/en/products/33512/product.aspx
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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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## S.BUS
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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.
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## XBUS
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These receivers are reported working:
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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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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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Tested hardware: JR XG14 + RG731BX with NAZE32 (rev4)
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With the current CLI configuration:
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```
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set serialrx_provider=5
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set serial_port_2_scenario=3
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feature RX_SERIAL
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```
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This will set the controller to use serial RX, with XBUS_MODE_B as provider and finally the scenario to be used for serial port 2.
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Please note that your config may vary depending on the Board used.
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### OpenTX configuration
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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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@ -47,16 +57,54 @@ OpenTX 2.09, which is shipped on some Taranis X9D Plus transmitters, has a bug -
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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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## SUMD
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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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## SUMH
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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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### Configuration
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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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@ -72,7 +120,7 @@ For Serial RX enable `RX_SERIAL` and set the `serialrx_provider` CLI setting as
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| XBUS_MODE_B | 5 |
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#### PPM/PWM input filtering.
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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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