From 3e4bf46f1eb36e10359c8c3cbbefd890a6ceed3c Mon Sep 17 00:00:00 2001
From: Dominic Clifton <me@dominicclifton.name>
Date: Wed, 7 Jan 2015 20:43:34 +0000
Subject: [PATCH] Updating the Rx documentation.

---
 docs/Rx.md | 100 +++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 74 insertions(+), 26 deletions(-)

diff --git a/docs/Rx.md b/docs/Rx.md
index d16d66b14a..d1baea5d12 100644
--- a/docs/Rx.md
+++ b/docs/Rx.md
@@ -1,44 +1,54 @@
 # Receivers (RX)
 
-## Parallel PWM
+A receiver is used to receive radio control signals from your transmitter and convert them into signals that the flight controller can understand.
+
+There are 3 basic types of receivers:
+
+Parallel PWM Receivers
+PPM Receivers
+Serial Receivers
+
+## Parallel PWM Receivers
 
 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 or CPPM)
+## PPM Receivers
+
+PPM is sometimes known as PPM SUM or CPPM.
 
 12 channels via a single input pin, not as accurate or jitter free as methods that use serial communications, but readily available.
 
-## MultiWii serial protocol (MSP)
+These receivers are reported working:
 
-Allows you to use MSP commands as the RC input.  Only 8 channel support to maintain compatibility with MSP.
+FrSky D4R-II
+http://www.frsky-rc.com/product/pro.php?pro_id=24
 
-## Spektrum
+Graupner GR24
+http://www.graupner.de/en/products/33512/product.aspx
+
+## Serial Receivers
+
+### Spektrum
 
 8 channels via serial currently supported.
 
-## S.BUS
+These receivers are reported working:
+
+Lemon Rx DSMX Compatible PPM 8-Channel Receiver + Lemon DSMX Compatible Satellite with Failsafe
+http://www.lemon-rx.com/shop/index.php?route=product/product&product_id=118
+
+
+### S.BUS
 
 16 channels via serial currently supported.
 
-## XBUS
+These receivers are reported working:
 
-The firmware currently supports the MODE B version of the XBus protocol.
-Make sure to set your TX to use "MODE B" for XBUS in the TX menus!
-See here for info on JR's XBUS protocol: http://www.jrpropo.com/english/propo/XBus/
+FrSky X4RSB 3/16ch Telemetry Receiver
+http://www.frsky-rc.com/product/pro.php?pro_id=135
 
-Tested hardware: JR XG14 + RG731BX with NAZE32 (rev4)
-With the current CLI configuration:
-```
-set serialrx_provider=5
-set serial_port_2_scenario=3
-feature RX_SERIAL
-```
-  
-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. 
-Please note that your config may vary depending on the Board used.
-
-### OpenTX configuration
+#### OpenTX S.BUS configuration
 
 If using OpenTX set the transmitter module to D16 mode and select CH1-16 on the transmitter before binding to allow reception
 of 16 channels. 
@@ -47,16 +57,54 @@ OpenTX 2.09, which is shipped on some Taranis X9D Plus transmitters, has a bug -
 The bug prevents use of all 16 channels.  Upgrade to the latest OpenTX version to allow correct reception of all 16 channels,
 without the fix you are limited to 8 channels regardless of the CH1-16/D16 settings.
 
-## SUMD
+
+### XBUS
+
+The firmware currently supports the MODE B version of the XBus protocol.
+Make sure to set your TX to use "MODE B" for XBUS in the TX menus!
+See here for info on JR's XBUS protocol: http://www.jrpropo.com/english/propo/XBus/
+
+These receivers are reported working:
+
+XG14 14ch DMSS System w/RG731BX XBus Receiver
+http://www.jramericas.com/233794/JRP00631/
+
+### SUMD
 
 16 channels via serial currently supported.
 
-## SUMH
+These receivers are reported working:
+
+GR-24 receiver HoTT
+http://www.graupner.de/en/products/33512/product.aspx
+
+Graupner receiver GR-12SH+ HoTT
+http://www.graupner.de/en/products/870ade17-ace8-427f-943b-657040579906/33565/product.aspx
+
+### SUMH
 
 8 channels via serial currently supported.
 
+SUMH is a legacy Graupner protocol.  Graupner have issued a firmware updates for many recivers that lets them use SUMD instead.
+
+## MultiWii serial protocol (MSP)
+
+Allows you to use MSP commands as the RC input.  Only 8 channel support to maintain compatibility with MSP.
  
-### Configuration
+## Configuration
+
+There are 3 features that control receiver mode:
+
+```
+RX_PPM
+RX_SERIAL
+RX_PARALLEL_PWM
+RX_MSP
+```
+
+Only one receiver feature can be enabled at a time.
+
+### Serial RX
 
 See the Configuration document some some RX configuration examples.
 
@@ -72,7 +120,7 @@ For Serial RX enable `RX_SERIAL` and set the `serialrx_provider` CLI setting as
 | XBUS_MODE_B        | 5     |
 
 
-#### PPM/PWM input filtering.
+### PPM/PWM input filtering.
 
 Hardware input filtering can be enabled if you are experiencing interference on the signal sent via your PWM/PPM RX.