DRAFT ONLY
Table of Contents
1 Introduction 4
1.1 Overview 4
1.2 Package Contents 5
1.3 Specifications 5
1.4 Software Updates 6
1.4.1 Changelog 6
1.4.2 Known Issues and Limitations 6
1.5 Product Support 6
1.6 Warnings and Safety 7
2 Software Installation 8
2.1 Minimum System Requirements 8
2.2 Obtaining the Latest Software / Firmware 8
2.3 Software Installation 9
2.4 Applying Firmware Updates 11
3 Configuration – DragonLink GUI 13
3.1 DragonLink Transmitter 13
3.1.1 General Settings 13
3.1.2 Channel Mixing / Assignment 15
3.1.3 Power Settings 16
3.1.4 RF Settings 17
3.1.5 Alarms and Sounds 18
3.1.6 Presets 20
3.1.7 External Connections 21
3.2.8 SD Logging 24
3.2.9 RSSI 25
3.2.10 Telemetry Info 26
3.2.11 Spectrum Analyzer 27
3.3 DragonLink Transmitter – Using Menu Button 28
3.3.1 Range Test 28
3.3.2 Bind Mode 29
3.3.3 Servo Test 29
3.3.4 Change Transmitter ID 30
3.3.5 Exit USB Telemetry Mode 30
3.3.6 Set Failsafe Channel Positions 30
3.4 DragonLink Receiver (via Transmitter) 31
3.4.1 RX Failsafe Behaviour 32
3.4.2 Channel Assignment (RX Outputs) 32
3.5 DragonLink Receiver 33
3.5.1 Receiver Outputs 34
3.5.2 General Settings 36
3.5.3 Radio Modem 37
3.5.4 GPS Settings 38
3.5.5 Log Information 39
3.5.6 RSSI 39
3.5.7 Spectrum Analyzer 40
3.5.8 Stabilization 41
4 Installation 42
4.1 DragonLink Transmitter 42
1 Introduction
1.1 Overview
The DragonLink V3 System has been constructed from the best performing, highest quality
components, using the latest and most advanced technology available. This system is built
to outperform everything else on market and will last for many years. It is not cheap, but it
will be the best FPV investment you will make.
Some of the DragonLink V3 features include:
Typical range of more than 60 KM with stock antennas
Full bi-directional telemetry - telemetry range varies with receiver type and data rate
used
Built in serial radio modem
Full MavLink support, works with Tower, Mission Planner, and others
Built in Bluetooth for display of telemetry on any android Smartphone or Tablet
Fully configurable using PC software
Can serve as a lost plane finder using optional GPS hardware and a telemetry-
compatible controller
Easy-to-see multi-color LEDs for instant status monitoring
Audible alarms (for low voltage, low RSSI, etc.)
Logging of flight, position, etc. to Micro-SD card (in development)
RF Spectrum Analyzer
Super-fast update rates available for racers and obstacle flyers
Hassle free, bind-and-fly operation for those that want a basic experience
Fully compatible with existing Dragon Link Micro Receivers (full bi-directional)
The Dragon Link complete system is proudly made in the USA, and is fully guaranteed in the
USA. The system includes everything you need for long range, high performance RC control,
and there is nothing additional to purchase. To get started with the best RC control money
can buy, just order a complete DragonLink system and choose the correct options for your
RC transmitter connection cables and airplane antenna options to suit.
NOTE: FPV video transmission is not a function of the DragonLink System and will
require the purchase of additional equipment.
1.2 Package Contents
“DragonLink V3 Advanced Complete System” package contents include:
1x Long Range V3 Advanced Slim Transmitter
1x Long Range Receiver (Micro or Advanced)
1x Genuine Nagoya Transmitter Antenna
1x High Performance FPVPro Receiver Antenna
1x Connection Cable for Transmitter Module (type included according to selection
made at time of purchase)
This user guide also covers the use of the following optional DragonLink products:
DragonLink Transmitter (non-slim)
DragonLink Advanced (high-power) Receiver
DragonLink 100 amp Current Sensor
DragonLink high-accuracy GPS position sensor
DragonLink Micro OSD
1.3 Specifications
DragonLink V3 Advanced Transmitter (Slim)
Input Voltage
5 – 18v (2 – 4 cell LiPo)
Operating Frequency
433MHz (frequency hopping in ARS band)
Typical Range
40km (using supplied antennas)
Weight
90g
Length
79mm
Width
60mm
Thickness
15mm
DragonLink V3 Advanced Transmitter
Input Voltage
5 – 18v (2 – 4 cell LiPo)
Operating Frequency
433MHz (frequency hopping in ARS band)
Typical Range
40km (using supplied antennas)
Weight
150g
Length
86mm
Width
75mm
Thickness
30mm
DragonLink V3 Micro Receiver
Input Voltage
5 – 9v (UBEC or 2 cell LiPo)
Operating Frequency
433MHz (frequency hopping in ARS band)
Transmit Power
25mW
Weight
g
Length
52mm (not inc. SMA)
Width
23mm
Thickness
9mm (14mm inc. pin headers)
DragonLink V3 Advanced (high-power) Receiver
Input Voltage
5 – 9v (UBEC or 2 cell LiPo)
Operating Frequency
433MHz (frequency hopping in ARS band)
Transmit Power
1500mW
Weight
g
Length
70mm (not inc. SMA)
Width
36mm
Thickness
11mm (14mm inc. pin headers)
1.4 Software Updates
For instructions on how to apply software or firmware updates, please see sections 2.3 and
2.4, respectively.
1.4.1 Changelog
An up-to-date changelog for both firmware and software can be found on the
welcome screen of the DragonLink GUI software.
This is version 1.0 of the DragonLink User Guide.
1.4.2 Known Issues and Limitations
When configuring “External connections” on the Transmitter, assigning the same
function to more than one connection will cause one or more of those
connections to not work.
When using MavLink Decoded telemetry, Mission Planner will endlessly attempt
to retrieve parameters. As this is not possible without a bi-directional telemetry
link, the user will need to click “Cancel” to proceed. This is a limitation of Mission
Planner and not a fault with your DragonLink system.
Elements positioned on the DragonLink OSD within the GUI will not always show
the correct location on the FPV video feed. The OSD is still largely under
development.
1.5 Product Support
Your Dragon Link system is fully guaranteed and we will be happy to repair, test and
upgrade it to the latest firmware free of charge. If you have exhausted the troubleshooting
procedures in section [to be added] at the end of this manual and still have no success
getting your DragonLink system to work, send your transmitter and receiver ONLY (NO
antennas, NO accessories or other items) to us for repair. It is VERY IMPORTANT that you
include a note explaining what is wrong so that we can correctly diagnose your system. Also
remember to include your full name and return address on the note so that it can be sent
back to you.
If you are outside the USA, you can use the cheapest way possible to send it to us in a small
padded envelope, or very small box to keep the postage cost low. The mail is very reliable
and fast in the USA so there is no need to pay extra for express mail, or very expensive
tracking.
Shipping address:
ROSA YSLA
PO BOX 388
CORTARO AZ 85652
USA
Support contact:
support@fpvpro.com
1.6 Warnings and Safety
The DragonLink system is for hobby use only, in radio-controlled planes, copters,
boats, and cars. Use of the system for any other than its intended purpose may
cause damage to property, personal injury, or death.
Always observe proper use of the DragonLink system and ensure that all appropriate
safety measures are taken during use and when setting up (eg. when soldering), in
accordance with the user manuals for any other applicable products.
Always observe safety precautions for Lithium Polymer and other battery types.
Improper use of batteries can cause fires, serious burns, and explosions. Never use
or charge a damage or puffed battery.
Always observe local and national laws regarding the use of radio transmitters and
remotely piloted vehicles.
DragonLink and FPVPro will not accept any liability for any loss, fines, or damage that
may result from the use of this system.
2 Software Installation
This chapter outlines the procedures for installing the DragonLink GUI onto a Microsoft
Windows PC and then using the DragonLink GUI to load the latest firmware onto your
DragonLink hardware.
2.1 Minimum System Requirements
Component
Requirement
Computer / Processor
Pentium 4, Athlon 64, or equivalent
Memory (RAM)
2 gigabytes (GB) or greater
Operating System
Microsoft™ Windows™ 7, 8, 8.1, 10
Video
Display with resolution 1024x768 or greater
Internet Connectivity
256kbit/s or faster recommended
2.2 Obtaining the Latest Software / Firmware
It is strongly advisable to check for firmware and software updates regularly as they may
include bug fixes, new features, and performance improvements. Before flying your
DragonLink system for the first time, it is necessary to apply the latest firmware and obtain
the newest version of the DragonLink GUI software for PC.
1. To begin checking for updates, visit this section of the DragonLink website:
http://www.dragonlinkrc.com/instructions/
2. From there, select your applicable DragonLink system:
3. Then select Complete Systems:
4. Lastly, click on the download link near the top:
5. Once the compressed (.zip) has downloaded, extract it by right-clicking the file and
selecting Extract All…
2.3 Software Installation
1. The compressed (.zip) file obtained from the DragonLink website contains the following
files:
NOTE: You will require an internet connection in order to perform the installation
as the installer needs to download additional software components.
2. Double-click the DragonLink_GUI_Setup.exe file to begin the installation of the
DragonLink software. At the prompt, select “Install”.
3. Please wait for the download to complete.
4. Once the installation is complete, the software can be launched from the DragonLink
shortcut on the Start Menu.
2.4 Applying Firmware Updates
Firmware updates can be easily applied to your DragonLink transmitter, receiver, or OSD,
using the DragonLink GUI software.
WARNING: It is important not to interrupt the firmware update process as this
has the potential to cause hardware damage and render your device unusable.
1. First, connect your DragonLink transmitter, receiver, or OSD to your PC using a micro-
USB cable. Ensure the device tab appears in the DragonLink GUI software. It may take a
moment for drivers to install before the tab appears. If it does not appear, please follow
the Driver Installation Troubleshooting guide in section [to be added].
2. Select the relevant tab for the device you wish to update. Then, select the Update page
and click Reboot Hardware in firmware update mode
3. Once the hardware has rebooted you will be presented with the below screen, which
offers a number of firmware options.
-Select “latest beta firmware” if you wish to try out the most up-to-date features
and / or bug fixes.
-Select “latest Stable firmware” if you wish to use the most up-to-date firmware
that is known not to have any major bugs.
-Select “Select and upload file” if you wish to manually specify a firmware file to
upload to your device. (This is used in such instances as when you may wish to
downgrade to a previous version of firmware.)
After selecting one of the options, the software will automatically download the firmware
from the internet (or allow you to navigate to the firmware file and select it), then begin
applying it to your DragonLink device.
NOTE: While every precaution is taken to prevent serious bugs making it into any
version of our firmware, it is possible that ‘beta’ firmware may contain bugs
which have the potential to cause the loss of control of your model aircraft. At the
time of writing, no such bugs are known to exist, however please proceed with
the appropriate level of care as DragonLink cannot accept any responsibility for
any damages or the loss of your model aircraft.
3 Configuration – DragonLink GUI
NOTE: After changing settings relating to update-rate, bandwidth allocation, use
of narrow-band, no. of channels, hardware IDs, or the enabling or disabling bidirectional data, it will be necessary to re-bind your DragonLink transmitter and
receiver.
Saving Settings
Before disconnecting or rebooting your DragonLink device, ensure that any changes to the
configuration are not lost by clicking Save Settings at the bottom of the DragonLink GUI
window. Some pages have additional save buttons – ensure you click these as necessary.
3.1 DragonLink Transmitter
3.1.1 General Settings
ID: This number should be changed to something unique before your DragonLink
system is used for the first time. It is used as an identifier to encode the transmission
data so the receiver does not suffer interference from other DragonLink systems
during flight. Once changed, re-binding with the receiver is necessary.
Firmware version: This field displays the version of firmware currently applied to the
DragonLink transmitter.
Input 1: Specifies the protocol used by the controller to talk to the DragonLink
transmitter. This must match the protocol used by the controller’s trainer jack or
module-bay port.
Use model memory: Enables the use of model memory, which allows switching
between 3 different saved configuration ‘profiles’ so that the settings do not need to
be adjusted manually each time for use with different model aircraft.
When enabled, the desired model can be selected by setting the switch position
before powering on the transmitter (Switch Ex3 on large transmitter, or switch Ex1
on the Slim). Once the transmitter is powered on, the switch can then be used
normally for other functions without affecting the model selection.
Reboot TX: reboots the DragonLink transmitter. Required for some changes to take
effect.
Reset TX to factory settings: Restores all settings back to factory default. A
recommended first-step when troubleshooting the DragonLink system.
Bind: Places the DragonLink transmitter in binding mode. To complete the binding
process once this mode has been activated:
1 Power on the DragonLink receiver. The receiver’s blue and green LEDs should
flash alternately, indicating a successful bind.
2 Power off the receiver and reboot the transmitter.
3 The receiver’s blue LED should now be lit, indicating a successful link to the
DragonLink transmitter. The transmitter’s LED(s) will not be lit unless connected
to an external power source.
Load Model 1 – 3: These buttons switch between saved model configurations.
Before changing to another Model, ensure settings are saved as any unsaved
changes will be lost.
3.1.2 Channel Mixing / Assignment
The Channel Mixing settings page allows you to map channels from your controller,
as well as the DragonLink transmitter’s switches or the rotary pot (large transmitter
only), to any of the 12 channels on the DragonLink system. In addition, the sliders to
the right of each channel show the position of each channel, live, so you can confirm
their functionality without needing the receiver or additional hardware connected.
CH 1 – 12: The drop-down menus on this screen allow you to assign an input to each
of the 12 channels that the DragonLink transmitter communicates to the receiver.
The available options for each channel include:
Channels 1 – 12 from Input 1
Channels 1 – 12 from Input 2*
Switch 1 (Ex1)
Switch 2 (Ex3)*
Rotary pot (Ex2)*
Voltage
*not available on DragonLink V3 Slim transmitter
NOTE: Configuration of the receiver is also required in order to complete
the channel mapping / mixing setup. See chapter 3.5.
Assigning voltage to a channel will cause that channel’s position to move in
conjunction with the DragonLink transmitter’s input voltage. This could, for example,
be used by the model aircraft to display an indication on the OSD of the transmitter’s
voltage, or for an RTL mode to be set based on low TX voltage, or for a physical servo
to perform some function once the TX battery reaches a certain level.
The channel will move from minimum to maximum positions based on a voltage
range of approximately 5v – 16v.
3.1.3 Power Settings
The DragonLink transmitter’s RF output power can be controlled automatically or set
to a fixed milli-watt value manually by the user.
NOTE: Auto mode increases the RF power as-needed in order to maintain
a stable RC link and reduces it when not needed to maintain efficiency. It
does so very quickly – far quicker than the user could adjust it manually –
and in much finer increments. For this reason, Auto is the recommended
mode.
Low: sets the transmit power level when the switch, RC channel, or rotary pot is in
the lower third of the channel range
Mid: sets the transmit power level when the switch, RC channel, or rotary pot is in
the middle third of the channel range
High: sets the transmit power level when the switch, RC channel, or rotary pot is in
the upper third of the channel range
Power switch: Defines the switch, RC channel, or rotary pot that will be used to alter
the transmit power.
At the time of writing, there is no option to remove the assignment of a switch or RC
channel to the power setting, however, if the low, mid, and high settings are all set
to Auto (or an identical fixed value), the settings on this page will have no effect. In
addition, the assignment of a switch or channel here will not prevent it from being
assigned to other functions elsewhere.
3.1.4 RF Settings
The RF settings page controls how the DragonLink transmitter talks to the receiver.
Changing these settings can affect the control range and telemetry range, as well as
the responsiveness of control over the model aircraft. For example, lowering the
number of channels sent to the receiver will improve the responsiveness, while
decreasing the bi-directional bandwidth and lowering the update rate to its
minimum setting will greatly increase the range at which telemetry can be received.
At the bottom of the page, the approximate update rate (hertz) is displayed, along
with the radio modem’s uplink and downlink data rates (bytes per second). These
values can be used to gauge the effect that changing the settings will have.
In real-world usage situations, any gain to be had by lowering the number of
transmitted channels or bi-dir bandwidth will be marginal, and may result in
compromised performance. Only lower these settings below ‘normal’ in cases where
extreme range and link stability are required.
NOTE: MavLink telemetry streams require a relatively high data rate.
Without altering the configuration of the flight controller, MavLink
typically only works with ‘bidir bandwidth’ set to ‘High’ and ‘RF
preference’ set to ‘Fastest update-rate’.
RF Band: [to be added]
Use bi-dir: Enables or disables bi-directional communication between the
transmitter and receiver. Disabling this setting will disable all telemetry and radiomodem functionality.
Trans. channels: Specifies how many channels to transmit to the receiver.
Bidir bandwidth: Specifies how much bandwidth to allocate to bi-directional
communication. Maximum value is required for stable MavLink.
RF preference: Specifies how rapidly to update the channel positions.
Use narrowband: Effectively uses half the normal bandwidth, allowing much tighter
internal RF filters for a cleaner signal.
3.1.5 Alarms and Sounds
The DragonLink transmitter is capable of providing a range of audible warnings to the
user.
Missing PPM: Triggered by a loss of input from the radio controller’s trainer jack or
module bay connection.
Low TX voltage: User-configurable low input-voltage alarm.
Low flight voltage: Triggered by low voltage reading from optional DragonLink Voltage
Sensor (requires active telemetry link).
Low RX RSSI: User-configurable low signal strength alarm.
Change power level: Either one, two, or three beeps will be played to correspond
with the selection of either low, mid, or high power levels, respectively. When using
Auto power level modes only, disabling this alert is recommended (see section
4.1.3).
Micro Power mode*: Plays a repeating audio reminder while the transmitter is in
micro power (range test) mode.
Servo test mode*: Plays a repeating audio reminder while the transmitter is in servo
test mode.
Bind mode*: Plays a repeating audio reminder while the transmitter is in bind mode.
* It is recommended that these reminders be enabled to ensure the model aircraft is
not inadvertently launched while the transmitter remains in a mode that may cause
loss of control or damage.
3.1.6 Presets
The Presets page can be used to apply a range of configuration templates to your
DragonLink transmitter. These won’t alter general settings, such as channel and
switch assignments, model ID, or alarms, however it will alter settings to do with bidirectional data, update rate, and bandwidth in order to optimise performance for
the use-case determined by the preset. After applying a preset, it will be necessary
to check all of the settings to confirm they are suitable.
3.1.7 External Connections
The External Connections page is used to assign functions to the physical and
wireless connections on the DragonLink transmitter.
NOTE: Chapters [to be added] contain instructions and example
configurations for using your DragonLink transmitter to send telemetry
for some of the more common flight controller and ground-station
setups.
Bluetooth (on supported models): Sets the type of data that will be streamed to the
Bluetooth virtual COM port.
Option
Function
Bi-directional
Radio modem
Passes raw serial data directly to and from the
connected device.
Yes
DragonLink Mavlink
Encodes non-MavLink telemetry from the aircraft
into a MavLink-compatible telemetry stream for use
with ground stations.
No
Auto-detect RX idle: When enabled, the DragonLink transmitter looks for data (eg.
MavLink heartbeats) coming from the device connected by bluetooth. If the
upstream data stops (ie. the bluetooth device is disconnected), downstream
telemetry data is no longer sent to the bluetooth connection. This setting is designed
to prevent overflow of the bluetooth module’s buffer which occurs when data is sent
to the module and no device is connected to receive it. When this happens,
bluetooth will not work until the DragonLink transmitter has been power-cycled
(reset).
In order to use receive-only telemetry (ie. with a device that does not send MavLink
heartbeats) this setting should be disabled. In this state, the user should be aware
that disconnecting the bluetooth device while the telemetry stream is active will
cause the module to crash and require reset of the DragonLink transmitter.
NOTE: This issue does not affect newer Slim transmitters with an
updated bluetooth module and thus, this setting has no effect.
Expansion con: Sets the type of data that will be streamed to the UEXP port on the
base of the transmitter.
Option
Function
Bi-directional
Radio modem
Passes raw serial data directly to and from the
connected device.
Yes
DragonLink Mavlink
Encodes non-MavLink telemetry from the aircraft
into a MavLink-compatible telemetry stream for use
with ground stations.
No
Taranis telemetry
Encodes either MavLink or non-MavLink telemetry
data into an S.Port telemetry stream for use with a
FrSky Taranis controller
No
Baud rate: Sets the serial baud rate of the UEXP expansion connector.
USB Function: Sets the type of data that will be streamed to the USB virtual COM
port.
WARNING: Changing the USB function setting will prevent the
DragonLink GUI from being able to connect to the transmitter for
configuration purposes. See section 3.3.5 for instructions on how to
change this setting back to the default.
Option
Function
Bi-directional
Radio
modem
Passes raw serial data directly to and from the
connected device.
Yes
DragonLink
Mavlink
Encodes non-MavLink telemetry from the aircraft
into a MavLink-compatible telemetry stream for use
with ground stations.
No
GUI config
Allows the connected device to configure the
transmitter using the DragonLink GUI
N/A
NOTE: Baud rates do not apply to the USB virtual COM port. As long as
the baud rate is correct on the receiver, and the receiving software
matches that setting, the data will parse successfully.
Enable MavLink decoding: This setting enables decoding of an incoming MavLink
telemetry stream so that certain sensor values can be passed to external, nonMavLink devices.
3.2.8 SD Logging
This page allows you to see diagnostic information regarding the logs that have been
saved to the SD card (not included). At the time of writing, support for logging is still
in development.
3.2.9 RSSI
On this page, the RSSI (received signal strength indication) is displayed in live graph
view, along with the transmitter input voltage. This indication of RSSI represents the
strength of the telemetry signal sent from the receiver to the transmitter, and not
the strength of the RC signal sent from the transmitter to your model aircraft.
3.2.10 Telemetry Info
When a compatible GPS, voltage sensor, or OSD are connected to the DragonLink
receiver and the pin assignments are correctly configured, or when MavLink Decode
is used to capture telemetry from a valid MavLink stream, the incoming telemetry
data will be visible on this tab for diagnostic purposes.
3.2.11 Spectrum Analyzer
The spectrum analyzer can be used to assess the RF spectrum to look for any
unexpected radio interference prior to flight or to diagnose the cause of any radio
interference from other components on your model aircraft. The example
screenshot above shows an RF noise floor (the signal strength of average background
noise) of approximately -120dBm across the 433mHz band (427 – 437mHz), which is
ideal.
It is normal to see a spike on the spectrum analyzer when your DragonLink receiver
is powered on and within range.
WARNING: A noise floor significantly higher than -110dBm indicates a
potential issue that may result in reduced range and loss of control over
your aircraft, so should be investigated and resolved prior to flying.
3.3 DragonLink Transmitter – Using Menu Button
The DragonLink transmitter allows for certain functions to be performed using the Menu
button on top of the unit.
3.3.1 Range Test
Conducting a range test before each flight is an important step in ensuring that there
are no faults, interference, or misconfigurations that could result in the loss of your
model aircraft. In range test mode, the RF transmit power is greatly reduced to
simulate the effects of extreme range. Range tests should be conducted on-location,
with a clear line-of-sight and with environmental conditions matching those of the
planned flight.
To conduct a range test:
1. Hold down the Menu button on the DragonLink transmitter and turn on the
power.
2. After the power-on sound is played, the LED(s) will turn green accompanied by 1
beep.
3. Release the Menu button.
4. The transmitter will continue to play 1 beep (if the range test mode alarm is
enabled) and the LED(s) will flash green to indicate it is in range test mode.
5. Position the transmitter with the antenna vertical.
6. Carry the model aircraft away from the transmitter, ensuring that the receiving
antenna is also kept in its flight orientation, and monitor the blue LED on the
receiver.
7. The receiver’s blue LED turning off indicates a temporary loss of signal from the
transmitter. Brief flickers are normal during operation even at close range. Once
the LED is in an off state approximately 50% of the time, measure the distance
from the transmitter to the model aircraft.
8. To exit range test mode, press the menu button.
In normal conditions, the range test should yield a distance of approximately 10
metres, or 30 feet. 5 metres, or 15 feet, is acceptable for shorter range craft that will
operate up to a maximum distance of 5km.
3.3.2 Bind Mode
It is possible to bind the transmitter to the receiver without using the DragonLink
GUI. To do so,
1. Ensure the receiver is powered off.
2. Hold down the Menu button on the DragonLink transmitter and turn on the
power.
1. After the power-on sound is played, continue to hold the menu button until the
LED(s) on the transmitter turn blue accompanied by 2 beeps.
2. Release the Menu button.
3. The transmitter will continue to play 2 beeps (if the bind mode alarm is enabled)
and the LED(s) will flash blue to indicate it is in binding mode.
4. Power on the receiver.
5. The receiver’s blue and green LEDs should both begin flashing to indicate a
successful bind.
6. Power off both the receiver and the transmitter to save the binding.
3.3.3 Servo Test
In servo test mode, the DragonLink transmitter will continuously sweep all channels
back and forth from minimum to maximum positions.
1. Hold down the Menu button on the DragonLink transmitter and turn on the
power.
2. After the power-on sound is played, continue to hold the menu button until the
LED(s) on the transmitter turn yellow accompanied by 3 beeps.
3. Release the Menu button.
4. The transmitter will continue to play 3 beeps (if the servo test mode alarm is
enabled) and the LED(s) will flash yellow to indicate it is in servo test mode.
5. To exit servo test mode, press the menu button.
3.3.4 Change Transmitter ID
Before operating the DragonLink system for the first time, the transmitter ID must be
changed as not doing so presents the possibility of interference if another system
with the default ID is used within range.
1. Hold down the Menu button on the DragonLink transmitter and turn on the
power.
2. After the power-on sound is played, continue to hold the menu button until the
LED(s) on the transmitter turn red accompanied by 4 beeps.
3. Release the Menu button.
4. The transmitter’s LED(s) will flash red to indicate the ID has been changed.
5. To exit ID change mode, you will need to power-cycle the transmitter.
NOTE: You will need to re-bind your receiver(s) after changing the
transmitter ID.
3.3.5 Exit USB Telemetry Mode
After changing the USB function setting on the DragonLink transmitter, it will no
longer be possible to configure the transmitter using the USB port and GUI software.
To restore the default USB mode:
1. Hold down the Menu button on the DragonLink transmitter and turn on the
power.
2. After the power-on sound is played, continue to hold the menu button until the
LED(s) on the transmitter turn white accompanied by 5 beeps.
3. Release the Menu button.
4. The transmitter will play the power up sound and the LED(s) will flash white to
indicate the USB mode has been changed.
5. Power-cycle the transmitter for the change to take effect.
3.3.6 Set Failsafe Channel Positions
When the Normal failsafe mode is applied to the DragonLink receiver, it will move all
of the channels to a pre-configured position upon loss of signal.
1. With the DragonLink transmitter and receiver powered on, check that both the
transmitter and receiver are displaying blue LEDs to indicate an active link.
2. Press and hold the Menu button until 1 beep is heard and the LED(s)
momentarily turn blue-green.
3. The position of all sticks, switches, and rotary pots should now be saved to the
receiver.
WARNING: Prior to setting the failsafe channel positions, ensure the
position of any mode switches, such as “arm” or “return-to-home” are in
the position you wish them to remain should the R/C link be lost.
3.4 DragonLink Receiver (via Transmitter)
The DragonLink receiver can be configured using the GUI (to a limited extent) while the
DragonLink transmitter is connected to the PC and the receiver is powered on.
At this time, it is not possible to configure the PPM / SBUS output, the UEXP port, or to
select certain other RX pin assignments through this page. For those items, the PC will need
to be directly connected to the receiver.
If the fields on this page are blank, settings can be retrieved from the receiver using the
“Update info” button. If this does not work, ensure the receiver is powered on and has been
bound to the transmitter.
NOTE: Ensure settings are saved on this page using the dedicated “Save settings”
button.
3.4.1 RX Failsafe Behaviour
See section 3.5.1 – Receiver Outputs – subheading Failsafe.
3.4.2 Channel Assignment (RX Outputs)
CH1 – X: These drop-down menus allow the assignment of a function to each of the
physical pins on the DragonLink receiver.
NOTE: Analogue RSSI is only selectable on CH8 of the Micro receiver. On
the Advanced (high-power) receiver, there is a dedicated set of pins (CH
13) for this function.
3.5 DragonLink Receiver
The first time you connect your DragonLink receiver to the DragonLink GUI, you may be
prompted to set the receiver type. Ensure that you select this correctly as an incorrect
selection may result in unusable channels.
3.5.1 Receiver Outputs
Failsafe:
The failsafe setting determines how the receiver behaves during fail-safe (loss of
signal from the DragonLink transmitter).
Normal: The receiver’s outputs (PPM / SBUS / PWM) remain active and the channels
(sticks, switches, etc.) positions will move to saved positions set by the user during
failsafe configuration. See section 3.3.6 for instructions on setting up and saving
these channel positions.
No output: The receiver’s outputs (PPM / SBUS / PWM) outputs will deactivate when
a fail-safe occurs.
WARNING: If using Digital RSSI, that value will also no longer be updated
until the signal from the transmitter is re-acquired.
Keep position: All channels will hold their last-known position until signal is reacquired.
WARNING: Where applicable, if using Keep position you may need to
ensure that your flight controller is correctly configured to monitor the
DragonLink receiver’s RSSI value in order for it to correctly identify when
a fail-safe event has occurred.
Receiver outputs: The Receiver outputs section allows you to assign functions to
each of the pin headers on your DragonLink receiver. Pictured below is the
configuration page for the Micro receiver, which has 8 multifunction pin headers. In
the example below, channel 8 (CH 8) has been assigned to output S-BUS, while the
remaining 7 channels output a standard single-channel PWM signal.
NOTE: Analog RSSI is only selectable on channel 8 (micro RX) or channel
13 (advanced RX).
NOTE: For use with MavLink data, it is possible to select the “Serial in”
and “Serial out” channel assignments (for bi-directional telemetry and
mission planning) or the “MavLink Decode” assignment (for decoded
telemetry only – provides maximum range). The MavLink Decode
assignment functions as a Serial input from the flight controller only – no
output is required as it is not bi-directional.
An additional 4 channels are visible in the GUI when connected to an Advanced
receiver.
PPM/S-bus out: These drop-down menus allow you to assign channels to the PPM or
S-BUS stream and select the number of channels to include. The maximum number
of channels for either protocol is 12.
UEXP con pin3/4: These connectors can also be assigned various functions, including
S-BUS, PPM, GPS input, Serial communications and OSD data for the DragonLink
OSD.
NOTE: Some S-BUS devices require a signal with inverted logic. For these
devices, select S-BUS inv.
3.5.2 General Settings
ID: Displays the Transmitter ID (previously set by you) that the receiver is currently
bound to.
Firmware version: Displays the version of currently applied firmware.
Volt Cal Calue: This value allows calibration of the DragonLink Voltage Sensor (sold
separately). If you measure the voltage of your flight battery and discover it to be
incorrect, this value, which is a percentage of the sensed voltage, can be adjusted to
correct it.
Rf Band: Displays the selected RF Band as set on the transmitter prior to binding.
Hardware ID: This setting tells the receiver which type of receiver it is and as such it
should never need to be changed. This configuration is needed internally for the
firmware to handle pin assignments and configuration. This is normally set once
when first connected to a PC, however it can be changed here if it is inadvertently
set incorrectly.
Set hardware ID: Confirms the change to the above setting.
Reset hardware to Factory Settings: Restores all of the configuration to factory
default settings.
3.5.3 Radio Modem
Input / output baud rate (on receiver): Specifies the baud rate for the Receiver to
use for serial radio modem communication. This must match the baud rate set for
the device(s) attached to the Receiver and on the receiving ground station. It must
also match the Transmitter’s UEXP baud rate, if that connection is to be used on the
receiving end.
Set baud: Saves changes to the above setting.
Get Status: Displays in the text box the current bytes-per-second average being sent
via the radio modem.
MavLink decoding: Enables decoding of a MavLink telemetry stream being sent via
the radio modem. This function converts certain telemetry data to DragonLink’s
proprietary telemetry format which supports significantly greater range and
robustness of data. Please see chapters [to be added] which contain detailed
instructions for correctly applying this setting.
3.5.4 GPS Settings
A GPS receiver can be directly connected to the DragonLink Receiver for telemetry
purposes. You will need to know the baud rate for the GPS receiver attached
receiver, which is set using the drop-down menu and saved by clicking Save GPS
Baud rate.
Live data on, Live data off: Toggles the display of live data sent by the attached GPS,
as well as data from any attached MavLink telemetry stream.
3.5.5 Log Information
The Log Information page is used to store certain flight data regarding channel
positions, RF transmit power, GPS and telemetry data, and link state. This can be
enabled, disabled, deleted, and retrieved using the controls on this page.
3.5.6 RSSI
The RSSI page displays a graph of the current signal strength for the radio control
link. This can be used for troubleshooting or testing. In addition, the voltage supplied
to the Receiver is super-imposed on the graph in orange.
3.5.7 Spectrum Analyzer
This feature is identical to the feature of the same name found in the Transmitter
configuration pages. Please see chapter 3.2.11 for further information.
3.5.8 Stabilization
[to be added]
4 Installation
Warning: Always observe correct polarity when making electrical connections.
Reversed polarity or incorrect wiring may result in damage to your DragonLink or
third-party equipment.
4.1 DragonLink Transmitter
The DragonLink Slim transmitter includes quality hook-and-loop pads with self-adhesive
backing, which can be used to fix your transmitter to the back of your controller, as per the
below image. If this method is not suited to your controller, other mounting hardware may
be required (not included).
Connection to Trainer Port
The trainer port is the output on your controller which sends the positions of the channels
to the DragonLink Transmitter. On most controllers, this also provides power to the
DragonLink Transmitter.
RF Module pins
The Taranis, Turnigy 9x, and other RC transmitters with a removable RF module can be
connected using the RF module Pins. This is generally the simplest method of connection as
the RF module pins supply both power and signal to the DragonLink transmitter. If the "RF
Module cable" option was selected at the time of purchase, you should have received the
cable with one end having a plug matching the picture below. This can be connected directly
onto the RF module pins as shown. Ensure the cable is not connected to the module bay
pins in reverse.
3.5mm Jack Connector
This is the most common type of connection for Spektrum, JR, Walkera, Hitech, and other
brands of RC controllers. Two connections are required for the DragonLink Transmitter
when using this type of cable:
PPM input from your RC Transmitter. This is provided using the 3.5mm jack.
- 18 volts. This is provided using the red connector.
Futaba Square Trainer Port
The Futaba square trainer cable will supply both signal and power to the DragonLink
Transmitter, and cannot be connected with incorrect polarity.
DragonLink Transmitter
Once connected to your controller, the other end of the cable can be connected to the
DragonLink Transmitter if not already done so. This should be connected to Input 1.
Note that on the Large DragonLink Transmitter that Input 2 does not supply
power to the unit.
Configuration
The controller must be configured to output a signal matching one of the selectable options
found in chapter 3.1.1.
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