JETI model Duplex REX12A User manual

COMPLEX RADIO CONTROL SYSTEMCOMPLEX RADIO CONTROL SYSTEM
®
COMPLEX RADIO CONTROL SYSTEM
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User manualUser manualUser manual
EN
REX Assist
receivers
02/2023

COMPLEX RADIO CONTROL SYSTEM

COMPLEX RADIO CONTROL SYSTEM
3. Installation ........................................................................................... 05
1. Introduction......................................................................................... 01
3.1 Installation in the model ........................................................... 05
2. Technical data ...................................................................................... 02
3.2 Power supply ................................................................................ 07
2.1 Technical data ............................................................................. 03
3.3 Operation ..................................................................................... 08
3.4 Binding .......................................................................................... 08
3.5 Range test .................................................................................... 09
4. Quick setup ........................................................................................... 10
4.1 Airplane ....................................................................................... 10
2.2 Important Notices ...................................................................... 03
Content:
4.1.2 Choice of flight modes ...................................................... 14
4.2.2 Choice of flight modes ...................................................... 25
4.3 Description of flight modes ...................................................... 25
4.3.1 Manual (Assist Off): Airplanes ........................................ 25
4.2 Multicopter ................................................................................... 16
4.2.1 Optimise multicopter settings ........................................ 22
4.1.1 Airplane model settings optimisation ..................... 13
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COMPLEX RADIO CONTROL SYSTEM
4.3.2 Training: Airplanes ............................................................ 25
4.3.3 Normal (Damping): Airplanes ....................................... 26
4.3.4 Heading Hold: Airplanes .................................................. 26
Multicopters ......................................................................... 26
4.3.7 Sport: Multicopters .......................................................... 27
5.3 Camera gimbal ............................................................................ 31
4.3.5 Stabilisation of the horizon: Airplanes and
4.3.8 Acro: Multicopters ............................................................. 28
4.3.9 Altitude stabilisation: Multicopters ............................... 28
5.1 Throttle to PID attenuation (TPA) ............................................ 29
5.2 Additional channels ................................................................... 30
4.3.6 Stabilise: Multicopters ...................................................... 27
5. Additional stabilisation features ................................................ 29
5.5.4 Example of band filter adjustment ................................ 36
5.5.3 Band Filter (Notch Filter) ............................................. 36
5.6 Sensor calibration .................................................................... 36
5.4 Connecting an external LED strip ............................................ 33
5.5 Vibration analysis and filtering .............................................. 35
5.5.2 PID Derivative Low-Passfilter .......................................... 35
5.5.1 Vibration analysis .............................................................. 35
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COMPLEX RADIO CONTROL SYSTEM
7. Alternative pins configuration .......................................................... 43
7.1 Receiver Outputs ......................................................................... 46
9. Solving the most common problems ............................................... 48
6.5 Fail-Safe ........................................................................................ 41
9.1 General .......................................................................................... 48
9.3 Multicopter models ................................................................... 49
10. Receiver update and configuration ............................................... 51
10.1 Update the receiver ..................................................................... 51
6.3 Acro mode settings ................................................................... 40
6.1 PID control setting ...................................................................... 39
10.2 Configuring the receiver via a PC ............................................. 52
11. Activation of extension functions ............................................... 53
11.2. Activating the receiver's vario and altimeter function ...... 54
11.1. Registration and purchase of the module ............................ 53
9.2 Airplane models .......................................................................... 48
8. Real time telemetry .............................................................................. 47
6.4 Arming switch .............................................................................. 41
6. Advanced properties ............................................................................. 38
6.2 "Stabilise" mode setting ............................................................. 39
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COMPLEX RADIO CONTROL SYSTEM
The REX A receivers enhance the REX series of receivers and extend
for airplane models and multicopters. This stabilization works in all
three axes of the model and facilitates flying in windy or otherwise
challenging conditions. Aerobatic maneuvers will be more
accurate and smoother. With the help of several flight modes,
which are also suitable for beginner pilots, flying practice will be
really easy.
The REX A receivers are compatible with all existing 2.4GHz Duplex
You can set them directly via DC/DS transmitters, alternatively you
can use the USBa adapter and JETI Studio software (free download
Tx modules and DC/DS transmitters.
it with the intelligent flight stabilization feature, which is designed
(e.g., receiver quality, inertial unit status and G-force level). They
also process telemetry from external sensors compatible with
Duplex EX or EX Bus
at www.jetimodel.com). The receivers provide internal telemetry
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REX receivers with function ASSIST
1 Introduction English

COMPLEX RADIO CONTROL SYSTEM
Basic data
REX
6A
7A
REX
REX
7SA**
9SA**
REX
REX
10A
REX
12A*
Dimensions [mm]
38x25x11
42x28x11
60x16x13
60x16x13
51x28x11
51x28x11
Weight [g]
11
13
13
13
16
24
Antenna lenght [mm]
2x100
2x200
2x200
2x200
2x200
2x400
Number of output channels
6
7
7
9
10
12
Temp. range [°C]
-10 to +85
-10 to +85
-10 to +85
-10 to +85
-10 to +85
-10 to +85
Supply voltage [V]
3,5 – 8,4
3,5 – 8,4
3,5 – 8,4
3,5 – 8,4
3,5 – 8,4
3,5 – 8,4
Average current [mA]
80
80
80
80
80
80
Real time transmission of
telemetry data
Yes
Yes
Yes
Yes
Yes
Yes
Programing
Tx - DC/DS
Tx - DC/DS
Tx - DC/DS
Tx - DC/DS
Tx - DC/DS
Tx - DC/DS
Support satellite receiver (Rsat)
Yes
Yes
Yes
Yes
Yes
Yes
Power output [dBm]
15
15
15
15
15
15
Receiver sens. [dBm]
-106
-106
-106
-106
-106
-106
Frequency [MHz]
2400 - 2483
2400 - 2483
2400 - 2483
2400 - 2483
2400 - 2483
2400 - 2483
Integrated sensors
3-axis gyroscope, 3-axis accelerometer, pressure sensor
Height measurement sensetivity
0,1m
Gyroscope measurement range
± 2000°/s
Accelerometer measurement
range
± 16G
Sampling frequency
gyroscope/accelerometer
6600Hz
2 Technical data
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** - lim- slim receiver for mounting in small fuselagesSS
* - xternal ower onnector- the receiver has power supply cables with an EPC EPC
MPX connector

COMPLEX RADIO CONTROL SYSTEM
ź Up to 16 stabilised airplane channels.
ź Support for different multicopter types – from tricopters to
octocopters.
ź Up to 3 adjustable flight modes, options for stabilising the
horizon and altitude.
2.1. Properties
ź Available telemetry: Receiver voltage, signal quality, G-force,
attitude orientation.
ź Full set-up options with DC/DS transmitters or via PC.
ź Support of telemetry and up to 3 sensors connected directly.
ź Vibration analysis.
ź Always check the polarity of the lead wires so that the voltages on
the receiver and other electronics are not reversed.
ź Do not expose the receiver to heat and sudden temperature
changes that may affect the accuracy of the sensors.
ź Support for LED strip consisting of WS2812 chips.
ź Intelligent fail-safe.
ź Using the latest 3-axis gyroscope and 3-axis accelerometer.
ź Support for external camera gimbal driven by servos.
ź In-flight gain tuning using free channels.
2.2 Important Notices
ź Always use the current firmware in your DC/DS transmitter and
receiver. The minimum version of software for transmitters
supporting REX A receivers is 4.24.
ź When installing on a combustion engine model, keep in mind
ź Never use a receiver that is visibly damaged. In particular, check
the state of the antennas regularly. In no way modify or remove
the receiver electronics from the supplied housing.
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COMPLEX RADIO CONTROL SYSTEM
ź Any major changes to the settings (especially for the initial
configuration) should be done without the propellers fitted.
ź During use, it is recommended to switch on the transmitter first
and then the receiver. The transmitter confirms that the receiver is
turned on by an acoustic signal. When turning off the system, first
switch off the receiver and then the transmitter.
ź Always use a sufficiently sized power source for the receiver and
servos. Keep in mind that with the stabilisation switched on, the
servos in the airplane model are constantly moving, resulting in
increased current consumption and subsequent heating of the
components.
ź Do not expose the receiver to excessive vibration. Sensors in the
receiver are very sensitive and vibrations are an undesirable
phenomenon. It is advisable to check the vibration level with the
built-in analyzer before flight and to take appropriate measures
to reduce vibration (e.g. attach the receiver in the model with a
soft double-sided adhesive tape).
that all electronics must be optically isolated from the ignition
unit and ideally located as far as physically possible from the
engine itself.
ź Do not expose the receiver to direct air flow. Aerodynamic forces
may have a strong influence on the sensitive barometric sensor
when the model is moving faster.
ź REX A receivers do not support Clone mode. This is because the
stabilizing receiver should always be the primary receiver in the
model. Other „A” type receivers, serving as satellites, must not
have the stabilisation enabled.
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COMPLEX RADIO CONTROL SYSTEM
for this purpose.
3.1. Installation in the model
ideally as close as possible to the center of gravity (especially for
multicopters). This is important for the proper functioning of
stabilisation and its correct response. It is important that the
mounting of the receiver is made in such a way that the vibrations
from the model are minimized and that the fixation is guaranteed at
Always place the receiver in the model parallel to the flight axes and
the right place. We recommend using a double-sided adhesive tape
3 Installation
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3 Installation

COMPLEX RADIO CONTROL SYSTEM
need to activate this position in the setup wizard. The direction of
There are several ways to place the receiver in the model, and you
the arrow on the receiver sticker determines its placement:
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Rotated - 90°
Standing - left
backwards
Rotated - 270°
Rotated - 180° Upside down
Vertical - on the
right
Vertical- on the
left
Default - Horizontal
Standing - on the
left
Standing - on the
right
Standing - right
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COMPLEX RADIO CONTROL SYSTEM
The supply voltage can be connected to the receiver in the
following ways:
or a stabilized BEC voltage source (either as a separate device or
integrated in the speed controller).
ź Via throttle channel (when using the speed controller BEC).
ź Using the Battery ports or any free or open receiver port.
Note: never connect two different voltage sources in parallel, even
if they seem to have the same parameters.
źVia the MPX connector included on EPC receivers (Extended Power
Connector).
REX A receivers be powered by low-resistance Li-XXX type batteries
For multirotors, use either a BEC output from a single controller
or, in case of Opto-type controllers, use an external stabilised
source. Never connect voltages from several BEC circuits in
parallel.
3.2. Power supply
When designing a wiring system in the model, always be careful
about choosing a suitable power supply so that it is sufficiently
current-rated and its output voltage is compatible with the
receiver, servos and other electronics. It is recommended that the
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COMPLEX RADIO CONTROL SYSTEM
Note: if binding fails, please turn off the transmitter and receiver and
repeat the procedure.
Note: before turning on the transmitter to bind first make sure it
has been set to the correct model file.
Procedure:
3. Switch on the transmitter - the transmitter emits an acoustic
signal announcing the detection of a new receiver.
The communication between the receiver and the transmitter is
secure and of course digital. Therefore, it's necessary to bind the
device (transmitter/receiver). This is always a necessary step when
using a new receiver or transmitter. You only need to bind the
receiver once, the transmitter will remember the bound devices.
1. Insert the BIND PLUG (included in the receiver packing) into the
receiver socket labeled Ext.
3.3. Operation
We recommend that you switch on the transmitter first and then
subsequently the receiver. The transmitter confirms the switching
on of the receiver with an acoustic signal. When switching off the
system we recommend that you switch off the receiver first and
then subsequently proceed with switching-off the transmitter.
3.4. Binding
2. Switch on the receiver – (connect a proper voltage supply to the
receiver). Binding of the receiver may now be performed within 60
seconds. After the 60 seconds elapse the receiver returns to setup
mode and the binding process must be repeated by starting again
from step 1.
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COMPLEX RADIO CONTROL SYSTEM
and transmitter at a height of at least 80cm (3ft) from the ground. A
properly operating transmitter and receiver should reliably control
the model at a distance of at least 50 meters (or 50 yards) in the test
mode. If this is not the case, be sure to check the correct installation
of the receiver antennas. If the test is not successful afterwards then
do not use the device and contact your dealer or one of our service
centers.
ź Alternatively, you can run the range test in the DC/DS transmitter
via the System – Servo & Range Test menu.
Setting into Range Test mode:
ź Connect the binding plug into the Ext. port of the receiver, turn on
the receiver and then the transmitter. Range test mode will be
active for as long as the bind plug is inserted in the Ext. port.
During the range test, the transmitter warns with an acoustic
signal that it is reduced transmission power.
By range testing, you verify the correct operation of the transmitter
and receiver. You should perform a range test before your first flight
of each flight day, or if there are any doubts about the function of
the transmitter or receiver. In the range test mode, the transmit
power is reduced to 10%. When testing range, place both the model
3.5. Range test
You may bind an arbitrary number of receivers to one transmitter.
The receiver, however, can only be bound to one transmitter, i. e. the
receiver is only bound to the most recently bound transmitter.
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COMPLEX RADIO CONTROL SYSTEM
3. Bind the transmitter with the receiver.
2. Create a new model in the transmitter as usual. The individual
channels of the transmitter should correspond with the outputs
on the receiver.
1. Place the receiver in the model according to the "Installation in
the model" chapter.
5. Now go to the receiver configuration – either through the DC/DS
menu (Model -> Device Explorer) or via your PC (see chapter a)
Configuring the Receiver with PC).
4. For the model, set its subtrims, dual rates and expos according to
the recommended values. Do not set up advanced mixes or
change the servo path using servo balancer.
6. Run the stabilisation setup wizard (Configuration -> Quick b)
Wizard ) . On the first screen, enter the "Airplane Assist" option
and go to the next page with the "Next" link.
From production the REX Assist receivers behave as standard
receivers and stabilisation is not active by default. This can be used
4.1. Airplane
to set up an airplane model - the initial procedure is similar:
4 Quick setup
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a) b)
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COMPLEX RADIO CONTROL SYSTEM
7. Specify the model type so that its
flight characteristics best match
one of the options. Each model type
i n c l ud e s p re c on f i g u re d a n d
optimised stabilisation presets.
 All servos digital - This option
specifies the servo output period. If
all the servos are digital in the
model, the output period will be
a u t o m a t i c a l l y s e t t o 7 . 5 m s.
Otherwise, it will be 17.5ms.
8. Select the receiver position in the
mo del s o tha t the d is p la yed
graphics matches real situation. A
total of 11 options are available (see
chapter Installation the model).
9. Now check for additional features:
 U s e c a m e r a g i m b a l - b y
selecting, you enable the function
of an external servo control for
camera gimbal.
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COMPLEX RADIO CONTROL SYSTEM
11.Assign a channel for switching
stabilisation flight modes. For the
possibility of choosing three flight
modes of stabilisation, select one of
the three-position switches.
10. Carefully make the calibration of
the sticks, elevators and rudder
functions step by step according to
the instructions of the wizard. After
correct calibration, the values in the
Controller line have to be in the
range of -100/0/+100 in the neutral
and full positions of the controller of
the exact function.
Note: first add a three-position switch to your DC/DS transmitter
as a new function in the Model – Functions Assignment menu.
Then assign this option to a free channel in the Model – Servo
Assignment menu. Subsequently, this three-position switch can
be used here in the receiver setup wizard.
12. If you have selected the "Use
gimbal" option in the previous steps,
assign the individual channels to the
gimbal control. You can skip this point
and configure the camera gimbal later
in the „Configuration -> Channel
Assignment -> Gimbal channels”.
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COMPLEX RADIO CONTROL SYSTEM
Note: system calibration has to be made after each model trim.
4.1.1. Airplane model settings optimization
In the "Airplane Settings" menu in the REX A configuration you can
fine- tune the stabilisation gains for individual axes:
13. Confirming the "Apply and exit
wizard" option will save the set
stabilisation parameters and exit the
setup wizard.
16. Make the first flight either with stabilisation disabled (manual
mode) or in "Normal" mode. If the model does not fly straight,
trim it and then land. Re-assign the primary channels (see point
10).
Gain – adjustment of the gain (sensitivity) of stabilisation for each
axis separately. If the model is not sufficiently stabilised, increase
the gain until the model starts to oscillate slightly in flight. Then
reduce the gain to a stable flight. Try the new settings at different
model speeds and verify that there are no oscillations even at high
speeds.
15. Check for correct input control response and stabilization
function when moving in each axis. For example, if you rotate
the model to the left, the control surfaces should tend to move in
the opposite direction.
14. Before flight, place the model on
the ground and hold it stable during
the gyroscope initialization. Once
the initialization is completed, it is
then possible to control servos.
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Heading hold – determines how
strongly the model will hold its
orientation in the given direction in the
" H e a d i n g H ol d " m o d e. I n t h e
"Normal" mode, this parameter is not
reflected in any way. You can only test
the direction holding function, for
example, while hanging on a propeller,
or in knife edge flight.
For each Flight mode, you can set the
default gain (this multiplies the
stabilisation gain and the heading hold
ability in all axes). You can also specify
whether to use the gain tuning via
special dedicated channels (see
„Configuration - Channel Assignment
- Assign Additional Channels”).
3D Aerobatic Factor (Stick Priority) - determines how the
stabilisation gain decreases depending on how the control stick
moves from the center position. For instance, a 60% aileron stick
priority means that at maximum left or right, the aileron gain will be
reduced to 40% and the stick direct position will be applied from
60%.
4.1.2. Choice of flight modes
Depending on your preferences, choose which flight modes to use
during flight - a total of 5 modes are available, allowing you to
switch between three in flight (see Description of flight modes
section).
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COMPLEX RADIO CONTROL SYSTEM EN
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Turn assistant - stabilisation will
automatically optimize the turning of
the model using ailerons and rudder.
Damping only - Ticking this option will
allow you to use butterfly, trims and
glider mixes without any side effects.
Fail-Safe: in "intelligent" mode, the
system will actively stabilise the model in horizontal flight when the
signal is lost. When "Assist off" is selected, the Fail-Safe system will
only work according to the settings in the "Configuration/Fail-
Safe" menu of the receiver.