JETI model Duplex REX Assist Series, Duplex REX6A, Duplex REX10A, Duplex REX12A, Duplex REX7A User Manual

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COMPLEX RADIO CONTROL SYSTEM

User Manual User Manual User Manual

Receivers REX

FW 1.05FW 1.05FW 1.05

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1. Introduction ......................................................................................... 04

2. Technical data ...................................................................................... 05

2.1 Properties ..................................................................................... 06

2.2 Important Notices ....................................................................... 06

3. Installation ........................................................................................... 08

3.1 Installation in the model ............................................................ 08

3.2 Power supply ............................................................................... 10

3.3 Operation ..................................................................................... 11

3.4 Binding .......................................................................................... 11

3.5 Range test .................................................................................... 12

4. Quick Setup ........................................................................................... 14

4.1 Airplane ........................................................................................ 14

4.1.2 Choice of flight modes ...................................................... 19

4.2 Multicopter ........................................................................... 21

4.2.1 Optimize multicopter settings ........................................ 27

4.2.2 Choice of flight modes ...................................................... 30

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4.3 Description of flight modes ...................................................... 31

4.3.1 Manual (Assist Off ): Airplanes ........................................ 31

4.3.2 Training: Airplanes ............................................................ 31

4.3.3 Normal (Damping): Airplanes ........................................ 32

4.3.4 Heading Hold: Airplanes .................................................. 32

4.3.5 S ta bi li za ti on o f the h or iz on : A irp la nes a nd

Multicopters ......................................................................... 32

4.3.6 Stabilize: Multicopters ...................................................... 33

4.3.7 Sport: Multicopters .......................................................... 33

4.3.8 Acro: Multicopters ............................................................. 33

4.3.9 Altitude stabilization: Multicopters ............................... 34

5. Additional stabilization features .................................................. 35

5.1 Throttle to PID attenuation (TPA) ............................................ 35

5.2. Airspeed compensation ............................................................ 36

5.3 Additional channels ................................................................... 36

5.4 Camera gimbal ............................................................................ 38

5.5 Connecting an external LED strip ............................................ 39

5.6 Sensor data filtering ................................................................... 41

5.7 Sensor calibration ....................................................................... 42

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5.8 Vibration analysis ....................................................................... 43

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6. Advanced properties ............................................................................ 45

6.1 PID control setting ...................................................................... 46

6.2 “Stabilize” mode sett ................................................................... 47

6.3 Acro mode settings ..................................................................... 48

6.4 Filtering ......................................................................................... 49

6.5 Fail-Safe ........................................................................................ 50

7. Alternative pins configuration .......................................................... 51

7.1 Receiver Outputs ......................................................................... 54

8. Real time telemetry ................................................................................ 55

9. Solving the most common problems ............................................... 56

9.1 General ......................................................................................... 56

9.2 Airplane models ....................................................................... 56

9.3 Multicopter models .................................................................... 58

10. Receiver update and configuring ................................................... 59

10.1 Update the receiver ..................................................................... 59

10.2 Configuring the receiver with a PC ........................................... 60

....

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REX Receivers with Assist Functions

1 Introduction

The REX A receivers enhance the REX series of receivers and extend

it with the intelligent flight stabilization feature, which is designed

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

Tx modules and DC/DS transmitters.

You can set them directly via DC/DS transmitters, alternatively you

can use the USBa adapter and JETI Studio software (free download

at www.jetimodel.com). The receivers provide internal telemetry

(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.

In order to stabilize the airplane model effectively in flight, it is

appropriate to equip the model with high speed digital servos.

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Stabilization is also suitable for combustion engine models.

ENGLISH

FW. ver. 1.05

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Basic Data

REX6A

REX7A

REX10A

REX12A*

Dimensions [mm]

38x25x11

42x28x11

51x28x11

Weight [g]

111316

Antenna length [mm]

2x100

2x200

2x400

# of channel outputs

6710

Temperature range [°C]

-10 to +85

Supply voltage [V]

3.5 – 8.4

Average current [mA]

808080

Real time transmission

of telemetry data

Yes

Programming

Tx - DC/DS

Support satellite receiver Rsat

Yes

Power output [dBm]

151515

Receiver sensitivity [dBm]

-106

Frequency [MHz]

2400 - 2483

Built-in sensors

3-axis gyroscope, 3-axis accelerometer

Sensitivity of altitude measurement

0,1m

Range of gyroscope measurement

± 2000°/s

Range of accelerometer measurement

± 16G

Gyroscope/accelerometer sampling rate

6600Hz

The JETI model company portfolio contains a diverse offering of

electronic modelling equipment like voltage regulators, motor

speed controllers, telemetry data display equipment, telemetry

sensors and, last but not least, DC/DS transmitters. The JETI

model product manfacturing policy is to constantly produce the

highest quality product possible.

2 Technical data

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EPC

* xternal ower onnector

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2.1 Properties

 Up to 16 stabilized airplane channels.

 Support for different multicopter types – from tricopters to

octocopters.

 Up to 3 adjustable flight modes, options for stabilizing the

horizon and altitude.

 In-flight gain tuning using free channels.

 Using the latest 3-axis gyroscope and 3-axis accelerometer.

 Support for LED strip consisting of WS2812 chips.

 Support for external camera gimbal driven by servos.

 Intelligent fail-safe.

 Vibration analysis.

 Full set-up options with DC/DS transmitters or via PC.

 Available telemetry: Receiver voltage, signal quality, G-force,

attitude orientation.

 Support of telemetry and up to 3 sensors connected directly.

2.2 Important Notices

 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.

 Always check the polarity of the lead wires so that the voltages

on the receiver and other electronics are not reversed.

 Do not expose the receiver to heat and sudden temperature

changes that may affect the accuracy of the sensors.

 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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 When installing on a combustion engine model, keep in mind

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that all electronics must be optically isolated from the ignition

unit and ideally located as far as physically possible from the

engine itself.

 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).

 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.

 Always use a sufficiently sized power source for the receiver and

servos. Keep in mind that with the stabilization switched on, the

servos in the airplane model are constantly moving, resulting in

increased current consumption and subsequent heating of the

components.

 Any major changes to the settings (especially for the initial

configuration) should be done without the propellers fitted.

 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.

 REX A receivers do not support Clone mode. This is because the

stabilizing receiver should always be the primary receiver in the

model. Other receivers, serving as satellites, must not have the

stabilization enabled.

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3 Installation

3.1 Installation in the model

Always place the receiver in the model parallel to the flight axes and

ideally as close as possible to the center of gravity (especially for

multicopters). This is important for the proper functioning of

stabilization 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

the right place. We recommend using a double-sided adhesive tape

for this purpose.

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Default - Horizontal

Rotated by 90°

Vertical – on the left

Vertical – on the right

Inverted - Horizontal

Standing – on the left

Standing – on the right

Rotated by 180°

There are several ways to place the receiver in the model, and you

need to activate this position in the setup wizard. The direction of

the arrow on the receiver sticker determines its placement:

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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

REX A receivers be powered by low-resistance Li-XXX type batteries

or a stabilized BEC voltage source (either as a separate device or

integrated in the speed controller).

Never connect two different voltage sources in parallel, even if

the y seem to have the sa me parame ters. Ins tead, use an

additional circuit, such as DSM10, to separate both sources which

become independent.

The supply voltage can be applied to the receiver in the following

ways:

 Via throttle channel (when using the speed controller BEC).

 Using any free or open receiver port.

 Via the MPX connector included on EPC receivers (Extended Power

Connector).

For multirotors, use either a BEC output from a single controller

or, in case of Opto-type controllers, use an external stabilized

source. Never connect voltages from several BEC circuits in

parallel.

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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

When using a new receiver or transmitter it is necessary to carry out

the binding process between them. Transmission between the

receiver and transmitter occurs in fully digital manner, therefore it is

necessary to identify and share the addresses of each device

communicating on the mutual 2.4GHz frequency band.

Procedure:

1. Insert the BIND PLUG (included in the receiver packing) into the

receiver socket labeled Ext.

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.

3. Switch on the transmitter - the transmitter emits an acoustic

signal announcing the detection of a new receiver.

Binding may be carried out with the aid of the JETIBOX instead of

using the BIND PLUG.

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The procedure is as follows:

1. Connect the JETIBOX with the connecting cable to the Ext.

receiver output .

2. Switch on the receiver - (connect a proper voltage supply to the

receiver).

3. The receiver menu appears on the JETIBOX display. Select the

„Pairing“ menu item (push the right arrow button once from the

main receiver display) and then push the upward button. You now

have a period of 60 seconds to bind the receiver. After the 60

seconds elapse the receiver returns to setup mode and the binding

process must be repeated by starting again from step 3.

If the binding process between receiver and transmitter was

unsuccessful, try again.

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.

3.5 Range test

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

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

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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.

Setting into Range Test mode:

Insert the pairing jumper (BIND 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.

 Alternatively, you can run the range test in the DC/DS transmitter

via the System – Servo & Range Test menu.

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4 Quick Setup

4.1 Airplane

From production the REX Assist receivers behave as standard

receivers and stabilization is not active by default. This can be used

to set up an airplane model - the initial procedure is similar:

1. Place the receiver in the model according to the “Installation

in the model” chapter.

2. Create a new model in the transmitter as usual. The individual

channels of the transmitter should correspond with the

outputs on the receiver. If you plan to use additional channels

to tune the stabilization gain or to switch flight modes, this is

the moment you should create them. By doing that you won’t

have to go back to your channel settings while configuring the

receiver via Quick Wizard menu. More information about the

auxiliary channels can be found in the Additional channels

section.

3. Pair the transmitter with the receiver.

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.

5. Now go to the receiver configuration – either through the

DC/DS menu (Model -> Device Explorer) or via your PC (see

chapter Configuring the Receiver with PC).

6.b) Run the stabilization setup wizard (Configuration -> Quick

Wizard ) . On the first screen, enter the “Airplane Assist”

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option and go to the next page with the “Next” link.

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7. Specify the model type so that its flight characteristics best

match one of the options . Several types of gliders,

aerobatic models and others are available. Each model type

includes preconfigured and optimized stabilization presets so

that the first flights are enjoyable and the additional settings

are kept to a minimum.

8. In the next step, select the receiver

position in the model so that the

displayed graphics matches real

situation. A total of 8 options are

available (see chapter Installation

the model) . Illustration indicates

flight direction.

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9. Now check for additional features

g):

 Use airspeed correction – if the

model is able to move at a large

range of speeds, it is advisable to

supplement it with the MSPEED

sensor or MGPS for measuring

flight speeds. By activating this

field, the receiver will take into

account the current speed while

performing stabilization.

 Us e c ame ra gimb al - by

checking, you enable the function

of an external servo control for

camera gimbal.

 All servos digital - This option

specifies the servo output period. If all the servos are digital in

the model, the output period will be automatically set to

7.5ms. Otherwise, it will be 17.5ms.

10. Assign the individual channels for stabilization so that the

receiver learns neutral positions

and throws of individual servos .

The model can now be placed

arbitrarily because at this point

you only calibrate the control

functions. Proceed step by step

ac cording to th e wizard a nd

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calibrate only the axes that will be

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used during stabilization. Check the correct response to the

controls by looking at values displayed in the “Controls” row. If

the servos in the model are not moving, it is ok at this point -

the receiver will not allow servo outputs until the configurati-

on is completed.

11.f) Assign a channel for switching flight stabilization modes .

This channel should be controlled

by a three- position switch, so that

all three flight modes are available.

In position the stabilization is

disabled by default. Switching to

position (center) activates the

“No rmal” mode. Switching to

position activates the "Heading

Hold" mode.

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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13.j) Finish the wizard and application settings . When you run the

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“A p pl y wi z ar d and f in i sh ”

c o mm an d , y o u s t or e th e

parameters in the receiver and the

stabilization is reset to the mode

according to data you’ve entered.

Attention: At this po int , th e

se tt ings of in div id ual se rv o

outputs, flight mode configurati-

on, and the PID control gains will

be reset.

14. Before each flight, place the model

on the ground and hold it stable

during the gyroscope initializati-

on . On ce t he i nitiali zation is

completed, it is possible to move

servos.

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.

16. Perform the first flight either with stabilization disabled

(manual mode) or in “Normal” mode. If the model does not fly

straight, trim it and then land. Re-assign the primary channels.

Continue to optimize the settings so that the flight characteris-

tics of the model match your preferences.

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4.1.1 Airplane model settings

optimization

In the “Airplane Settings” menu in the

REX A configuration you can fine- tune

the stabilization gains for individual

axes.

Gain - This parameter determines the

proportional rate of model stabilizati-

on in flight. If the model is insufficiently

stabilized, for example in wind gusts, increase the gain each time by

20% until the model starts to oscillate. Consequently, reduce your

value by 20%. Try the new settings at different flight speeds and

make sure that even at high speeds there are no oscillations.

Heading - Determines how intensively the model keeps its

orientation and direction in the “ Heading Hold ” mode. In

“Normal” mode, this parameter is not used. You can test the

function of heading hold function, for example, when you are in

knife edge flight.

3D Aerobatic Factor (Stick Priority) - Determines how the

stabilization 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%.

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JETI model Duplex REX Assist Series, Duplex REX6A, Duplex REX10A, Duplex REX12A, Duplex REX7A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual