Related Manuals for JETI model Duplex REX Assist Series
Summary of Contents for JETI model Duplex REX Assist Series
- Page 1 computer radio control system COMPLEX RADIO CONTROL SYSTEM User Manual User Manual Receivers REX ® www.modellmarkt www.modellmarkt FW 1.05 FW 1.05...
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Page 2: Table Of Contents
computer radio control system 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 .................. - Page 3 computer radio control system 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 Stabilization of the horizon: A irplanes and Multicopters .................
- Page 4 computer radio control system 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 .................
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Page 5: Introduction
computer radio control system REX Receivers with Assist Functions ENGLISH 1 Introduction FW. ver. 1.05 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. -
Page 6: Technical Data
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. -
Page 7: Properties
computer radio control system 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. •... - Page 8 computer radio control system 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.
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Page 9: Installation
computer radio control system 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. - Page 10 computer radio control system 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: Default - Horizontal Rotated by 90°...
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Page 11: Power Supply
computer radio control system 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). -
Page 12: Operation
computer radio control system 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. -
Page 13: Range Test
computer radio control system The procedure is as follows: Connect the JETIBOX with the connecting cable to the Ext. receiver output . Switch on the receiver - (connect a proper voltage supply to the receiver). The receiver menu appears on the JETIBOX display. Select the „Pairing“... - Page 14 computer radio control system 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.
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Page 15: Quick Setup
computer radio control system 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: Place the receiver in the model according to the “Installation in the model”... - Page 16 computer radio control system Specify the model type so that its flight characteristics best match one of the options d), e) . 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.
- Page 17 computer radio control system Now check for additional features 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.
- Page 18 computer radio control system 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.
- Page 19 computer radio control system “A p p l y w i z a r d a n d f i n i s h” c o m m a n d , y o u s t o r e t h e parameters in the receiver and the stabilization is reset to the mode according to data you’ve entered.
- Page 20 computer radio control system 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.
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Page 21: Choice Of Flight Modes
computer radio control system 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 Descrip- tion of flight modes section). Specify the Fail-S afe mode: I n Intelligent mode, the receiver will stabilize the model in horizontal... -
Page 22: Multicopter
computer radio control system 4.2 Multicopter Before you connect and configure the REX A receiver for the first time in a multicopter model, we recommend disconnecting speed controllers with motors from the receiver to avoid accidental spinning. Remove the propellers from motors. Place the receiver in the model according to the Installation in the model chapter. - Page 23 computer radio control system Select the type of your multicopter frame c) d) and continue to the next page by pressing the “Next” link. The following types of frames are supported (direction of rotation and motor sequence must always be observed): Tricopter Y Quadcopter + Quadcopter X...
- Page 24 computer radio control system On the next screen , select the multicopter characteristics to best match your model. Each type includes preconfigured and optimized presets for stabilization so that the first flights are enjoyable and additional settings are kept to a minimum. In the next step , select the receiver position in the model so...
- Page 25 computer radio control system for ser vos that are used as additional channels. If all the servos in the model are digital, the output period will be automati- cally set to 7.5ms. Otherwise, it will be 17.5ms. The output control period for the motors is 2.5 ms, which means 400Hz.
- Page 26 computer radio control system Assign a channel for switching flight stabilization modes. This channel should be operated by a three- position switch, so that all three flight modes should be available. In position 1 the altitude and horizon stabilization is enabled by default. Switching to position 2 (center), a simple horizon stabilization mode with direct throttle is activated.
- Page 27 computer radio control system Attention: At this point, the settings for individual motors/servo outputs, flight mode configurations and PID control gains will be reset. In the Configuration -> Multicopter Settings menu, test the correct rotation direction of the motors according to the diagram displayed on the top of the screen.
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Page 28: Optimize Multicopter Settings
computer radio control system Before your first flight, it is necessary to test the stabilization reaction with the propellers, ideally when the model is mounted on a test bench which allows rotation in only one axis. It is necessary to ensure that the model in the Aerobatic or Sport mode is able to maintain a constant direction at zero stick movement and also to avoid undesirable oscillations. - Page 29 computer radio control system r e c e i v e s a c o m m a n d t o r u n a t minimum revolutions for approximate- ly 1s. The rotation direction must correspond to the diagram in the menu on the transmitter display.
- Page 30 computer radio control system If the multicopter is capable of flying, but its behavior is not entirely ideal, it will be necessary to fine-tune the PID gains of the stabilization loop - see the C o n f i g u r a t i o n - > A d v a n c e d Properties menu.
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Page 31: Choice Of Flight Modes
computer radio control system steps, as the model might begin to oscillate very quickly. When testing the modified coefficients, take off and apply small but fast movements on the inputs and check if the multicopter reacts quickly, but without overshots. The rudder axis (Yaw) is not so critical for fine tuning the gain - after moving a stick in yaw direction, the multicopter should not become unstable and should not experience significant changes in altitude. -
Page 32: Description Of Flight Modes
computer radio control system channels (see Configuration -> Channel Assignment -> Additional Channels Assignment). Determine the fail-safe mode: In intelligent mode, the receiver will stabilize the model horizon (at the last known throttle level). On the other hand, when selecting “Assist Off”, all engines will be stopped. -
Page 33: Normal (Damping): Airplanes
computer radio control system 4.3.3 Normal (Damping): Airplanes This is a basic mode for flying in the wind, suitable for takeoffs and landings. Stabilization works in 3 axes and suppresses the effects of external forces like wind turbulences or gusts. Aerobatics may be unlimited. -
Page 34: Stabilize: Multicopters
computer radio control system in mind that it is necessary to maintain sufficient speed, as the Heading Hold mode is active at the same time. 4.3.6 Stabilize: Multicopters The basic functions of the REX A receiver to stabilize the multicopter. The model is kept in a horizontal position during the flight, with the position of the controls indicating the pitch and roll angle of the multicopter. -
Page 35: Altitude Stabilization: Multicopters
computer radio control system 4.3.9 Altitude stabilization: Multicopters This mode is similar to the Stabilize mode, with the climb and descent rate being stabilized. The throttle position indicates vertical velocity. In the neutral position of the stick (which is around 1.5ms), constant altitude is stabilized. -
Page 36: Additional Stabilization Features
computer radio control system Additional stabilization features Additional functions of the REX A receivers can be used to fine tune or extend the basic stabilization functionality. 5.1 Throttle to PID attenuation (TPA) This feature is available for multicopter models to help suppress oscillations when throttle is pushed rapidly. -
Page 37: Airspeed Compensation
computer radio control system 5.2 Airspeed compensation This feature is available for airplane models and helps to suppress oscillations in stabilized flight at high speeds. As the control surfaces efficiency increases at the same time as the speed increases, the stabilization gain in the individual axes should be adjusted accordingly with respect to the actual speed so that the resulting stabilization effect is constant throughout the flight and there are no inappropriate reactions. - Page 38 computer radio control system each channel must first be created on the transmitter – when using DC/DS transmitter via the Model menu -> Function Assignment and Servo Assignment. Flight mode switching channel - here you can assign a dedicated channel to switch flight modes. This channel should ideally be operated by a three-way switch on the transmitter.
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Page 39: Camera Gimbal
computer radio control system negative percent values decrease to a minimum of 10%. The value of 0% corresponds to the unchanged default gain value. 5.4 Camera gimbal REX A receivers support the connection of up to three-axis camera gimbal, whose individual axis (roll, tilt and pan) are controlled by servos connected to individual channels. -
Page 40: Connecting An External Led Strip
computer radio control system Maximum pitch - Specifies the angle at which the servo is tilted to its maximum deflection. Set this value so that the image is stable when moving the model and does not tilt up or down. Camera Yaw (pan) - Shows the assigned channel on the transmitter to rotate the camera. - Page 41 computer radio control system and switch it to “LED Strip” configurati- on. The “LED Strip Settings” link then appears in the receiver configuration, allowing you to change the colors and functions of the individual LED chips. The LED is off The color indicates the “Armed”...
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Page 42: Sensor Data Filtering
computer radio control system 5.6 Sensor data filtering REX A receivers embed advanced digital algorithms for filtering sensor data. The algorithms are designed to suppress undesirable effects caused by vibrations in the model. Two types of filters are used: Low Pass Filter - This type of filter transfers frequencies below the set limit and all higher frequencies are suppressed. -
Page 43: Sensor Calibration
computer radio control system specified frequency. However, as the motor speed and thus the vibration frequency changes during flight, it is preferable to choose wider bandwidth, approx about 100Hz. Set both types of filters in the Configuration -> Advanced Properties and the Filtering section. 5.7 Sensor calibration Sensor calibration is important for the correct and accurate function of... -
Page 44: Vibration Analysis
computer radio control system the receiver in a new model for the first time: In the receiver menu, view Telemetry -> Sensor Calibration screen. Activate the “Start calibration” command and follow the instructions. The receiver must be placed on a horizontal board with one of its six sides and kept still for about 2 seconds. - Page 45 computer radio control system maneuverability. If the vibrations are too high (in the graph approximately over the half of Y axis), we recommend taking some of the following precautions to reduce them: • Fix the receiver in the model with a soft double-sided adhesive tape.
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Page 46: Advanced Properties
computer radio control system Advanced properties Output period - setting the output signal period (Auto setting can be used to synchronize outputs with the transmitter). This parameter fundamentally affects the behavior of the servos. Setting lower output period leads the analogue servos to achieve faster response and increases current consumption. -
Page 47: Pid Control Setting
computer radio control system Note: This option does not apply to EX Bus outputs. These are always direct without receiver recalculation (if the function "Stabilize EX Bus output" is not activated). Stabilize EX Bus output - Check this option to ensure that flight stabilization is applied to the EX Bus output. -
Page 48: Stabilize" Mode Sett
computer radio control system 6.2 “Stabilize” mode setting Maximum roll angle - Defines the maximum possible tilt angle to the left and right in the horizon stabilization mode (controlled by aileron input). Maximum pitch angle - Definition of the maximum possible tilt angle in horizon stabilization mode (controlled by elevator input). -
Page 49: Acro Mode Settings
computer radio control system 6.3 Acro mode settings Maximum Aileron/Roll rate, Maximum Elevator/Pitch rate, Maximum Rudder/Yaw rate - Specifies the maximum angular rotation speed in individual axes (in degrees per second) that can be safely reached by the model. For acrobatic models, this value can be up to two revolutions per second (720°/s), but for gliders it will be noticeably smaller (e.g. -
Page 50: Filtering
computer radio control system 6.4 Filtering Low-Pass filter frequency - Here you enter the frequency of the digital filter (in Herz units) to suppress vibration noise on the gyroscope. Keep in mind that the lower the frequency you enter, the less the model will be prone to vibration, but the accuracy and speed of flight stabilization will be limited. -
Page 51: Fail-Safe
computer radio control system 6.5 Fail-Safe Fail-Safe – Turns the Fail Safe function on or off. If the function is disabled, no pulses on the receiver outputs are generated in case of signal loss. If this function is enabled, the receiver outputs can be configured individually with the following options: •... -
Page 52: Alternative Pins Configuration
computer radio control system Alternative pins configuration Here you can change the modes of the receiver pins. Servo outputs can be configured, for example, in digital input or digital output mode. Servo - standard impulse output for servo control (-100% ~ 1ms, 0% ~ 1.5ms, + 100% ~ 2ms). - Page 53 computer radio control system Motor 1-8 - for a multicopter model, this parameter is used to identify individual motors (assignment is made automatically via the Quick Wizard). Refresh rate of the motor outputs is 400Hz by default, and conventional servo pulses or OneShot125 protocol can be used for control.
- Page 54 computer radio control system LED Strip - A LED strip composed of programmable LED chips can be connected to the dedicated pin of the receiver. Table of possible functions on the individual receiver pins REX 6A REX 7A REX 10A REX 12A Pin1 Pin2...
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Page 55: Receiver Outputs
computer radio control system 7.1 Receiver Outputs The receiver output settings screen allows you to redirect the transmitter channels to any receiver output. For clarity, the transmitter channels are described by their numerical value and their meaning. As the last parameter, you can set the output group (A-H) for each servo separately. -
Page 56: Real Time Telemetry
computer radio control system 8 Real time telemetry By default, the receiver provides operational telemetry data such as battery voltage and signal strength on a scale from 0 to 9. With integrated inertial sensors, it can also provide its orientation in individual axes (roll, pitch and yaw) or total G-force. -
Page 57: Solving The Most Common Problems
computer radio control system 9 Solving the most common problems 9.1 General After pairing the receiver, it is not possible to configure it using the DC/DS transmitter. But the Device Explorer screen displays the correct name (e.g. REX12A). Check the transmitter version (minimum version supporting the REX A receiver is 4.24). - Page 58 computer radio control system In Heading Hold mode, the model does not hold a straight flight and constantly turns to one side. In this mode, it is not possible to use trims as they distort the input information for stabilization. Switch to Normal mode (or deactivate stabilization if necessary), trim the model in straight flight and land.
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Page 59: Multicopter Models
computer radio control system 9.3 Multicopter models The transmitter announces “Armed”, but the motors are not spinning. In the Configuration -> Multicopter Settings menu, be sure to pay attention to the Minimum running throttle parameter. Increase the value in small steps to make the motors spin after arming. When at full throttle, the multicopter oscillates quickly, but when the throttle is in the middle, the flight is calm. -
Page 60: Receiver Update And Configuring
computer radio control system 10 Receiver update and configuring Duplex REX receivers can be updated via PC with the aid of the JETI USB adapter. You may find a detailed description of the receiver update process in the USB adapter instruction manual. -
Page 61: Configuring The Receiver With A Pc
computer radio control system 5. Connect the receiver via its Ext. port to the USB Adapter. 6. The program identifies the connected device and offers an appropriate update. Choose the firmware version and variant and then click the Update button. 7. - Page 62 Warranty and post warranty service is provided by the manufacturer. We wish you sucessful flying with the products of: JETI model s.r.o. Příbor, www.jetimodel.com www.modellmarkt www.modellmarkt...
- Page 63 computer radio control system www.modellmarkt www.modellmarkt...
- Page 64 computer radio control system THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. O P E R AT I O N I S S U B J E C T TO T H E F O L LO W I N G T W O CONDITIONS(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT...
- Page 65 computer radio control system Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence.
- Page 66 Duplex-System EX: • Transmitter modules • Receivers • Telemetric sensors • Compatible accessories • Display units Serial number: Carefully save this serial number! JETI model s.r.o. Lomená 1530, 742 58 Příbor Czech Republic - EU www.jetimodel.com www.jetimodel.de info@jetimodel.cz www.modellmarkt www.modellmarkt...