FrSky RB-25S Dual Power Triple Receiver Redundancy Hub Instruction Manual

FrSky RB-25S Dual Power Triple Receiver Redundancy Hub

Introduction

The RB-25/RB-25S builds on the success of the previously trusted Redundancy Bus Series by adding new advanced features combined with a compact new design that meets the needs of users who want a flight-safe system built in a smaller size unit.

Triple Receiver Redundancy & Dual Power Input
RB-25/RB-25S has been designed to offer both dual-power and triple-receiver redundancy. This provides the user triple receiver signal and telemetry redundancy by adding multiplex ports (RX1-3 IN / S.Port). Dual-power provides a safe and efficient way to power the system with your power sources connected via a pair of standard XT30 connections. The dual-power consumption system is designed to operate in balance mode, where it consumes the power line from either power source depending on which has the higher voltage.

Advanced Stabilizer (RB-25S)
The RB-25S offers an ADV Stabilizer function which is an upgrade over the original classical gyroscope stabilization modes. The ADV Stabilizer offers an advanced mode that provides more programmable stabilized channels and flexibility.

The classical stabilization mode has been enhanced with 5 additional stabilization channels, providing pin mapping to each channel in the multiple flight modes like Stabilization, Auto-Level, Hover, and Knife Edge with an aeroplane model. In the advanced stabilization mode, all the RB25S output pins are configurable for stabilization and additional advanced features such as File Sharing, Programmable Parameters, Developer Access, etc.

Diversified Sensor Telemetry

The RB-25/RB-25S also works as an extensive sensor module with various built- in sensors including diversified telemetry. The RB-25S also includes a high- precision telemetry sensor for monitoring altitude, vertical speed, etc. can be also used as an alternative to using a GR or S series receiver.

Power Switch Function
The built-in power switch function draws the support of using multiple types of external switches (e.g. NFC switch, Pin Plug, etc.) that enable flexible options on how the power can be switched on/off without the need to plug/unplug the battery connections.

Overview

Specifications

• Dimension: 534016mm (LWH)
• Weight: 25.6g (RB-25) / 26.7g (RB-25S)
• Number of Channel Ports: 18 (PWM/FBUS/S.Port/SBUS Out)
• 3 RX Input Ports & 1 LED Indicator Port
• Operating Voltage: 4-10V (Recommend 2S Li batteries)
• Operating Current: ≤185mA@5V / Continuous Current: ≤30A
• Operating Temperature: -20°C~75°C
• Power Input Connector: XT30

Features

• Dual Power Balancing Consumption

• Triple Receiver Redundant Guarantee

• RX In | FBUS/SBUS/S.Port Auto Recognization
  (Note: Only the S.Port on the RX1 channel port can be used to upgrade firmware.)

• Built-in Advanced Stabilization Functions (RB-25S)

• Built-in High-Precision Telemetry Sensor (Altitude, Vertical Speed, etc.) (RB-25S)

• Built-in Power Switch Function | Match with Different External Switches (Optional)

• Supports External LED Indication

• Compatible with FBUS/S.Port Products

Setup Guide – Redundant Signal Control with Telemetry

Setup Guide – Dual Power Redundancy
Balance Mode – When the dual batteries are plugged into the RB flight-safe system the Power Redundancy function is automatically activated. The system is designed to use the battery line from the higher voltage allowing the balancing of power consumption across both batteries.

Note: Please ensure the battery is plugged into VBAT1 while using the single battery. Please ensure that both batteries’ output power is not lower than the power needed for the connected devices, otherwise, there will be an insufficient power supply for the devices.

Stabilizer MODE (RB-25S)
RB-25S supports enabling or disabling the stabilization function module.

• OFF: The stabilization mode cannot be used.
• BASIC: Enable default self-stabilization channels.
• ADV: Editing with RBmixer software is required before use

Note: Normal usage only requires selecting the BASIC mode. If you need to use the ADV stabilization mode, please edit and enable it using the RBmixer software.

Changing the CaliHorizontal option from Disable to Enable can trigger horizontal plane calibration.

Note
This “Cali horizontal” option is only used for ADV mode horizontal calibration. You don’t need to worry about this option when using basic mode.

Option 1
under ‘Stab Index’ in the Stabilizing allows turning on or off the first group of stabilization channels (CH1-6), while Option 2 allows turning on or off the second group of stabilization channels (CH7-11).

Note
The settings for Stable Systems 1 and 2 are independent, and both need to be calibrated when Self-check calibration is required.

Basic Step Guides-Stabilization Function (RB-25S)

• Model Creation and make sure the connected receiver is bound to the radio;
• Ensure stabilization is enabled and calibrate the gyroscope sensor of the device;
• Servo connection and build the stabilization device to the model;
• Set up the mixer channel and radio switches;
• Determine the [Wing Type] & [Mounting Type];
• Check the stabilized channel outputs of the receiver in the Auto-Level mode;
• Check the stick control of the transmitter in the manual mode;
• Self-Check of the receiver;

Failsafe setting.
Note: Please move to the [DOWNLOAD] section from the product page to download the functional Lua scripts (Please copy the scripts folder to the root folder of the storage card to use.).

Gyroscope Sensor Calibration (RB-25S)
Ensure the RB25S stabilization function is enabled.

Move to [RB25S Calibration] tool and calibrate the gyroscope sensor

1. The gyroscope of the device (6 surfaces) must be calibrated before mounting into the model. Please place the device on a flat ground or a table, and follow the instructions steps below to calibrate the gyroscope sensor;
2. Make sure the stabilization device with the Logo label side facing upwards lying on the desktop, move to the radio enter the [RB25S Calibration] tool, and select “click to confirm”. At this moment, the yellow LED light will flash until it lits off, then follow the prompts to calibrate the sensor;

Move to [RB25S Calibration] tool and calibrate the gyroscope sensor

1. The gyroscope of the device (6 surfaces) must be calibrated before mounting into the model. Please place the device on a flat ground or a table, and follow the instructions steps below to calibrate the gyroscope sensor;
2. Make sure the stabilization device with the Logo label side facing upwards lying on the desktop, move to the radio enter the [RB25S Calibration] tool, and select “click to confirm”. At this moment, the yellow LED light will flash until it lits off, then follow the prompts to calibrate the sensor;
3. Complete the calibration of all the device surfaces. Ensure the values of each axis (X, Y, Z, Mod) are about 1.000 while placing the device in the corresponding direction, and the deviation could be ±0.1;
4. The calibration is completed if all the steps above are done.

Servo connection and build the device to the model (RB-25S)
Connect the servos to the ports of the stabilization device according to the Channel List

Note: Please make sure the side with the External Switch Port forwards the nose in the direction of the aeroplane model and with a Single Screw Tab backward. Gyro gains adjustment of CH13: When the value of CH13 is in the centre, the gain is zero. The gain increases as the value gets bigger. Until the value is ±100%, the gain reaches the maximum.

Note
RX1/S. Port is used to do the firmware upgrade and parameter settings by the S.Port tool or ETHOS radio.

Attention
CH1~CH12 should be connected to the corresponding servos.

Set up the mixer channel and radio switches

Refer to the Channel List to set the channel and switches. The switch setting of CH13-16 on the picture is for reference

Move to the [RB25S Stab] tool, determine the [WingType] & [Mounting Type];

1. Wing Type
2. Mounting Type

[Gain] and [Offset] configurations of flight modes

1. Gain – Stab Mode
2. Gain – Auto-Level Mode
3. Gain – Hover Mode
4. Gain – Knife Mode
5. Angle Offset – Auto-Level Mode
6. Angle Offset – Hover Mode
7. Angle Offset – Knife Mode

Check whether the reaction of the wing servo is in line with the flight attitude caption below in the [Auto-Level] mode. If not, please try to invert the corresponding channel output in the [RB25S Stab] tool

Inspection of flight attitude To ensure flight safety, checking the compensation direction of the model is strongly recommended. Activating auto level mode will produce a strong deflection on AIL and ELE, which is used to check the response of the aileron and elevator. Also, activating Knife-edge and Hover mode will have the same reaction on the rudder.

When the plane is rotated left or right (Roll). ailerons should have the correcting actions as illustrated. actions as illustrated. When the plane is rotated to the left or right (Yaw), rudders should have the correcting actions as illustrated. After changing the compensation direction, make sure to check it again on the actual model.

Note
If the compensation direction is incorrect, please reverse the corresponding channel as illustrated above through the RB25S Stab tool. Check whether the reaction of the wing servo is in line with the radio stick operation in the [Manual] mode. If not, please try to invert the corresponding channel output by pressing the channel bar in the [Output] tool.

Self Check (RB-25S)

1. Make sure the model is in a horizontal position on the ground, then put the throttle to 0, and keep the other channels in the centre position.
2. Move to [System] and enter the [RB25S Stab] tool to turn on [Self Check], and then the blue LED light turns on.
3. Once the blue LED starts flashing, we can calibrate the maximum travel of stick channels (excluding the throttle channel).
4. If the calibration is completed, the LED turns off and the servos react left and right to indicate that the calibration process is completed.

Note: To do the Self-Check of the stabilization device, please ensure the stabilization function is enabled. Enter the [RB25S Stab] tool and turn On the [Stabilizing], then quit the [RB25S Stab] tool and back into this tool again, now the [Self-Check] function is capable of enabling.

How to set the flight modes (RB-25S)

Quick Mode
It supports stabilization mode, auto-level mode, and manual (Gyroscope is off) mode and is configured through CH14. What’s more, an emergency mode is added to configure automatic level mode default through CH16. The precise configuration is written below.

Note: The default mode of RB-25S is Quick Mode.

• If Quick Mode is applied, there is no Knife Edge or (3D) Hover Mode.
• CH15 is not used when using Quick Mode

Enable the Quick Mode in the [RB25S] tool.

Flight mode| Stabilization| Automatic level| Hover| Knife- Edge| Off
---|---|---|---|---|---
CH14 (3 pos SW)| CH14 SW Down &

CH15 SW Mid

| CH14 SW Down &

CH15 SW Down

| CH14 SW Down &

CH15 SW Up

| CH14 SW Up

& CH15 SW Mid

|

CH14 SW-Mid

CH15 (3 pos SW)

Flight mode| Stabilization| Automatic level| Hover| Knife- Edge| Off
---|---|---|---|---|---

CH14 (3 pos SW)

| CH14>M+H (CH14 SW Down)| CH14>M+H (CH14 SW Down)| CH14>M+H (CH14 SW Down)| CH14<M-H (CH14 SW Up)| ****

CH14 SW-Mid

CH15 (3 pos SW)

| M-H<CH15<M+H (CH15 SW Mid)| CH15>M+H (CH15 SW Down)| CH15<M-H (CH15 SW Up)| M-H<CH15<M+H (CH15 SW Mid)

Model Configuration Reference (RB-25S)

CH14

| CH14>M+H (CH14 SW Down)| CH14<M-H (CH14 SW Up)|

CH14 SW-Mid

Conventional Model

Note
M: represents a neutral signal period (1500μs)
H: represents the time of required signal change to activate the mode (50μs). When the factory settings are selected, the switch position shown above represents the required modes.

Delta wing & Flying wing & V-tail
The available flight modes can be assigned to CH14 with a three-position switch

1. When the Delta wing/Flying wing is selected, the signal produced by the transmitter should be without active mixes on the channels related to AIL and ELE. RB-25S will mix the AIL (CH1) and ELE (CH2) input signal with a fixed mix percentage automatically.
2. When the V-tail type is selected, the signal produced by the transmitter should be without active mixes on the channels related to ELE and RUD. RB-25S will mix the ELE (CH2) and RUD (CH4) input signal with a fixed mix percentage automatically.

Stabilization: When the model is activated, RB-25S will compensate for external forces (wind) as soon as it receives commands from the transmitter. This function is used to enhance the stability of the model on three axes (Pitch, Roll, YAW). CH13 could be used to adjust gyro gain by assigning a knob or a slider, changing the sensitivity of the counteracting signal produced by the internal three-axis gyroscope. Automatic level: When the mode is activated, RB-25S will make the model return to level orientation with an internal three-axis accelerometer and three-axis gyroscope on AIL and ELE channels after the sticks are released to neutral. The RUD channel works in stabilization mode only.

Hover: When the mode is activated, RB-25S will make the nose of the model straight up with an internal three-axis accelerometer and three-axis gyroscope on RUD and ELE channels (ELE and RUD inputs are not required). Under this mode, AIL is used to control the rotation of the model and THR adjusts the altitude. AIL channel works in stabilization mode only.

Knife-edge mode: When the mode is activated, RB-25S will roll the plane on a certain side (wing points up) with an internal three-axis accelerometer and three-axis gyroscope on RUD and AIL channels. Thus, AIL inputs are not required. While the mode steering is done with ELE, altitude will be maintained with THR/RUD. ELE channel operates in stabilization mode only. Off: When the mode is activated, RB-25S will transmit the received commands produced by the transmitter to the model without compensating.

How to switch the S.Port/SBUS/FBUS
Enter [RB25 | RB25S Config] and turn to Channel Select the FBUS/S.Port/SBUS for the channel ports. Config 2/3 page

How to set Failsafe
Enter [RB25 | RB25S Config] and turn to the Failsafe Config 3/3 page. The programmed channel will output the settled Failsafe value before losing the control link.

FrSky is continuously adding features and improvements to our products. To get the most from your product, please check the download section of the FrSky website www.frsky-rc.com for the latest updated firmware and manuals FrSky Electronic Co., Ltd. www.frsky-rc.com

Contact us: frsky@frsky-rc.com
Add: F-4, Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: sales4tech@gmail.com

References

• FrSky Top Rated RC Hobby Radio, Receiver and RC Model - Lets you set the limits

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