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FrSky RB-25 Instruction Manual
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FrSky RB-25 Instruction Manual

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Introduction
The RB-25/RB-25S builds on the success of the previous trusted Redundancy Bus Series by adding new
advanced features combined with a compact new design which 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 sources 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 airplane 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, and 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 the 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 enables flexible options on how the power can be switched on/off without the need to
plug/unplug the battery connections.
Overview
16mm
Switch
GND
VOUT
Specifications
● Dimension: 53*40*16mm (L*W*H)
● 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
FrSky Electronic Co., Ltd.
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: sales4tech@gmail.com
Instruction Manual for FrSky RB-25 & RB-25S
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www.frsky-rc.com
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Contact us : frsky@frsky-rc.com
Version
1.0

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Summary of Contents for FrSky RB-25

  • Page 1 Instruction Manual for FrSky RB-25 & RB-25S Introduction The RB-25/RB-25S builds on the success of the previous trusted Redundancy Bus Series by adding new advanced features combined with a compact new design which meets the needs of users who want a flight-safe system built in a smaller size unit.
  • Page 2 Version Instruction Manual for FrSky RB-25 & RB-25S ● 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 ●...
  • Page 3 Version Instruction Manual for FrSky RB-25 & RB-25S 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.
  • Page 4 Version Instruction Manual for FrSky RB-25 & RB-25S 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...
  • Page 5 Version Instruction Manual for FrSky RB-25 & RB-25S Servo connection & Build the device to the model (RB-25S) Connect the servos to the ports of the stabilization device according to the Channel List. Forward Note: Please make sure the side with the External Switch Port forwards the nose direction of airplane model, and with a Single Screw Tab backward.
  • Page 6 Version Instruction Manual for FrSky RB-25 & RB-25S Move to the [RB25S Stab] tool, determine the [WingType] & [Mounting Type]; Wing Type Mounting Type [Gain] and [Offset] configurations of flight modes Gain - Stab Mode Gain - Knife Mode Gain - Auto-Level Mode...
  • Page 7 Version Instruction Manual for FrSky RB-25 & RB-25S When the plane is rotated left or right (Roll), ailerons should have the correcting actions as illustrated. When the plane is rotated up or down (Pitch), elevators should have the correcting actions as illustrated.
  • Page 8 Version Instruction Manual for FrSky RB-25 & RB-25S Self Check (RB-25S) 1. Put the throttle to 0, and keep the other channels in the center position. 2. Move to [System] and enter the [RB25S Stab] tool to turn on [Self Check], then the blue LED light turns on.

  • Page 9: Conventional Mode

    Version Instruction Manual for FrSky RB-25 & RB-25S Channel Position Flight Mode SW Down None CH14 (3 pos SW) SW Mid Stabilization Mode SW Up Automatical Level Mode CH16 (2 pos SW) SW Down Emergency Mode (Automatic Level Mode) The stabilization devices fit multiple types of models, the model type can be changed via different tools (like STAB RX.lua, ETHOS lua tool, etc.).
  • Page 10 Version Instruction Manual for FrSky RB-25 & RB-25S Delta wing & Flying wing & V-tail Layout of Delta wing / Flying wing Layout of V-tail The available flight modes can be assigned to CH14 with a three-position switch. Flight mode...
  • Page 11 Version Instruction Manual for FrSky RB-25 & RB-25S How to switch the S.Port/SBUS/FBUS RB25S Config 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 RB25S Config...

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Rb-25s