FrSky RB-35 User manual

External
Switch
INPUT:DC 7.4-26V
External
Switch
INPUT:DC 7.4-26V
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Instruction Manual for FrSky RB-35 & RB-35S
Version
1.0
Introduction
The RB-35/RB-35S builds on the success of the previous trusted Redundancy Bus series by adding many new
features, such as configurable dual power input, dual BEC outputs, overload / current detection, the new ADV
stabilizer (RB-35S), etc. The RB-35/RB-35S system has been designed to meet the needs of users who want the
ultimate flight-safe performance and safety for their RC Models.
Triple Receiver Redundancy & Dual Power Input
RB-35/RB-35S 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 can operate either in Balance or Backup mode. In Balance Mode (default), it
consumes the power line from either power source depending on which has the higher voltage. When switching to the
Backup Mode, the system consumes the power line with the priority that the user selected under the set voltage range.
Dual BEC Outputs & Overload Protection & Current Detection
The RB-35/RB-35S includes a built-in Dual BEC, each XT30 output port can be independently configured to provide
between 5V to 8.4V output. The unit's BEC also can change channel output voltage for ports uses BEC1- VOut1 and
Channels 1-9, and BEC2 - VOut2 and all other Channels and ports. All Channel ports are provided with overload
protection, and in addition, Channels 1-9 support the current detection function.
Advanced Stabilizer (RB-35S)
The RB-35S 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 classic 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 RB-35S output pins are configurable for stabilization and additional
advanced features such as File Sharing, Programmable Parameters, Developer Access, etc.
Diversified Sensor Telemetry
The RB-35/RB-35S also works as an extensive sensor module. It has various built-in sensors including diversified
telemetry. The RB-35S includes high-precision telemetry sensors for monitoring altitude, vertical speed, etc. It can be
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.
SwitchGNDVOUT
Overview
114.4mm
18.7mm 73.4mm
Note: The preset voltage (sync with corresponding
BEC VOut line) for the channel ports cannot
be higher than the voltage the powered device
can capable of.
Sync with the VOut1
BEC voltage setting.
Sync with the VOut2
BEC voltage setting.

Instruction Manual for FrSky RB-35 & RB-35S
Version
1.0
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Specifications
● Dimension: 114.4*73.4*18.7mm (L*W*H)
● Weight: 98g (RB-35) / 99g (RB-35S)
● Number of Configurable Channel Ports: 24 (PWM/FBUS/S.Port/SBUS Out)
● 3 RX Input Ports & 1 LED Indicator Port
● Battery Input Voltage Range: DC7.4-26V (It is recommended to use 3S-6S Li batteries)
(Note: 2S Li Batteries will not have sufficient input supply voltage to reach the 8.4V BEC output configuration.)
● Operating Current: 200mA@12V
● Continuous Current: 2*[email protected] (BEC Outputs)
● Operating Temperature: -20°C~75°C
● Battery Input & BEC Output Connector: XT30
Features
● Dual Power Input & 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-35S)
● Built-in High-Precision Telemetry Sensor (Altitude, Vertical Speed, etc.) (RB-35S)
● Built-in Power Switch Function | Match with Different External Switches (Optional)
● Dual Power Input (Balance / Backup mode)
● Independently Configurable Dual BEC Outputs
(BEC 1: VOut1 & CH1-9 | BEC 2: VOut2 & CH10-24 & all other Ports)
● Overload Protection on Each Channel
● Channel1-9 with Current Detection
● Full Black Box Data Record Function
● Supports External LED Indication (RB-35S)
Setup Guide - Redundant Signal Control with Telemetry
ACCST Receiver Connections vis SBUS
RECEIVER
SBUS Capable Receiver
RECEIVER
SBUS Capable Receiver
S.Port
SBUS OUT
SBUS OUT
Telemetry redundancy is not capable while working with ACCST receivers.
RECEIVER
SBUS Capable Receiver
RECEIVER
SBUS Capable Receiver
S.Port
SBUS OUT
SBUS OUT
ACCESS Receiver Connections vis SBUS
FBUS
FBUS
FBUS
FBUS Capable Receiver
RECEIVER
10
9
FBUS Capable Receiver
RECEIVER
10
9
FBUS Capable Receiver
RECEIVER
10
9
FBUS Capable Receiver Connections
External
Switch
INPUT:DC7.4-26V
External
Switch
INPUT:DC 7.4-26V
RX Input (RX1/RX2/RX3) Port is
SBUS/FBUS/S.Port Auto Recognization
Only the S.Port on the RX1
channel port can be used
to upgrade firmware.
External
Switch
INPUT:DC7.4-26V
External
Switch
INPUT:DC 7.4-26V
RX Input (RX1/RX2/RX3) Port is
SBUS/FBUS/S.Port Auto Recognization
Only the S.Port on the RX1
channel port can be used
to upgrade firmware.
External
Switch
INPUT:DC7.4-26V
External
Switch
INPUT:DC 7.4-26V
RX Input (RX1/RX2/RX3) Port is
SBUS/FBUS/S.Port Auto Recognization
Only the S.Port on the RX1
channel port can be used
to upgrade firmware.

FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Instruction Manual for FrSky RB-35 & RB-35S
Version
1.0
Setup Guide - Dual BEC Voltage Outputs
Dual BEC voltage outputs can be configured from
5-8.4V and supports device working with DC 2*15A in
this range.
● Sync with the VOut1 BEC voltage setting.
● Sync with the VOut2 BEC voltage setting.
Note: The preset voltage (sync with corresponding BEC VOut line) for the channel ports cannot be
higher than the voltage the powered device can capable of.
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.
Backup Mode
When the primary battery is consumed to the limitation of the
preset voltage, the system will allow the backup battery to
join and enter into the balancing of power consumption
across both batteries. In this mode, the consumption limit of
voltage can be set for the primary battery.
Setup Guide - Dual Power Redundancy
[RB35/RB35S Config] → [Battery Mode] Select the battery consumption mode.
[RB35/RB35S Config] → [Slaver Switch Voltage Thro]
Note: 1. Please ensure the battery is plugged into VBAT1 while using the single battery.
2. Please ensure that both battery’s output power is not lower than the power needed for the
connected devices, otherwise there will be insufficient power supply for the devices.

FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Instruction Manual for FrSky RB-35 & RB-35S
Version
1.0
Move to [RB35S Calibration] tool and calibrate the gyroscope sensor
1. The gyroscope of 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 instruction steps below to calibrate the gyrosope sensor;
2. Make sure the stabilization device with the Logo label side facing upwards laying on the desktop, move to the
radio and enter the [RB35S 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) is about
1.000 while placing the device in the corresponding direction, and the deviation could be within ±0.1;
4. The calibration is completed if all the steps above are done.
Gyroscope Sensor Calibration (RB-35S)
[System] → [RB35S Stab] [RB35S Stab] → [Stabilizing] → [On]
Ensure the RB35S stabilization function is enabled.
Basic Step Guides-Stabilization Function (RB-35S)
a. Model Creation & Make sure the connected receiver is bound to the radio;
b. Ensure stabilization is enabled & Calibrate the gyroscope sensor of the device;
c. Servo connection & Build the stabilization device to the model;
d. Set up the mixer channel and radio switches;
e. Determine the [Wing Type] & [Mounting Type];
f. Check the stabilized channel outputs of the receiver in the Auto-Level mode;
g. Check the stick control of the transmitter in the manual mode;
h. Self-Check of the receiver;
I. 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.).

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Servo connection & Build the device to the model (RB-35S)
Number of Channel
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14&CH15
CH16
Corresponding parts
on the model
AIL 1
ELE 1
THR
RUD
AIL 2
ELE 2
AIL 3
ELE 3
RUD 2
AIL 4
ELE 4
User-defined
User-defined
User-defined
User-defined
Full name
Aileron
Elevator
Throttle
Rudder
Aileron
Elevator
Aileron
Elevator
Rudder
Aileron
Elevator
Gyro gain adjustment
Flight modes
Emergency mode
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
direction of airplane model.
Forward
Backward
Attentions
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.
Gyro gain adjustment of CH13: When the the value of CH13 is in the center, the gain is zero. The gain increases
as the value get bigger. Until the value is ±100%, the gain reaches maximum.
Note: RX1/S.Port is used to do the firmware upgrade and parameter settings by the S.Port tool or
ETHOS radio.

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
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 [RB35S 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 aileron and elevator. Also, activating Knife-edge and Hover mode will have the same reaction on the rudder.
1
2
Wing Type
Mounting Type
1
2
Move to the [RB35S Stab] tool, determine the [WingType] & [Mounting Type];
[Gain] and [Offset] configurations of flight modes
Gain - Stab Mode
Gain - Auto-Level Mode
Gain - Hover Mode
1
2
3
4
1
2
3
Gain - Knife Mode
Angle Offset - Auto-Level Mode
Angle Offset - Hover Mode
Angle Offset - Knife Mode
3
2
1
2
1
4
3

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
When the plane is rotated up or down
(Pitch), elevators should have the correct-
ing actions as illustrated.
When the plane is rotated left or right
(Roll), ailerons should have the correcting
actions as illustrated.
When the plane is rotated to left or right
(Yaw), rudders should have the correcting
actions as illustrated.
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.
Note: If the compensation direction is incorrect, please reverse the corresponding channel as
illustrated above through the RB35S Stab tool.
After changing the compensation direction, make sure to check it again on the actual model.

How to set the flight modes (RB-35S)
Quick Mode
It supports stabilization mode, auto-level mode, and manual (Gyroscope is off) mode and 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.
Enable the Quick Mode in the [RB35S] tool.
Note: The default mode of RB-35S 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.
Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Self Check (RB-35S)
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 center position.
2. Move to [
System ] and enter the [RB35S Stab] tool to turn on [Self Check], then the blue LED light turns on. Once the
blue LED starts flashing, we can calibrate the maximum travel of stick channels (excluding the throttle channel).
3. If the calibration is completed, the LED turns off and the servos react left and right to indicate that the calibration
process is completed.
LED Working State
External Blue LED
ON
OFF
Flash
State (Self-check)
In process
Self-check is completed
Max & Min of channels in detecting
The external LED indicator can be connected to the LED port while the gyroscope sensor is enabled.
Note: To do the Self-Check of the stabilization device, please ensure the stabilization function is
enabled. Enter the [RB35S Stab] tool and turn On the [Stabilizing], then quit the [RB35S Stab] tool
and back into this tool again, now the [Self-Check] function is capable to enable.
Do the Self-Check in the [RB35S Stab] tool. [System] → [RB35S Stab] → [Self-Check]

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Conventional Model
Model Configuration Reference (RB-35S)
Layout
CH14 SW-Mid
Off
CH14 (3 pos SW)
CH15 (3 pos SW)
Stabilization
CH14>M+H
(CH14 SW Down)
M-H<CH15<M+H
(CH15 SW Mid)
Automatic level
CH14>M+H
(CH14 SW Down)
CH15>M+H
(CH15 SW Down)
Hover
CH14>M+H
(CH14 SW Down)
CH15<M-H
(CH15 SW Up)
Knife-Edge
CH14<M-H
(CH14 SW Up)
M-H<CH15<M+H
(CH15 SW Mid)
Flight mode
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.
CH14 SW-Mid
Off
CH16 SW Down
Emergency
Mode
CH14 SW Down
&
CH15 SW Mid
Stabilization
CH14 SW Down
&
CH15 SW Down
Automatic
level
CH14 SW Down
&
CH15 SW Up
Hover
CH14 SW Up
&
CH15 SW Mid
Knife-Edge
CH14 (3 pos SW)
CH15 (3 pos SW)
CH16 (3 pos SW)
Flight mode
Conventional Mode
It supports stabilization mode and manual (Gyroscope is off) mode and configured through CH14&15. What’s
more, an
Emergency mode is added to configure automatic level mode default through CH16. The precise
configuration is Written below.
Flight Mode
Off
Stabilization Mode
Automatical Level Mode
Emergency Mode (Automatic Level Mode)
Position
SW Down
SW Mid
SW Up
SW Down
Channel
CH14 (3 pos SW)
CH16 (2 pos SW)

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
Layout of Delta wing / Flying wing Layout of V-tail
Delta wing & Flying wing & V-tail
1. When 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-35S will mix the AIL (CH1) and ELE (CH2) input signal with a fixed
mix percentage automatically.
2. When 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-35S will mix the ELE (CH2) and RUD (CH4) input signal with a fixed mix
percentage automatically.
Stabilization: When the model is activated, RB-35S will compensate with external forces (wind) as soon as
receiving commands from the transmitter. This function is used to enhance the stability of the model on three axis
(Pitch, Roll, YAW). CH13 could be used to adjust gyro gain by assigning a knob or a slider, changing the sensitivi-
ty of the counteracting signal produced by the internal three-axis gyroscope.
Automatic level: When the mode is activated, RB-35S will make the model return to level orientation with internal
three-axis accelerometer and three-axis gyroscope on AIL and ELE channels after the sticks being released to
neutral. RUD channel works in stabilization mode only.
Hover: When the mode is activated, RB-35S will make the nose of the model straight up with 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 adjust the altitude. AIL channel works
in stabilization mode only.
Knife-egde mode: When the mode is activated, RB-35S will roll the plane on a certain side (wing points up) with
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-35S will transmit the received commands produced by the transmitter to the
model without compensating.
Flight mode Stabilization Auto Level Off
CH14 CH14>M+H
(CH14 SW Down)
CH14<M-H
(CH14 SW Up) CH14 SW-Mid
The available flight modes can be assigned to CH14 with a three-position switch.

Version
1.0
Instruction Manual for FrSky RB-35 & RB-35S
FrSky Electronic Co., Ltd. www.frsky-rc.com Contact us : [email protected]
Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China Technical Support: [email protected]
How to switch the S.Port/SBUS/FBUS
Select the FBUS/S.Port/SBUS for the channel ports.Enter [RB35 | RB35S Config] and turn to Channel
Config 2/3 page
Enter [RB35 | RB35S Config] and turn to Failsafe
Config 3/3 page.
The programmed channel will output the setted
Failsafe value before losing the control link.
How to set Failsafe