FrSky TW R12 & TW SR12 Protocol Receiver Instruction Manual

Instruction Manual for FrSky
TW R12 & TW SR12 Manual

Introduction

TWIN series receiver features a new stable TW protocol that benefits from simultaneously integrating dual active 2.4G frequency bands. The TW active- active protocol is different from the general active-standby redundancy solutions, with the TW protocol, dual 2.4G frequency bands are active on the TW series receiver at the same time.
This receiver is equipped with 3×2.4G antennas and designed for RC users who want to benefit from resilience and long-range in their radio communications.
The configurable channel ports on TW R12 & TW SR12 receivers are a big feature, each channel port can be assigned as PWM, SBUS, FBUS, or S.Port. By setting the port to use FBUS protocol in the ETHOS system, the signal control and telemetry can be connected to any device (XACT servos, ADV Sensors, etc.) that supports FBUS protocol through only one line to achieve bidirectional transmission, also simplifying the model build using fewer wires.
TW R12 & TW SR12 provides a socket that can be used to connect the switch panel to enable the built-in Power Switch function, and both receivers use a set of standard XT30 plugs which also provides a safe and efficient way to provide power. By utilizing together with current overload wires on the channel ports, the connected device can be safeguarded.
ADV Stabilizer
The TW SR12 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 output pins are configurable for stabilization and additional advanced features such as Stab file sharing, programmable parameters, and developer access, etc.
The advanced stabilizer feature incorporates high-precision telemetry sensors to monitor altitude, vertical speed, etc. This ADV feature is an additional benefit compared to using a regular S series stabilization receiver.

Overview

Warning : Do not plug the additional power supply through other ports (Channel, S.Port, SBUS, FBUS, etc.) while using the battery via XT30 battery connectors to power the receiver.

Specifications

• Frequency: Dual 2.4GHz
• Dimension: 48.53317.9mm (LWH)
• Weight: 22.5g
• Operating Voltage Range: 3.5 -10V (Recommend 2S Li-Batteries)
• Operating Current: ≤130mA
• Continuous Current: ≤20A (power the device) | Instaneous Current: ≤40A (power the device)
• Voltage Measurement Range via AIN (External device): 0-35V (Battery Voltage Divider Ratio: 1:10)
• Compatibility: Twin series radio & TW protocol capable RF module
• Triple 2.4GHz Antennas
• Dual XT30 Power Input Connector

Features

• Simultaneous Working Dual 2.4G TW Mode

• Built-in Advanced Stabilization Functions (TW SR12)

• Built-in High-Precision Telemetry Sensor (Altitude, Vertical Speed, etc.) (TW SR12)

• Basic Black-Box Data Record Function

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

• Long Control Range (Range varies based on the RF Power settings.)

• 12 Configurable Channel Ports
  – CP1: PWM / SBUS OUT / FBUS / S.Port / SBUS IN
  – CP2-12: PWM / SBUS OUT / FBUS / S.Port

• FBUS / S.Port

• SBUS Out Port (Supports 16CH / 24CH mode)

• SBUS In Port (Supports Signal Redundancy)

• Over-The-Air (OTA) FW update

LED State

Registration & Automatic Binding

Follow the step below to finish the registration & binding procedure:

1. For TWIN X Lite as an example, enter into the Model, select RF System, turn on the internal module, select status [ON] and TW MODE (Type), then select [Register].
2. Connect the battery to the receiver while holding the button on the receiver. The RED LED and GREEN LED on the receiver will be on, indicating into the [Reg] status.
3. When it shows the Register ID, RX name and UID, click [Register]. The RED LED and GREEN LED on the receiver will flash, and the transmitter displays [Registration OK ].
4. Power off the receiver.
5. Move the cursor to select any one of the 3 receivers and press [Bind].
6. Connect the battery to the receiver.
7. Select the RX, the GREEN and BLUE LED will keep lit, then the transmitter displays [Bind successful].

Note : Once the receiver is registered, the button is not needed anymore in the binding process.

IMU Mode

The devices with ADV featuresoffers three modes below to setup the stabilization module.

•  OFF mode: The stabilization module is not activated in the mode.
• BASIC mode: The mode is enabled by default can do the basic configurations directly on radio.
• ADV: The mode supports full configuration of stabilization mode with RBmixer programmer on PC.

Note : Selecting the BASIC mode for the normal stabilization usages. For accessing more flexiablities of ADV stabilizaition feature, please use the RBmixer program to configure the stabilization module.

CaliHorizontal Function

Enable the CaliHorizontal mode can do the calibration for the horizontal plane.

Note : This “CaliHorizontal” function is only activated for ADV mode horizontal calibration. It doesn’t work while using the basic mode.

Two independent stabilizing functions

Option 1: The “Stable System 1” allows turning on/off the first group of stabilization channels (CH1-6);
Option 2: The “Stable System 2” allows turning on/off the second group of stabilization channels (CH7-11);.

Note : Pressing the center button of the left navigation menu buttons, users can switch to the second configuration page of stabilization channels.

Note : The settings for Stable System 1 and 2 are independent, Stab calibration and self-check should be completed for both stab systems.

Basic Step Guides-Stabilization Function (TW SR12)

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 (Place the decompressed folder in the root directory of the [Scripts] folder on the memory card to use.)

Gyroscope Sensor Calibration (TW SR12)

Ensure the TW SR12 stabilization function is enabled.

Move to [SRX 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 [SRX 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.

Servo connection & Build the device to the model (TW SR12)

Connect the servos to the ports of the stabilization device according to the Channel List.
Note: Please make sure the receiver antenna forwards the nose direction, and with receiver pins backward.

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.
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.
Move to the [SRX Stable] 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|   1.Gain – Knife Mode
2.Angle Offset – Auto-Level Mode
3.Angle Offset – Hover Mode
4.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 [SRX Stable] 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.

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.When the plane is rotated to 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 [SRX Stable] 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 (TW SR12)

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

How to set the flight modes (TW SR12)
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.

Note: The default mode of TW SR12 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.

Note : Due to the RSSI data from the R9 receiver using the same channel (CH16) as the Emergency Mode in Quick Mode of New stabilization receivers (Archer Plus, TD, and TW stabilization receivers), so while using the R9 series as the redundant receiver, please make sure the Quick Mode is entirely disabled (NOT just in “Off” status) (1.0.5 or older versions).

Enable the Quick Mode in the [SRX Stable] tool.

Note : The Emergency Mode is canceled from the firmware version 1.0.6 or later versions, the Quick Mode does not need to be disabled while using the R9 series receivers as the redundant receiver.

Conventional Mode

It supports stabilization mode and manual (Gyroscope is off) mode and configured through CH14&15. The precise configuration is Written below.

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)

Model Configuration Reference (TW SR12)

Conventional Model

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)

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 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. TW SR12 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. TW SR12 will mix the ELE (CH2) and RUD (CH4) input signal with a fixed mix percentage automatically.

Stabilization : When the model is activated, TW SR12 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 sensitivity of the counteracting signal produced by the internal three-axis gyroscope.
Automatic level: When the mode is activated, TW SR12 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, TW SR12 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, TW SR12 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, TW SR12 will transmit the received commands produced by the transmitter to the model without compensating.

How to Switch High PWM Speed mode

1. The factory default setting is OFF .
2. To go to the receiver [Options], select On to active high speed mode .

Warning : High PWM speed mode is only applied for digital servos. Turn off High PWM Speed mode when using analog servo, otherwise servos will get hot and may burn out.

How to switch the S.Port/SBUS OUT/SBUS IN/FBUS

How to switch SBUS channel mode

Black Box

Black box records flight data, e.g, RX Reset Case, RSSI, VFR and so on. For TANDEM X20 as an example, to get flight data, please go to RF System-[Set]-[Flight Data Record].

About OTA function

Go to the [File manager], and select the FW, press the enter button, select [Flash RX by int.OTA]. Power on the receiver, select the RX, go to the [ENTER], complete the flash process, the transmitter will display [Success].
Wait for 3 seconds, the receiver works properly at the moment.
Note: Please do not do the binding operation in the near range while the firmware upgrading in progress.
Note: Update the firmware after the receiver getting registered (OTA).

Range Check

A pre-flight range check should be done before every flight, in case the signal loss is caused by the reflection of the signal by the nearby metal fence or concrete, and the shading of the signal by buildings or trees during the actual flight.

1. Place the model at least 60 cm (2 feet) above the non-metal contaminated ground (such as on a wooden bench). The receiving antenna should be in a vertical position.
2. Ener the ETHOS system, move to the “RF System”, scroll the Encoder to select “RANGE” mode and press Encoder. In range check mode, the effective distance will be decreased to 1/30.

How to set Failsafe

There are 3 failsafe modes when the setting is enabled: No Pulse, Hold, and Custom mode.

• No Pulses Mode: On loss of signal, the receiver produces no pulses on any pwm channel. To use this mode, select it in the menu and wait 9 seconds for the failsafe to take effect.
• Hold Mode: The receiver continues to output the last positions before the signal was lost. To use this mode, select it in the menu and wait 9 seconds for the failsafe to take effect.
• Custom Mode: Pre-set to required positions on the lost signal. Move the cursor to the failsafe mode of the channel and press Encoder, then choose the Custom mode. Move the cursor to the channel you want to set failsafe On and press Encoder. Then rotate the Encoder to set your failsafe for each channel and short-press the Encoder to finish the setting. Wait 9 seconds for the failsafe to take effect.

Note:

• If the failsafe is not set, the model will always work with the last working status before the signal is lost. That could cause potential damage.
• When the failsafe is disabled on the RF module side, the receiver defaults to Hold mode.
• When in No Pulses Mode, do not set the Failsafe to No Pulses Mode for the SBUS port as it will keep the signal output continuously，Please set “Hold” or “Custom” mode for the SBUS port.

FCC STATEMENT

1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired operation.

2. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate transmitter frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to transmitter communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to transmitter or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced transmitter/TV technician for help.

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 update 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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