FrSky TWIN Series - User Manual

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Instruction Manual for FrSky TW R12 & TW SR12 Manual

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

Overview

Specifications

● Frequency: Dual 2.4GHz

● Dimension: 48.5*33*17.9mm (L*W*H)

● 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

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.

33mm

17.9mm

48.5mm

VBATVBAT

INPUT:DC 3.5V~10V

LED

Switch

Upgrade

+AIN

12/24CH Telemetry

T R12

LoRa

FSK

VBATVBAT

INPUT:DC 3.5V~10V

LED

Switch

Upgrade

+AIN

12/24CH Telemetry & Stabilization

T SR12

LoRa

FSK

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Summary

Introduction to TWIN Series Receivers

TWIN Series Receiver Features

Describes the dual 2.4G active protocol and its benefits for resilience and range.

Configurable Channel Ports

Explains assigning ports as PWM, SBUS, FBUS, or S.Port for bidirectional transmission.

ADV Stabilizer Function

Enhanced Stabilization Modes

Offers advanced modes with more programmable channels and flexibility over classical modes.

Registration & Automatic Binding

Binding Procedure Steps

Details the process of registering and binding the receiver to the transmitter.

IMU Mode Configuration

IMU Mode Options

Describes OFF, BASIC, and ADV modes for stabilization module setup.

Basic Step Guides-Stabilization Function

Stabilization Function Setup Guide

Gyroscope Sensor Calibration

Calibration Steps

Details the procedure to calibrate the gyroscope sensor before mounting the device.

Mixer Channel and Radio Switches Setup

Gain and Offset Configurations

Flight Mode Gain;Offset Settings

Self Check (TW SR12)

Self-Check Procedure Steps

Details the steps to perform a self-check on the stabilization device.

OTA Firmware Update

Over-The-Air Update Process

Details the process for updating firmware via OTA.

Failsafe Setting

Failsafe Mode Configuration

Explains the 3 failsafe modes: No Pulses, Hold, and Custom.

The FrSky TW R12 & TW SR12 are advanced receivers designed for RC users seeking enhanced resilience and long-range capabilities in their radio communications. These receivers feature the new stable TW protocol, which simultaneously integrates dual active 2.4GHz frequency bands, differing from traditional active-standby redundancy solutions. This means both 2.4GHz bands are active at the same time, providing robust and reliable signal transmission. The receivers are equipped with three 2.4GHz antennas for optimal performance.

Function Description:

The TW R12 and TW SR12 receivers offer highly configurable channel ports. Each port can be assigned as PWM, SBUS, FBUS, or S.Port. When configured to use the FBUS protocol within the ETHOS system, a single line can connect signal control and telemetry to any FBUS-compatible device (such as XACT servos or ADV Sensors), enabling bidirectional transmission and simplifying model wiring.

Both receivers include a socket for connecting a switch panel, enabling a built-in Power Switch function. They also utilize standard XT30 plugs for safe and efficient power delivery. The channel ports are designed with current overload wires to safeguard connected devices.

The TW SR12 model specifically integrates an ADV Stabilizer function, an upgrade from classical gyroscope stabilization modes. This advanced mode offers more programmable stabilized channels and greater flexibility. The classical stabilization mode is enhanced with 5 additional stabilization channels, allowing for pin mapping to each channel across multiple flight modes like Stabilization, Auto-Level, Hover, and Knife-Edge for airplane models. In the advanced stabilization mode, all output pins are configurable for stabilization, and additional features such as Stab file sharing, programmable parameters, and developer access are available. The ADV stabilizer also incorporates high-precision telemetry sensors for monitoring altitude, vertical speed, and other parameters, offering a significant advantage over standard S series stabilization receivers.

Key Features:

Simultaneous Working Dual 2.4GHz TW Mode: Ensures robust and reliable signal.
Built-in Advanced Stabilization Functions (TW SR12): Enhanced stabilization with more programmable channels.
Built-in High-Precision Telemetry Sensor (TW SR12): Monitors altitude, vertical speed, etc.
Basic Black-Box Data Record Function: Records flight data like RX Reset Case, RSSI, and VFR.
Built-in Power Switch Function: Compatible with different external switches.
Long Control Range: Performance varies based on 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: Versatile communication protocols.
SBUS Out Port: Supports 16CH / 24CH mode.
SBUS In Port: Supports Signal Redundancy.
Over-The-Air (OTA) FW update: Convenient firmware updates.

Important Technical Specifications:

Frequency: Dual 2.4GHz
Dimension: 48.5 * 33 * 17.9mm (LWH)
Weight: 22.5g
Operating Voltage Range: 3.5-10V (Recommended 2S Li-Batteries)
Operating Current: ≤130mA
Continuous Current: ≤20A (power the device)
Instantaneous 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
Antennas: Triple 2.4GHz Antennas
Power Input: Dual XT30 Power Input Connector

Usage Features:

IMU Mode (TW SR12): Offers three modes for stabilization setup:
- OFF mode: Stabilization module is not activated.
- BASIC mode: Enabled by default for basic configurations directly on the radio.
- ADV mode: Supports full configuration via RBmixer programmer on PC, with advanced features like Stab file sharing and programmable parameters.
CaliHorizontal Function (TW SR12): Enables calibration for the horizontal plane, specifically for ADV mode.
Two Independent Stabilizing Functions (TW SR12):
- Stable System 1: Controls CH1-6 stabilization.
- Stable System 2: Controls CH7-11 stabilization.
- Settings for both systems are independent, requiring separate calibration and self-check.
Gyroscope Sensor Calibration (TW SR12): Essential for accurate stabilization. Involves placing the device on a flat surface and calibrating all 6 surfaces (top, bottom, pins up, pins down, legible lettering right, not legible lettering left) to ensure axis values are approximately 1.000 (±0.1).
Servo Connection & Build: Servos are connected according to a channel list, with specific channels assigned to Aileron, Elevator, Throttle, Rudder, and user-defined functions like Gyro gain adjustment, Flight modes, and Emergency mode. The receiver antenna should face the nose direction, with receiver pins backward.
Gyro Gain Adjustment (CH13): The gain is zero at the center value of CH13 and increases with the value, reaching maximum at ±100%.
WingType & Mounting Type Configuration: Configurable within the [SRX Stable] tool.
Gain and Offset Configurations: Adjustable for Stab Mode, Auto-Level Mode, Hover Mode, and Knife Mode.
Inspection of Flight Attitude: Crucial for flight safety. In Auto-Level mode, AIL and ELE should show strong deflection. Knife-edge and Hover modes will show the same reaction on the rudder. Correcting actions of ailerons, elevators, and rudders should align with the plane's rotation (Roll, Pitch, Yaw).
High PWM Speed Mode: Can be activated in receiver options. Warning: Only for digital servos; using with analog servos may cause overheating and damage.
SBUS Channel Mode: Selectable between SBUS-16 and SBUS-24 modes.
FBUS/S.Port/SBUS Out/SBUS In Switching: Configurable for channel ports.
Flight Modes (TW SR12):
- Quick Mode: Supports stabilization, auto-level, and manual (gyro off) modes via CH14. An emergency mode is added via CH16. Note: No Knife Edge or (3D) Hover Mode in Quick Mode.
- Conventional Mode: Supports stabilization, auto-level, hover, and knife-edge modes via CH14 & CH15.
- Hover: Model's nose points straight up, AIL controls rotation, THR adjusts altitude.
- Knife-edge: Plane rolls on its side, ELE controls steering, THR/RUD maintains altitude.
- Off: Transmits commands without compensation.
Model Configuration Reference: Provides layouts and switch positions for Conventional, Delta wing/Flying wing, and V-tail models. For Delta wing/Flying wing and V-tail, the TW SR12 automatically mixes AIL/ELE or ELE/RUD signals.
Failsafe: Three modes available:
- No Pulses Mode: Receiver produces no pulses on PWM channels upon signal loss.
- Hold Mode: Receiver continues to output last positions before signal loss.
- Custom Mode: Pre-set to required positions for lost signal.
- A 9-second wait is required for failsafe settings to take effect.

Maintenance Features:

Black Box Data Record Function: Allows users to retrieve flight data for analysis and troubleshooting.
Over-The-Air (OTA) FW Update: Simplifies firmware updates without physical connection, ensuring the receiver stays up-to-date with the latest features and bug fixes.
Range Check: A pre-flight range check is recommended before every flight to detect potential signal loss due to environmental factors. This mode reduces effective distance to 1/30 for testing.