RadioMaster TX12MKII 2.4GHz Remote Control System - Quick Start Guide

Introduction

Thank you for purchasing the RadioMaster TX12MKII 2.4GHz remote control system. This system is versatile and suitable for both beginners and professionals. Please read this manual carefully before use to ensure correct and safe operation. This manual may change over time due to ongoing software and hardware improvements.

The TX12MKII remote control is designed for various types of aircraft (fixed-wing, gliders, helicopters), cars, boats, robotics, and multi-rotor aircraft. It utilizes the powerful EdgeTX operating system.

-The RadioMaster Team

Safety Information

Remote-control models often have powerful motors and sharp propellers. Exercise caution during use, assembly, or maintenance. Always disconnect power and remove propellers before performing any work on the model.

Never operate the TX12MKII radio system under the following conditions:

• Severe weather (rain ?️, hail ?, snow ❄️, storms ⛈️) or strong winds ?.
• Electromagnetic environments.
• Limited visibility ?️.
• In proximity to other people, property, high-voltage power lines, public roads, vehicles, or animals.
• When feeling unwell ? or under the influence of drugs or alcohol ?.
• If the radio system or model is damaged ⚠️ or shows signs of interference ⚡.
• In areas with high 2.4GHz interference ? or where 2.4GHz radios are prohibited.
• When the transmitter/receiver battery is low ?.
• In areas where local regulations prohibit R/C aircraft use.

Important Notes

Antenna Installation

IMPORTANT: Install the provided antenna ? in the top of the radio BEFORE installing batteries and turning it on. DO NOT operate the radio without the antenna installed and the internal RF module powered on, as this will damage the internal RF module and void the warranty.

Manual & Firmware Download

The TX12MKII comes pre-installed with factory-approved EdgeTX firmware. For the latest software manual and firmware information, please visit the RadioMaster website:

www.radiomasterrc.com

Further firmware information is available at:

• EdgeTX: www.edgetx.org
• ExpressLRS: www.expresslrs.org
• Multi Protocol Module: www.multi-module.org

Batteries & Charging

The TX12MKII is powered by two 3.7V 18650 Lithium-Ion cells ? and is charged via the built-in USB-C port. The charging circuitry is designed exclusively for charging two 3.7V Lithium-Ion batteries. The nominal voltage is 3.7V, and the maximum charging voltage is 4.2V.

DO NOT charge 3.6V LiFe or 3.6V 18650 Lithium-Ion packs with the onboard charger. Using the wrong battery chemistry or polarity can cause permanent damage to the PCB and may lead to fires ?.

Always check battery voltage and condition regularly. Never charge unattended. Charge in a safe area away from combustible materials. Do not charge if the remote control is wet or damaged. Ensure correct polarity when charging.

RadioMaster is not responsible for any adverse consequences resulting from the use or misuse of this product.

Model & Protocol Selection

The TX12MKII features an internal CC2500 single-chip multi-protocol module (depending on package). For the latest list of compatible protocols, visit the multi-module website.

New protocols are constantly updated and added to firmware. Some may require firmware upgrades.

Multi-protocol Module Setup

To enter model settings, long-press the MDL button. On the SETUP page, select MULTI, then choose the desired protocol from the sub-options. The system will automatically activate the corresponding RF module.

• Bind [BND]: Used to start the binding process ?.
• Range [RNG]: Reduces power to 1/30 for remote-control distance testing ?.

ATTENTION (4in1/CC2500 Users): Your receiver may require frequency tuning. Follow this link for instructions: www.multi-module.org/using-the-module/frequency-tuning

ELRS Version

TX12MKII ELRS units have an internal ELRS module. For optimal performance, enable Dynamic Power and use a 500Hz or lower packet rate to extend battery life and minimize heat generation.

Bind Instructions

Follow these steps to bind your receiver:

1. TURN OFF the transmitter ?.
2. Cycle power to the receiver 3 times. The receiver LED will flash twice, indicating bind mode.
3. TURN ON the transmitter ?️. Long-press the SYS button and navigate to TOOLS, then select ExpressLRS LUA. Scroll to [Bind] and press Enter.
4. The receiver LED should now be solid, indicating a successful bind.

Warranty & Repair

If you encounter any hardware issues with your remote control, please keep your proof of purchase and contact the retailer. You can also visit the warranty support page:

www.radiomasterrc.com/contact

Specifications

Diagram Descriptions

Transmitter Layout (Front): The front of the RadioMaster TX12MKII features a 2.4 GHz antenna, Trainer Port, SE 3-Position switch, SB 3-Position switch, SA Button, S1 Dial, Speaker, Left Gimbal, Power Button, Lanyard Loop, SYS Button, RTN Button, PAGE> Button, PAGE< Button, and TELE Button. It also includes a USB-C port, LCD Screen, and SD Card Slot. The voltage range is 6.6-8.4V DC. Other controls include SF 3-Position switch, SC 3-Position switch, SD Button, S2 Dial, Right Gimbal, 1.5mm HEX tool access, T1-T4 Trim Buttons, MDL Button, and Menu Wheel. Batteries are not included.

Transmitter Layout (Back/Top): The back shows the Module bay. The top features the Gimbals, which have adjustment points for self-centering & throttle adjustment and spring tension adjustment. Grips are located on the sides, and a Battery bay is at the bottom.

Regulatory Information: The document includes an EU Simple Declaration of Conformity stating compliance with EU directives (2014/53/EU) and FCC information regarding compliance with Part 15 of the FCC rules. It also displays CE and FC markings.