RadioMaster T8 Pro User manual

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T8 PRO
Instruction manual
Version：1.0

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WWW.RADIOMASTERRC.COM
TABLE OF CONTENTS
1. Overview.......................................................................................... Error! Bookmark not defined.
1.1. Introduction...................................................................... Error! Bookmark not defined.
1.2. Safety instructions.......................................................... Error! Bookmark not defined.
1.3. Manual and Firmware download...............................Error! Bookmark not defined.
1.4. Important note on firmware....................................... Error! Bookmark not defined.
1.5. Radio system overview.................................................................................................. 5
1.6. Power supply and charging precautions................ Error! Bookmark not defined.
1.7. Note about this guide................................................... Error! Bookmark not defined.
1.8. Specifications....................................................................Error! Bookmark not defined.
1.9. Warranty and Repair...................................................... Error! Bookmark not defined.
1.10. Firmware Update and OpenTX Information....... Error! Bookmark not defined.
1.11. Disclaimer......................................................................................................................... 9
1.12. Legal status and copyright........................................Error! Bookmark not defined.
2. OpenTX Companion software（OpenTX companion）................................................ 10
2.1. Software Download and Installation....................... Error! Bookmark not defined.
2.2. Use Companion software to update radio firmware........................................ 13
3. First boot........................................................................................................................................ 16
3.1. Battery voltage calibration.......................................... Error! Bookmark not defined.
3.2. Gimbal calibration......................................................................................................... 18
3.3. Default gimbal mode and channel output order............................................... 20
4. Radio menu................................................................................................................................... 21
4.1. Main interface................................................................................................................. 21
4.1.1. Reset, Status and About................................................................................. 21
4.2. System settings...............................................................................................................22
4.3. Model selection.............................................................................................................. 24
4.3.1. Create model and model selection........................................................... 24
4.4. Model settings（Model Setup）.............................................................................. 25

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4.4.1 Model settings.................................................................................................... 25
4.4.2. Flight Mode.........................................................................................................26
4.4.3. Global Variables.................................................................................................29
4.4.4. Inputs.................................................................................................................... 30
4.4.5. Mix control.......................................................................................................... 33
4.4.6. Output...................................................................................................................36
4.4.7. Curves................................................................................................................... 37
4.4.8. Logic switches.................................................................................................... 39
4.4.9. Special Functions.............................................................................................. 42
4.4.10. Custom Scripts................................................................................................ 45
4.4.11. Digital Transmission and Telemetry........................................................ 46
4.4.12. Customized Display....................................................................................... 47

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1. Overview
1.1. Introduction
Thank you for purchasing the RadioMaster T8 PRO 2.4GHz transmitter. This
versatile transmitter is designed for both beginner and professional pilots alike. In
order to operate this product in a safe and effective manner, please carefully read
this manual prior to use. The information contained in this manual is subject to
change without notice.
The T8 Pro is optimized for fixed winged aircraft, gliders, helicopters and
multirotor aircraft. The model type can be selected according to the aircraft used,
and various setups and mixes can be programmed and used to suit a wide variety of
applications.
-Radiomaster team
1.2. Safety instructions
Many radio-control models are equipped with powerful motors and sharp
propellers. Use caution when working on or operating models. When performing
assembly or maintenance, make sure that the model is powered off and the
propellers are removed.
Do not operate the T8 Pro radio control system under the following conditions:
• Under severe weather or strong wind conditions, such as rain, hail, snow,
storm or harsh electromagnetic environmental conditions.
• Under any circumstances where visibility is limited.
• In areas where people, property, high-voltage power lines, public roads,
vehicles or animals may be present.
• If you feel tired or unwell, or under the influence of drugs or alcohol.
• If the radio control or model appears to be damaged or not working properly.
• In areas where 2.4GHz interference is high or where 2.4GHz radios are
prohibited.
• When the battery voltage is too low to use.
• In areas where local regulations prohibit the use of aviation models.

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1.3. Manual and Firmware Download
The T8 Pro comes pre-installed with standard OpenTX firmware.
To download the latest software manual, visit the RadioMaster website:
https://www.radiomasterrc.com
To download the latest firmware for your T8 Pro radio control, visit the OpenTX
website: https://www.open-tx.org
1.4. Important note on firmware.
The T8 Pro comes pre-installed with the most stable firmware at time of
manufacture. Please only update firmware if you are experienced and confident in
updating your system firmware, update only the firmware intended for your radio.
Incorrect updates may render the radio control inoperable which is not covered
under warranty.

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1.5. Radio System Overview

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1.6. Important note on `Power and charging precautions.
The T8 Pro is powered by an internal 3.7V 1000mAh Lipo battery, which has a nominal
voltage of 3.7V and is fully charged at 4.2V. Charging is performed via an included USB-
C cable.
Please check the battery voltage periodically, do not charge if the transmitter was
exposed to moisture or damaged in any way. Charge only on non-flammable surfaces,
do not charge unattended.
Battery charge status and charge state
There are 5 LED charge indicators located on the bottom of the transmitter. When the
LEDs cycle from left to right, this indicates that the T8 Pro is charging. Each LED
indicates 20% charge, when all 5 LEDs are illuminated, the transmitter is fully charged.
When the transmitter needs recharging, all 5 LEDs will flash- please land your aircraft
immediately and charge the transmitter battery.
Status
LED indication
Charge state
The 5 LEDs signify 0-100% charge state, with each
representing 20% charge.
◯ ◯ ◯ ◯ ◯
20% 40% 60% 80% 100%
Charging
The LEDs will flash sequentially from left to right
while charging. All 5 LEDs will remain illuminated when
charging is complete.
RadioMaster is not responsible for any adverse consequences caused the use or
misuse of this device.
1.7. Note about this guide.
This guide covers basic information about your radio. OpenTX software is very
powerful and has a large number of programming and mixing functions. Please visit

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the site below for a comprehensive software installation guide for more detailed
instructions https://www.open-tx.org
1.8. Specifications
Exterior size： 160*130*45mm
Weight： 218g（Excluding battery）
Frequency： 2.400GHZ-2.480GHZ
RF Module： Single chip multi-protocol（CC2500）
Supported protocols： D8 / D16 v1 FCC / D16 v1 LBT / D16 v2 FCC / D16 v2 LBT
Transmit power： Maximum 20dbm
Antenna gain： 2db
Effective distance： > 1km @ 22dbm
Open sourced firmware： OpenTX T8 Pro version
DIY Multiprotocol TX Module (RF)
Channels：Maximum 8 (Receiver dependent)
Display： 128*64 Monochrome LCD (removable)
Gimbal： Potentiometer
1.9. Warranty and Repair
If you experience any problems with your radio-control hardware, please keep
proof of purchase and contact the retailer where you purchased T8 Pro. Also visit
https://www.radiomasterrc.com/ for technical support or to find a repair agent in your
region.

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1.10. Firmware Update and OpenTX Information
For the latest news and information on OpenTX firmware from development
team, please visit the OpenTX website at https://www.open-tx.org. If you enjoy using
OpenTX firmware please consider supporting the development team with a donation.
1.11. Disclaimer
OpenTX is an open source firmware. No warranty or implied warranty is given for
the quality and reliability of this firmware. If not handled properly, the RC model can
cause serious injury or even death. If you decide to use OpenTX firmware, you are
solely responsible for your model. Any injury or damage caused by using OpenTX
firmware
The authors of OpenTX and RadioMaster assume no responsibility. Use with
caution.
1.12. Legal status and copyright
This project is free software: you can redistribute and / or modify it in accordance
with the GNU General Public License Agreement, V3 version agreement, or (optionally)
an updated version agreement issued by the International Free Software Association.
You should receive a copy of the GNU General Public License Agreement for the
OpenTX project. If not, see www.gnu.org/licenses.
OpenTX is open source firmware for RC radio controllers. The firmware is highly
configurable and has more features than traditional radios. Daily feedback from
thousands of users ensures continuous firmware updates as well as stability and
quality.
The release of OpenTX firmware hopes that it will benefit the public, but it has no
warranty; it does not include implied commercial licenses or applicability for a special
purpose. For more details, see the GNU General Public License Agreement.
OpenTX source files and more can be found at https://github.com/opentx/opentx.

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2. OpenTX Companion software (OpenTX Companion)
The OpenTX Companion radio control support software is used for many different
tasks, such as loading OpenTX firmware to the radio, backing up model settings,
editing model settings, and running the radio simulator.
You can run OpenTX Companion software on multiple computer platforms.
OpenTX Companion software supports common systems such as Windows, Mac OS X,
and Linux. Even without a radio control, you can experience all the functions and
settings of the radio control in a computer simulator.
You can get the latest version of OpenTX Companion software here:
http://www.open-tx.org/
2.1. Software Download and Installation
1. Download the latest version of OpenTX Companion software from
http://www.open-tx.org/.
2. Install OpenTX Companion software (take windows version 2.3.6 as an example)
Double-click the installer companion-windows-2.3.6.exe.

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At this point, the OpenTX Companion software installation is complete. Please
continue to follow the instructions below to continue setting the software to match
the RadioMaster T8 Pro radio controller:

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2.2. Using Companion software to upgrade radio controller firmware
After the above settings are completed, click the firmware download button to
download the firmware.
Note: The RadioMaster T8 Pro radio control is pre-installed with stable and
reliable OpenTX firmware when it leaves the factory. If there is no special need,
please do not update the firmware unnecessarily. Incorrectly flashing firmware may
leave your radio inoperable. Only proceed with updates if you are confident in your
understanding and ability to do so.
If you are required to update the firmware to for functional upgrades, please
carefully follow the instructions below. Before updating the firmware, make sure
that all steps are correct and operate carefully to ensure that your radio control is
successfully updated.
If not required, please skip this section.
Before writing the firmware, please make sure that the radio control is turned
off, and plug in the supplied USB-C (TYPE-C) cable. The following device name will
appear in the computer device manager:
Before writing the firmware for the first time, you need to replace the STM32
BOOTLOADER driver to ensure that the OpenTX Companion software can recognize

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this hardware type and write the firmware correctly. The replacement method is as
follows:
Download the latest version of the universal driver replacement software
Zadig.exe from https://zadig.akeo.ie/
A. In the Windows system, right-click Zadig-2.4.exe and select Run as
administrator
B. In the Zadig software, select Options-> List All Devices to view the device list
C. Drop-down list and find STM32 BOOTLOADER device
D. Click the Replace Driver button (if the driver has been installed before,
Reinstall Driver will be displayed) to replace / install the driver. After the driver
installation is completed, you can use OpenTX Companion to write the firmware to
the radio controller correctly.

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At this point, the firmware of the radio control is successfully written. Unplug
the USB-C (TYPE-C) and proceed to the first boot procedures.

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3. First boot
Press and hold the power button to boot. Before entering the main interface, the
system will check the position of the throttle stick and switch and other startup
conditions. If the startup conditions are not met, there will be a corresponding error
prompt. You need to clear it or press any key to move forward
Throttle warning: This is a warning that the throttle is not at the lowest position
when the radio is turned on. You can set the throttle stick to the lowest position or
press any key to skip. You can also turn off the throttle state option in the MODEL
SETUP menu. Throttle alarm.
Switch warning: This is a warning that a switch on the radio -control is not in the
default position. (The default setting is that all switch directions are up ↑)
Failsafe not set warning: This is a warning that the radio-control fail-safe
protection is not set.

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SD card warning: If the SD card file version used does not match the radio
controller firmware version, this warning will appear. The figure requires 2.3V0026
version (the SD card content needs to be updated when upgrading the firmware).
First page: Below is an example of the default first page of the system, you can
customize the display elements in the page as required.

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31. Calibrating Gimbals
Each T8 Pro is calibrated in the QC process however due to varying shipping
conditions we suggest to calibrate your radio before first use.
A. In the system settings, scroll to the HARDWARE page, select the Calibration
item, and press OK to enter the settings.
B. Follow the text prompts at the top for calibration. The first step prompts, press
the confirmation key to start
C. In the second step, place all the gimbals, knobs, and side sliders in the
middle position. The system obtains the midpoint value, and then press the
confirmation key to continue to the next step.
D. For the third step, move all the gimbals, knobs, and side sliders of to their
respective maximum and minimum positions. The system will record the maximum

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and minimum values. After all the above steps are completed, press Enter key to
complete the calibration, and the system automatically returns to the previous page.

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3.2. Set the default Gimbal mode and the default channel
output order.
In the system settings, turn the page to the RADIO SETUP page, select the scroll
wheel to the bottom of the page, you can see
Rx channel ord (Receiver channel order)
Mode（Gimbal mode）
Because the channel input order of the built-in multi-protocol transmitting
module of the RadioMaster T8 Pro radio control is AETR, in the Default channel order
option, be sure to select the AETR order
The Mode (gimbal mode) can be selected according to your personal
preferences:
Mode 1 (right-hand throttle / Common in Asian and some European markets)
or
Mode 2 (left-hand throttle / Common in North American markets)
The icons on the right from left to right indicate the names of the gimbals
corresponding to the position of the gimbal on the radio control.
Left gimbal horizontal / Left gimbal vertical / Right gimbal vertical /Right gimbal horizontal
Rud（Yaw）/ Thr（Thrust）/ Ele (Pitch) / Ail（Roll）