Foxtech D04 User Manual
D04
Multi-link Signal Relay
2
Contents
Disclaimer
Product Introduction
Packing List
Product instructions
Radio Power On and Off
Status Indicator Instructions
Ground Unit and PC Communication
Wireless network selection and setup
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Ground Unit Indicator
Receiver Indicator
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WIFI Wireless Network Connection
BLE Wireless Network Connection
Datalink Link Communication Test
Radio Parameter Configuration
Ground Unit Battery Charging
Radio Alarm
Failsafe Setting
WiFI Module Parameter Setting
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BLE Module Parameter Setting
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5
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9
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11
12
13
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15
20
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26
27
28
29
34
BLE and WIFI Modules are Restored to Factory Settings
Check the Radio System Firmware Version
Firmware Upgrade Steps
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Ground unit Firmware upgrade
Receiver firmware upgrade
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FAQ
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37
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43
3
Disclaimer
Thank you for purchasing the D04 Dual Link Radio (hereafter referred to as "D04").
Please use D04 according to local radio regulations. Please read this statement
carefully before using it. Once used, it is deemed to be an endorsement and
acceptance of the entire contents of this statement. Please strictly follow the
instructions to install and use the product. FOXTECH Co., Ltd. will not assume any
legal responsibility for any result or loss caused by improper use, installation,
assembly and modification of the user.
Product Note:
1. D04 is used as the ground end (hereinafter referred to as "ground end") in
conjunction with the sky end R20 (hereinafter referred to as "sky end" or "airborne
end").
2. Built-in 12V battery on the ground (18s battery for 3s), external power input
DC7.4 - 12V (lithium battery 2s - 3s), please supply power to the radio in strict
accordance with the specifications.
3. Be sure to install the antenna before powering up to avoid damage to the circuit.
4. Ensure that the antenna is obstructed during the use of the antenna, without
bending, and as far as possible away from the large metal structural parts, to avoid
communication obstruction due to the above reasons.
5. Do not disassemble or modify it without permission. If you encounter problems
that cannot be solved during installation or use, please contact Huazhiyi or your
agent.
6. Pay attention to keep the proper distance between the electronic devices during
installation to minimize electromagnetic interference between devices.
7. Make sure all connections are securely fastened and all parts are working
properly before use.
8. Please check the surrounding environment before use to ensure that there is no
interference from other 840MHZ-930MHZ equipment, otherwise the radio data
transmission may be seriously affected.
4
9. For better service customers, we have been optimizing the product upgrade. The
matching software and firmware of the product will be updated and updated from
time to time. There may be incompatibility between different firmware versions on
the ground and onboard. So please pay attention to check the software firmware
version when using. Please also pay attention to our website to get the latest
software firmware and technical support.
10. The software, firmware, drivers, port conversion tools, etc. involved in this
manual will be updated from time to time on our website. Please visit our website
to download it yourself or contact customer service.
5
Product Introduction
The D04 is a multi-link signal relay system that can simultaneously transmit up to
two independent S-BUS data and one serial port data. By using D04 signal relay
The remote control signal can be enhanced and transmitted to the air unit together
with the TTL signal.So D04 Multi-link Signal Relay solves the problem of short
transmission distance of the remote controller and datalink. D04 features small size,
good integration and high sensitivity. The ground unit is integrated with wireless
network module (WIFI or BLE can be selected according to requirements), so users
can connect to RB20W ground unit by wireless network or USB data cable.
The wireless network can reach a stable coverage of 30~50M without interference.
D04 signal relay works in 840MHZ~915HZ frequency band and the maximum
communication distance is up to 30KM.
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Packing List
Cahrger×1
USB cable×1
Power cable×1
Parameter setting
For ground unit
For parameter
setting
For air unit
（DC:7.4-12V)
For air unit
Ground Unit ×1
Air Unit x 1
Main Module
Accessories
7
Product instructions
D04 can simultaneously transmit up to two independent S-BUS data and one serial
port data. There are two ways to access the serial port data on the ground. One is
to input directly through the USB data line, and the other is to transmit through the
WIFI or BLE wireless network. When D04 detects the USB data cable insertion, it
uses USB to transmit the serial port data preferentially. When it is detected that the
USB data cable is not inserted, D04 automatically switches to your preset wireless
module (WIFI or BLE) to transmit the serial port data. If your remote control or
receiver does not support S-BUS, you will need to purchase a separate PWM to
S-BUS module.
Ground Unit
1 Power indicator and button PWR
2 4 power indicator 25% ，50%， 75%， 100%
3 Config indicator
2 S-BUS signal input，or config type
4 Charge port
Support only DC 12.6V input
5 Antenna interface
8
SMA
6
SET button
For parameter setting
7
USB port Type-C
For parameter setting or data transmission, not batter charge port
8
Data transmission module signal indicator
Indicator RS1 RS2 RS3 is the signal strength indicator. The number of lights indicates the strength of the
signal quality of the high-frequency data transmission module. It can also be used to indicate the type of
wireless network configuration in the configuration mode.
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wireless network connection status indicator nLink
The indicator light indicates that the wireless network is connected or transmitting data, and the indicator is off
indicating that the wireless network is not connected or is not transmitting data.
10
Working status indicator of wireless network nReady
When the indicator is on, the wireless module is working properly and can connect and transfer data.
Ground unit connection
diagram
9
Radio Power On and Off
1. After pressing the power button PWR, the power indicator lights up and the four
battery indicator lights start to flash simultaneously.
2. During the period when the battery indicator flashes (about 5S), release the
power button and press and hold the power button again. At this time, the four
battery indicators will light up in the way of the water lamp until the buzzer sounds
long. Indicates that the boot action is complete.
3. The shutdown operation is the same as the startup operation. The flow direction
indication is different from the startup only when the button is pressed for a long
time.
10
Status Indicator Instructions
Indicator
status
implication
RS1,RS2,RS3 Configuration
mode
RS1 flash，RS2 和 RS3 go out
current wireless mode is WIFI
RS 1and RS2 flash， RS3 go out
current wireless mode is BLE
RS1,RS2,RS3 status before
turned on
RS1 is on，RS2and RS3 go out
current wireless mode is WIFI
RS 1and RS2 are on， RS3 goes out
current wireless mode is BLE
RS1,RS2,RS3working status
RS1,RS2,RS3 are on
High frequency module signal is strong
RS 1and RS2 is on，RS3 go out
High frequency module signal is general
RS1 is on，RS2and RS3 goes out
High frequency module signal is weak
Config
Always being on
In high frequency module config. mode
Go out
SBUS1 and SBUS2 no signal input
One flash a time
SBUS1 has signal input
Two flashes a time
SBUS2 has signal input
Quich flashing
SBUS1 and SBUS2 has signal input
PWR power indicator
flash
Firmware upgrade status in configuration mode
flash， with short continuous sound of
buzzer
Low voltage alarm
Always being on
Radio is powered on，in normal working status
Go out
Radio is powered off
4 power capacity indicator
25% flash， other 3 go out
LOW BATTERY less than 25%
25% flash，other 3 go out
Power during 25%～50%
25% and 50% is on ，other 2go out
Power during 50%～75%
25%、50% and 75% on，100% goes out
during 75%～100%
25%、50%、75%和 100% all are on
Fully charged 100%
All 4 flash， with short continuous
sound of buzzer
High temperature protection status
Ground Unit Indicator
11
nReady
on
The wireless module works normally and forms
a wireless network
off
The wireless module does not work properly
and does not form a wireless network
nLink
On
Wireless network data transmission is normal
off
Wireless network data transmission is abnormal
4 battery indicator lights from full-on state to full-off. After 5S, the
nReady indicator lights off first and then lights up.
The wireless module restored factory Settings
successfully
Receiver Indicator
indicator
status
implication
L1 灯
off
SBUS1 and SBUS2 no signal transmission
One flash a time
SBUS1 has signal transmission
One flash a time
SBUS2 has signal transmission
Quick flashing
SBUS1 and SBUS2 has signal transmission
L2 灯
Always being on
The receiver is in high frequency configuration
mode with no power output
L1、L2 always being on at the same time
The receiver is in firmware upgrade mode
RXD 灯
flash
Receiver has data reception
TXD 灯
flash
Receiver has data re-transmit
S1、S2、S3all on
Strong signal quality
S1 off，S2 and S3 on
Middle level of signal quality
S1 and S2 off，S3 flashes
weak signal quality
12
Ground Unit and PC Communication
The communication between the ground terminal and the host computer uses the
USB data cable by default. If the USB data cable is not connected, the radio station
will automatically switch to the preset wireless module (WIFI or BLE) to transmit
the serial port data.
Ground terminal USB port
identification
After the radio is turned on, connect the radio and PC with the USB cable. If the
USB to serial port driver has been properly installed, the PC will display a port as
shown. If a yellow exclamation mark is displayed, the driver is not installed
correctly. Please go to our website to download the relevant driver.
13
Wireless network selection and setup
Press and hold the set button during the boot process until the RSSI indicator RS1
flashes or RS1 and RS2 flash simultaneously, indicating that the wireless network
switching and configuration mode is entered. At this time, release the set button to
set the wireless module parameters and switch the wireless network through the
serial port AT command. For the WIFI module and Bluetooth module parameter
settings, please check the WIFI and Bluetooth parameter configuration chapters.
The following describes the switching of the wireless network, the specific method
is as follows:
Short press the PWR button to switch the wireless network. The number of flashing
RS1, RS2, and RS3 indicators indicates the wireless network type. The RS1 flashing
indicates that the current switch is WIFI, and the WIFI parameter can be set through
the USB data cable by using the serial AT command. RS1 and RS2 flash
simultaneously to indicate that the current switch is BLE, and the BLE parameter can
be set through the USB data line using the serial AT command. After the setting is
completed, press the set button to exit the setting.
WIFI Wireless Network Connection
The PC and the radio are not connected by the USB data cable, if the wireless
network selects the WIFI network, the WIFI network can be used for the serial
port link data transmission. The first time connecting to the WIFI network, you
need to connect manually. After selecting the automatic connection, as long
as the PC is within the range of the radio WIFI network, it will automatically
connect and can directly use the WiFi network communication.
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