Table of Contents
3. Product Introduction
D03 dual-link radio can simultaneously transmit remote control signals and data transmission signals. It is primarily used to address issues of short transmission distances and poor quality in remote control and data transmission signals. The D03 operates in the 900 MHz frequency band, with a maximum communication distance of up to 30 kilometers.
4. Item List
Main Modules
Accessories
5. Product Operation Instruction
The D03 has two signal outputs: one is the S-BUS signal, and the other is a serial signal. If your remote controller or receiver does not support S-BUS, you will need to purchase a PWM-to-S-BUS module. Please connect the modules according to the connection diagram shown below.
5.1. Connection Diagram of Ground End
5.2. Connection Diagram of Airborne End
After successful connection, pls refer to the below steps to check the connection status.
(Different flight controller, this procedure differs a little.)
1. Open the Device Manager of the PC, you can see that the ground end is correctly recognized, the driver is correctly installed, no yellow exclamation mark.
2. Open the ground station software, select the corresponding COM port and connect to the flight control. The normal connection of the flight control means that the D03 module’s data transmission link has been connected. If the connection fails, please check the following points.
1) Whether the baud rate of the flight control and the D03 are the same.
2) Make sure the ground unit driver of D03 is installed successfully.
3) Use the parameters setting software of D03 to ensure that all the parameters of the airborne unit and the ground unit are consistent.
4) Make sure that the RX of the flight control corresponds to the TX of D03 and the TX of the flight control corresponds to the RX of D03.
3. Open the RC setting interface in GCS software and check if the data of the remote control is normal. If the data of the remote control changes normally with the joystick, the remote control link is connected. If the remote control connection fails, please check if the “-, +, signal” of S-BUS is reversed.
5.3. D03 Indicators Instruction
① S-BUS data indicator L1
Flashing means there is data transmission of RC link, no flashing means no data transmission of RC link.
②Configuration indicator L2
Always ON means in the configuration mode
③SET button
Used to enter radio configuration mode or set Fail-Safe protection output values or upgrade firmware
④Data transmission indicator
When the RXD light is on, the receiver is receiving data, and when the TXD light is on, the receiver is sending data.
⑤Signal Strength Indicator
Indicator S1 S2 S3 is signal strength indicator. S1&S2&S3 ON, it means strong singal; S2&S3 ON, it means moderate signal; S3 ON, it means weak signal.
5.4. Diagram of Module Normal Connection
After power-on the airborne end and ground terminal, the indicator status is like the below, it means 2 modules have connected normally.
5.5. Read and Modify the Parameters Setting of Radio Link
The D03 parameters have been set at the factory. You should be able to use it directly. In the following cases, you may need to modify the radio parameters.
1. The baud rate of flight control is not the same as the preset baud rate.
2. Communication blocked due to multiple D03 radios occupying the same communication channel.
3. There is special requirements for communication bandwidth and communication power.
To modify the parameters, pls refer to the below steps.
The way to modify the parameters of the airborne end and ground end is basically the same, only the connection cable to the computer is different.
1) Hold down the SET key and power on until the L2 light comes ON, then release the key
2) Follow the connection methods in Figure 1 and 2, connect the ground terminal and computer or the airborne terminal and computer respectively. Note that the white line of the on-board parameter configuration wire corresponds to the on-board TX, the black line corresponds to GND, and the green line corresponds to RX.
Fig 1 Airborne end connection
Fig 2 Ground terminal connection
2. Please confirm whether your data link is H840 or P900, and then select the corresponding parameters setting software.
1) If you are using Version H840, use the corresponding parameters setting software, select the corresponding port and click the connection to read the data link parameters, as shown in the figure below(Note: H840 is currently, no production)
If you want to change the data link parameters, just change the corresponding values in the software, click on Write, and then OK, as shown below
2) If you are using P900 module, pls open the corresponding parameters setting software HZYD03P
To modify the baud rate of the serial port, select the corresponding port, then click Connect, select the corresponding baud rate, and finally click Disconnect.
If you want to modify the data link ID (address) and output power.
①Open the parameters setting software, Click Settings
②After filling out the address and output power, Click Settings first, and then click disconnect. Do not change any other values during this process, or D03 may not be able to communicate).
3. After the modification, press the set key again or power on again to exit the configuration mode.
5.6. Note
- When modifying the parameters, please make sure that the parameters of the ground unit and the airborne unit are same, otherwise the two modules cannot communicate.
- Communication bandwidth and communication power directly affect communication quality and distance. Do not modify the values of these two parameters if you do not understand their specific meanings.
- After entering configuration mode and completing the parameter configuration, be sure to exit configuration mode.
- When you configure P900 version data link system, please strictly follow the picture to configure the contents, do not modify other values, otherwise the radio may not communicate normally.
6. The RC Fail-Safe Setting
If the user needs to set the use protection for the remote control, do the following
1)Write Fail-Safe Protection Data
When the airborne unit and ground unit are connected normally, and there is remote control data transmission, short press the set button on the airborne unit (about 0.5S, the L1 and L2 indicators will light up at the same time for about 1S after releasing), then the current remote control value can be stored in the airborne unit as fail-safe value, and will not be lost after power failure. Please check whether the fail-safe data is written successfully by testing the flight control, ground station or servo.
2)Trigger Fail-Safe Protection Value
When the airborne unit does not receive S-BUS data from the ground unit for consecutive 3S, the airborne unit will keep outputting the previously written fail-safe protection value until it receives S-BUS data from the ground unit.
3)Close Fail-Safe Protection Data
When the airborne unit and ground unit are connected normally, and there is data transmission from the remote control, press and hold the set key (≥5S) on the airborne unit until the L1 and L2 indicators are on at the same time (about 1S), turn off the fail-safe data, and the fail-safe data will not be lost after power failure. Please test if the fail-safe data is off by the flight control, ground station or servo.
Note:
By default, there is no fail-safe protection value output from the data link system.
7. Firmware Upgrade
1)Open Bootloader Upgrading Software
2)Connect a USB cable or configuration cable to the USB port or TTL port, press and hold the set key to power on, the L2 lamp is always on, and then press and hold the set key again until L1, L2 is always on at the same time, and the upgrade software shows the port number, it means in the upgrade mode.
3)Open the correct firmware you have downloaded. If correct, it will show that the firmware file recognition is completed.
4)Click on the Start button, until indicating that the download is completed, it means the upgrade is successful.
8. Common Questions
1)Receiver S-BUS port has signal output, but the serial port is not connected, or the transmitted signal is garbled.
Please check if the baud rate of the serial port of the airborne unit and the ground unit are the same; and set the baud rate to the corresponding baud rate of the ground station software.
2)There is interference when two or more devices are turned on at the same time.
Please check that the ID of each set must be different, and the channels must be set to different values to avoid co-frequency interference.
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