1. Introduction
The DX-LR03 is a high-performance LoRa module designed for long-range wireless communication. It features an ASR6601 SOC Chip with a PA amplifier, enabling a communication range of up to 10km. The module supports UART serial communication and offers a rich set of AT commands for flexible configuration. It is suitable for various IoT applications requiring reliable, long-distance data transmission.
Key features include:
- ASR6601 SOC Chip + PA amplifier
- Long Range 10km communication
- UART Serial Communication
- Abundant AT commands
- CE, FCC, RoHS Certification
- Wireless & Antenna Mode
2. Setup
2.1 Package Contents
The DX-LR03 Developer Package typically includes the following components:
- 2 x LR03-433T30D (or LR03-900T30D) LoRa serial communication modules
- 2 x USB to TTL Adapter Boards
- 2 x USB cables
- 2 x Rubber rod antennas (e.g., 19cm)
2.2 Module Assembly and Connection
Follow these steps to assemble and connect your LoRa module:
- Attach the rubber rod antenna to the SMA connector on the LoRa module.
- Insert the LoRa module into the PJ15 adapter board, ensuring correct pin alignment. The adapter board provides USB connectivity for easy setup and communication.
- Connect the USB cable to the adapter board and your computer.
2.3 Pin Definitions
The LoRa module features a standard pinout for integration. Refer to the diagram and table below for pin functions:
| Pin Number | Pin Name | Pin Function | Description |
|---|---|---|---|
| 1 | M0 | Reserved | Customisable IO port |
| 2 | M1 | Reserved | Customisable IO port |
| 3 | RXD | Serial Data Input | - |
| 4 | TXD | Serial Data Output | - |
| 5 | AUD | Module RF status indicator pin | Reference Technical Manual |
| 6 | VCC | Power input pin | 5V (typical) |
| 7 | GND | Power Ground | - |
2.4 Adapter Board Wiring
The adapter board facilitates easy connection and power supply. Ensure the module and adapter board are inserted with positive and negative pins correctly aligned.
3. Operating Modes
The DX-LR03 module supports various working modes for flexible communication:
3.1 Transparent Transmission
In this mode, the module transmits data transparently. Both the sender and receiver modules must be configured to the same channel to send and receive data.
3.2 Fixed-Point Transmission
This mode allows communication with modules that have specified addresses and channels. Data transmission format is hexadecimal: receiving address + receiving channel + data.
3.3 Broadcast Transmission
This mode enables communication with designated channel modules. Data transmission format is hexadecimal: receiver channel + data.
3.4 AT Command Set
The module is configured using AT commands. Below is a summary of common AT commands. For a complete list and detailed usage, please consult the product information packages.
| AT command | Command description | Clarification |
|---|---|---|
| AT | Test (Response OK) | For testing the serial port |
| +++ | Enter/exit AT command mode | Power-up defaults to transmission mode |
| AT+BAUD | Set/query baud rate | Default: 4 (9600) |
| AT+MODE | Set/query operating mode | Default: 0 (transparent transmission) |
| AT+SLEEP | Set/query power consumption mode | Default: 2 (high time mode) |
| AT+CHANNEL | Set/query working channels | Default: 00 |
| AT+MAC | Set/query device address | Default: ff ff |
| AT+POWE | Set/query transmit power | Default: 22dB |
| AT+IQ | Setting the Iq signal flip-flop |
Note: For more AT commands, please consult the product information packages.
4. Specifications
The DX-LR03 LoRa module offers robust performance for long-range communication:
| Parameter | Value |
|---|---|
| Chip Model | ASR6601 SOC + PA amplifier |
| Firing Power | 0 ~ +27dBm |
| Communication Interface | LPUART |
| Communication Distance | Visible distance up to 10km in the open |
| Frequency Band | 850-931MHz (Global Compatibility), 430-470MHz (Asia), 850-950MHz (North America) |
| AT Instruction | Simple AT instruction set available, refer to datasheet for details |
| Transmission Method | Transparent transmission, Fixed-point transmission, Broadcast transmission |
| Operating Temperature | -40°C ~ +85°C |
| Operating Voltage | 3.4 ~ 5.5 V (Typical 5V) |
| Modulation Method | Spread Spectrum Modulation |
| Receiver Sensitivity | -138dBm |
| RF Input Impedance | 50Ω |
| Module Size | 43(L)mm x 28(W)mm x 3.2(H)mm |
| Certifications | CE, FCC, RoHS |
4.1 SMA Adapter Cable Specifications
If your package includes an SMA Adapter Cable, here are its main parameters:
| Main parameters | Parameter value |
|---|---|
| Operating frequency | 0-6GHZ |
| Antenna efficiency | 35-80% |
| VSWR | <1.8 |
| Polarization mode | Vertical polarization |
| Antenna interface | SMA external thread internal hole/IPEX generation |
| Impedance | 50Ω |
| Antenna size | 120mm |
| Power capacity | 33dbm |
| Operating temperature | -30°C ~ 70°C |
5. Maintenance
To ensure optimal performance and longevity of your DX-LR03 LoRa module, consider the following maintenance guidelines:
- Environmental Conditions: Operate the module within the specified temperature range of -40°C to +85°C. Avoid exposure to extreme humidity, dust, or corrosive environments.
- Physical Inspection: Periodically check for any visible damage to the module, antenna, or connectors. Ensure all connections are secure.
- Firmware Updates: Keep the module's firmware updated to benefit from performance improvements and bug fixes. Refer to the official documentation for update procedures.
- Power Supply: Use a stable power supply within the recommended voltage range (3.4V to 5.5V). Unstable power can affect module performance and lifespan.
- Antenna Care: Ensure the antenna is properly connected and not bent or damaged, as this can significantly impact communication range and reliability.
6. Troubleshooting
If you encounter issues with your DX-LR03 LoRa module, consider these common troubleshooting steps:
- No Communication:
- Verify power supply voltage and connections.
- Check UART connections (TX/RX) for correct wiring.
- Ensure baud rates are matched between the module and your host device.
- Confirm that both sender and receiver modules are on the same channel and configured for the correct transmission mode (transparent, fixed-point, or broadcast).
- Check the indicator light status: Red light blinking indicates working status. If off, it might be in hibernation mode; if flashing, it's waking up.
- Short Communication Range:
- Ensure antennas are securely attached and undamaged.
- Verify that the antenna type is appropriate for the module's frequency band.
- Check for obstructions between modules (e.g., buildings, dense foliage). LoRa performance is best in open areas.
- Confirm transmit power settings using AT commands.
- AT Command Issues:
- Ensure you are in AT command mode (e.g., by sending '+++').
- Check serial port settings (baud rate, data bits, parity, stop bits).
- Refer to the detailed AT command set documentation for correct syntax.
7. User Tips
Here are some tips to enhance your experience with the DX-LR03 LoRa module:
- Antenna Placement: For optimal range, ensure antennas are placed as high as possible and have a clear line of sight to each other. Avoid placing them near large metal objects.
- Power Consumption: Utilize the module's sleep mode (AT+SLEEP command) for battery-powered applications to conserve energy when not actively transmitting or receiving.
- Frequency Band Selection: Choose the appropriate frequency band (e.g., 868/915MHz for North America, 433/475MHz for Asia) based on your geographical location and local regulations.
- Developer Resources: Make full use of the provided professional technical documentation, including product specifications, module pinouts, module dimensions, and hardware design references, for in-depth understanding and integration.
8. Warranty and Support
DX-SMART is committed to providing reliable products and support. For any technical assistance, documentation, or inquiries, please refer to the following resources:
8.1 Professional Technical Documentation
Comprehensive documentation is available to help you use the module more easily and conveniently. This includes Product Specifications, Module Pinout, Module Dimensions, Package Diagrams, Hardware Design Reference, Serial Test Tools, and the full AT Command Set.
Download addresses for specific module versions:
- DX-LR03-433T22D: https://drive.google.com/drive/folders/1cZuSijREAAGVA6cPdXaEJvyVZtEOh8HW?usp=drive_link
- DX-LR03-900T22D: https://drive.google.com/drive/folders/1YpZ8bZLGsA236oXeHRKrF89-5jHhlSXk?usp=drive_link
8.2 Contact Support
If you are unable to download the materials or require further assistance, please contact our after-sales team:
- Email: Manager@szdx-smart.com
- Website: en.szdx-smart.com
We aim to respond to your questions within 24 hours.
