1. Introduction
The DX-LR03 is a high-performance LoRa wireless module designed for long-range communication applications. Featuring an ASR6601 SOC Chip with a PA Amplifier, it offers reliable data transmission up to 10km in open environments. This module supports UART serial communication with a rich set of AT commands, making it suitable for various IoT projects including smart city and agriculture solutions. This manual provides detailed instructions for setting up, operating, and maintaining your DX-LR03 module.
2. Key Features
- Chipset: ASR6601 SOC Chip + PA Amplifier
- Long Range: Up to 10km communication distance
- Processor: 32-bit ARM STAR Core, Maximum Frequency 48MHz
- Communication: UART Serial Communication with abundant AT commands
- Frequency Support: 433~475MHz (Global Compatibility)
- Output Power: High power PA, +27dBm
- Receiver Sensitivity: Maximum -142dBm
- Power Modes: Supports sleep mode and Wake on Air mode
- Operating Voltage: 4V-5.5V (typical: 5V)
- Module Size: 43(L)mm x 28(W)mm x 3.2(H)mm
- Certifications: CE, FCC, ROHS certified
3. Package Contents
The LR02-433T30D Developer Package typically includes:
- LR03-433T30D Module (x2)
- USB to TTL Adapter Board (x2)
- USB Cable (x2)
- Rubber Rod Antenna (x2)
Note: The LR03-433T30D has the same functions as LR03-900T30D, differing primarily in frequency band.
4. Setup Guide
4.1. Module Dimensions
The module measures 43mm (Length) x 28mm (Width) x 3.2mm (Height). The distance between two rows of pins is 2.54mm.
4.2. Pin Definitions
| 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 | AUX | Module RF status indicator pin | Reference Technical Manual |
| 6 | VCC | Power input pin | 5V (typical) |
| 7 | GND | Power Ground | - |
4.3. Antenna Connection
Connect the provided rubber rod antenna to the SMA connector on the LoRa module. Ensure a secure connection for optimal performance.
4.4. Adapter Board Wiring
To interface the LoRa module with a computer or microcontroller, use the PJ15 adapter board. The adapter board provides USB connectivity and breaks out essential pins. Ensure the module is inserted with positive and negative pins correctly aligned.
- PJ15 Adapter Board Pinout:
- 3V3/GND
- 5V/5V
- CNC/NC
- RX/RX
- TX/TX
Indicator Status:
- Working status: Red light blinking
- Hibernation mode: Light off when hibernating
- Wake up mode: Red light flashing when waking up
5. Operating Modes
The DX-LR03 module supports several working modes for flexible communication:
- Module and module transparent transmission: This mode requires the same channel for both the sender and receiver to send data. Data is transmitted directly without addressing.
- Module and module fixed-point transmission: Communicate with modules using specified addresses and channels. The data transmission format is hexadecimal:
receiving address + receiving channel + data. - Modules and module broadcast transmission: Communicate with designated channel modules. The data transmission format is hexadecimal:
receiver channel + data.
6. AT Command Set
The module uses AT commands for configuration and control. Below are some common AT commands:
| 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 |
For more detailed AT commands and their usage, please consult the full product information packages available for download.
7. Specifications
7.1. LoRa Module Parameters
| Parameter | Details |
|---|---|
| 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 (for LR03-900T30D) / 433-475MHz (for LR03-433T30D) |
| 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 | LR03-A: 4V ~ 5.5V (Typical 5V) |
| Modulation Method | Spread Spectrum Modulation |
| RF Input Impedance | 50Ω |
7.2. Glue Stick Antenna Parameters
| Main parameters | Parameter value |
|---|---|
| Antenna efficiency | 35-80% |
| Frequency | LR03 Module: 410~493MHz |
| Gain | 3dBi |
| Polarization | Vertical polarization |
| VSWR | <1.8 |
| Antenna size | 50mm |
| Impedance | 50Ω |
| Antenna interface | SMA inner screw inner needle |
| Operating temperature | -30°c ~ 70°c |
8. Application Scenarios
The DX-LR03 LoRa Wireless Module is versatile and can be integrated into various applications, including:
- Smart Home: For long-range control and monitoring of home devices.
- Smart Farm: Ideal for agricultural monitoring, such as soil moisture, temperature, and irrigation control over large areas.
- Industrial Manufacturing: For remote data acquisition and control in industrial automation and monitoring systems.
9. Troubleshooting
- No communication: Check power supply, ensure correct wiring of RX/TX pins, verify baud rate settings using AT commands, and confirm modules are on the same channel.
- Short communication range: Ensure antennas are securely connected and positioned optimally. Verify transmit power settings using AT commands. Ensure there are no major obstructions in the line of sight.
- Module not responding to AT commands: Ensure you are in AT command mode (enter '+++'). Check serial port connection and baud rate.
10. User Tips
- Always ensure proper antenna connection before powering on the module to prevent damage.
- When testing communication range, perform tests in an open area with minimal interference for best results.
- Refer to the detailed technical documentation for advanced AT command configurations and specific application examples.
11. Certifications
The DX-LR03 LoRa Wireless Module complies with global certification standards, including CE, FCC, and RoHS, ensuring product quality and safety.
12. Technical Documentation and Support
Professional technical documentation is available to help you use the module more easily and conveniently. This includes:
- Product Specification
- Module Pinout
- Module Dimensions
- Package Diagram
- Hardware Design Reference
- Serial Test Tools
- AT Command Set
- Dedicated Aftermarket information
Download Address for DX-LR03-433T30D: https://drive.google.com/drive/folders/1cZuSijREAAGVA6cPdXaEJvyVZtEOh8HW?usp=drive_link
Download Address for DX-LR03-900T30D: https://drive.google.com/drive/folders/1YpZ8bZLGsA236oXeHRKrF89-5jHhlSXk?usp=drive_link
If you are unable to download or require further assistance, please contact our after-sales team at: Manager@szdx-smart.com. We aim to respond to your questions within 24 hours.
