1. Introduction
The PDDAXLQUE DX-Smart LR02 is a low-power LoRa module designed for wireless data transmission. It features the ASR6601 RF chip and operates within the 850-930MHz frequency band. This module facilitates transparent data transmission between devices via serial communication, making it suitable for various IoT applications requiring long-range, low-power connectivity.
2. Product Overview
The LR02 module is built around the ASR6601 chip, offering high power efficiency and extended transmission range. It supports Sub-1GHz band operation, enabling quick integration with gateways for LoRa/LoRaWAN networks.
2.1 Key Features
- Frequency Range: 850~930MHz, suitable for Sub-1GHz applications.
- Serial Communication: Supports transparent data transmission with baud rates from 1200 to 128000.
- AT Command Control: Configurable via AT commands for parameters such as Mode, Frequency, MAC, Bandwidth, Spreading Factor, and Coding Rate.
- Long Communication Distance: Achieves up to 5km in open-space drone tests.
- Certifications: CE, FCC, ROSH compliant for safety and reliability.
2.2 Module Components
The DX-Smart LR02 module typically includes the main LoRa module and an antenna. The module itself is compact, designed for integration into various systems.
Image 1: The DX-Smart LR02 LoRa Module shown with its accompanying antenna. The module is a compact blue PCB with a metal shield, featuring a gold-colored SMA connector for the antenna. The antenna is a black, right-angle rubber rod type.
Image 2: A table detailing the main parameters of the LR02 868/915MHz+ module. Key specifications include ASR6601 SOC chip, LPUART hardware interface, 850-931MHz operating frequency, 0~+22dBm firing power, reference distance up to 8km (open) / 3.8km (urban), -138dBm receiver sensitivity, 3V-5.5V operating voltage, 36mm x 16.5mm module size, and external antenna interface.
3. Setup
This section outlines the basic steps for setting up your DX-Smart LR02 LoRa module, including connecting the antenna and interfacing with an adapter board for serial communication.
3.1 Component Identification and Connection
The LR02 module can be connected to a PJ15 adapter board for easy interfacing. Ensure correct pin alignment to prevent damage.
Video 1: This video demonstrates the unboxing and assembly of the LR02 module. It shows the various components, including the LR01 and LR02 modules, USB cables, rubber rod antennas, and USB to TTL adapter boards. The video highlights the physical characteristics of the LR01 and LR02 modules, their pinouts, and the correct method for connecting the module to an adapter board and antenna. It also illustrates the pin definitions for the adapter plate and emphasizes the importance of correct wiring to avoid damage.
3.2 Wiring Diagram and Pinout
When connecting the LR02 module to an adapter plate, follow the wiring diagram carefully. Incorrect wiring can lead to module damage.
- M0, M1: Reserved, customizable IO ports.
- UART_RX, UART_TX: For serial data reception and transmission.
- AUX: Auxiliary pin (refer to detailed documentation for specific functions).
- VCC: Power supply input (3.3V-5.5V, typical 5V).
- GND: Ground connection.
It is recommended to use either 3.3V or 5V for the VCC power supply.
4. Operating Instructions
The DX-Smart LR02 module operates primarily through serial communication and AT commands for configuration and data transmission.
4.1 Serial Communication
The module supports transparent data transmission. Connect the UART_RX and UART_TX pins to your host device's serial interface. Ensure the baud rate is correctly configured on both ends. Supported baud rates include 1200, 2400, 9600, 19200, 38400, 57600, 115200, and 128000.
4.2 AT Command Configuration
The module can be configured using a set of AT commands. These commands allow you to set various operational parameters without needing to write complex LoRa programming. Examples of configurable parameters include:
- Operating Mode
- Frequency
- MAC Address
- Bandwidth
- Spreading Factor
- Coding Rate
Refer to the comprehensive AT command set provided in the technical documentation for a complete list and usage details.
4.3 Indicator Status
- Working Status: Red light blinking.
- Hibernation Mode: Light off.
- Waking Up from Hibernation: Red light flashing.
5. Specifications
| Parameter | Value |
|---|---|
| Brand | PDDAXLQUE |
| Item Model Number | LR02 Antenna-915Mhz |
| Manufacturer | DX-SMART |
| Chip Type | ASR6601 SOC chip |
| Hardware Interface | LPUART |
| Operating Frequency | 850-931MHz |
| Firing Power | 0~+22dBm |
| Reference Distance (Open Visibility) | Up to 8km |
| Reference Distance (Urban Range) | Up to 3.8km |
| Receiver Sensitivity | -138dBm |
| Operating Voltage | 3V-5.5V (Typical: 5V) |
| Module Size | 36mm x 16.5mm x 4mm (L x W x H) |
| Antenna Interface | External Antenna |
6. Troubleshooting
If you encounter issues with your DX-Smart LR02 LoRa module, consider the following common troubleshooting steps:
- No Communication: Verify all wiring connections, especially UART_RX/TX, VCC, and GND. Ensure the power supply voltage is within the 3.3V-5.5V range. Check that the baud rate settings on your host device match the module's configuration.
- Module Not Responding to AT Commands: Confirm the module is powered on (red light blinking). Ensure the serial port is correctly configured and not in use by another application. Check for correct AT command syntax.
- Poor Communication Range: Ensure the antenna is securely connected and is the correct frequency for your module (e.g., 915MHz for LR02-915Mhz). Obstructions and interference can significantly reduce range. Test in an open environment if possible.
- Module Damage: Incorrect wiring, especially reversed power polarity or excessive voltage, can damage the module. Always double-check connections before applying power.
For further assistance, refer to the detailed technical documentation or contact support as described in the next section.
7. Warranty and Support
PDDAXLQUE, as the manufacturer, provides comprehensive technical support for the DX-Smart LR02 LoRa module. We also offer OEM and ODM services.
7.1 Technical Support
For any technical issues or questions, please utilize the following support channels:
- User Guide: Access detailed user guides and product tutorials.
- Product Information: Find complete product specifications and documentation.
- Service Support: Contact our support team directly through the provided service support channels.
We strongly recommend purchasing a development kit with your initial order to facilitate quick verification of module functionality and accelerate product development.