PDDAXLQUE DX-Smart LR02 LoRa Module User Manual

1. Introduction

The DX-Smart LR02 is a low-power LoRa module designed for long-range wireless data transmission. It features an ASR6601 RF chip and supports UART serial communication, enabling transparent data transmission between devices. This module operates within the 433-475MHz frequency range and is ideal for various IoT applications requiring reliable, long-distance communication.

This manual provides detailed instructions for the setup, operation, and maintenance of your DX-Smart LR02 LoRa module.

2. Key Features

• ASR6601 SOC Chip: Integrated for efficient LoRa communication.
• 32-bit ARM STAR Core: Provides robust processing capabilities with a maximum frequency of 48MHz.
• UART Serial Communication: Supports transparent data transmission with configurable baud rates (1200 to 128000).
• Extensive AT Command Set: Allows configuration of module parameters such as mode, frequency, MAC address, bandwidth, spreading factor, and coding rate without complex programming.
• Long Communication Distance: Achieves up to 5km in open-space environments.
• Wide Operating Voltage: 3.3V-5.5V (typical 5V).
• Low Power Consumption: Supports sleep mode for energy efficiency.
• Certifications: CE, FCC, and RoHS compliant for safety and reliability.

3. What's in the Box

The standard package includes:

• 1x DX-Smart LR02 LoRa Module (LR01-A)
• 1x 433MHz Magnetic Base Antenna

Image 1: DX-Smart LR02 LoRa Module with its magnetic base antenna. The module is blue with a metal shield, and the antenna is black with a coiled base and a long whip, connected via a coaxial cable.

4. Setup

4.1 Module Overview and Dimensions

Familiarize yourself with the module's physical characteristics and pinout before integration.

Image 2: Diagram illustrating the key features and dimensions of the LR02-433T22D module. It highlights the ASR6601 SOC chip, ARM STAR core, UART communication, AT commands, frequency support (410-493MHz), high power PA, maximum receiver sensitivity, sleep mode, 5km line-of-sight distance, operating voltage, module size (36x16.5x4mm), and certifications. A side view shows dimensions of 18mm width and 35.6mm length, with pin spacing of 2.54mm.

4.2 Initial Connection

1. Connect Antenna: Securely attach the provided 433MHz magnetic base antenna to the SMA connector on the LR02 module.
2. Power Supply: Connect the module to a stable power supply within the 3.3V-5.5V range. Ensure correct polarity.
3. UART Connection: Connect the module's UART pins (TX, RX, GND) to your microcontroller or PC via a USB-to-UART converter.

5. Operating Modes

The DX-Smart LR02 module supports various working modes for data transmission:

Image 3: Diagram illustrating three working modes: transparent transmission (requires same channel), fixed-point transmission (communicates with specified addresses and channels), and broadcast transmission (communicates with designated channel modules).

5.1 Module and Module Transparent Transmission

In this mode, both the sender and receiver modules must be configured to the same channel to transmit and receive data. Data is transmitted directly without addressing.

5.2 Module and Module Fixed-Point Transmission

This mode allows communication with specific modules by addressing. Data transmission format includes the receiving address, receiving channel, and the data itself (in hexadecimal format).

5.3 Modules and Module Broadcast Transmission

This mode enables communication with multiple designated channel modules simultaneously. The data transmission format includes the receiver channel and the data (in hexadecimal format).

6. AT Command Set

The LR02 module is configured and controlled using AT commands. These commands allow you to set and query various parameters of the module.

Image 4: Table detailing common AT commands for the LR02 module, including AT (Test), +++ (Enter/exit AT command mode), AT+BAUD (Set/query baud rate), AT+MODE (Set/query operating mode), AT+SLEEP (Set/query power consumption mode), AT+CHANNEL (Set/query working channels), AT+MAC (Set/query device address), and AT+POWE (Set/query transmit power). Default values are provided for each.

Common AT Commands:

• AT: Tests the serial port connection. Response: OK.
• +++: Enters or exits AT command mode. Power-up defaults to transmission mode.
• AT+BAUD: Sets or queries the serial port baud rate. Default: 4 (9600).
• AT+MODE: Sets or queries the operating mode. Default: 0 (transparent transmission).
• AT+SLEEP: Sets or queries the power consumption mode. Default: 2 (high time mode).
• AT+CHANNEL: Sets or queries the working channels. Default: 00.
• AT+MAC: Sets or queries the device address. Default: ff ff.
• AT+POWE: Sets or queries the transmit power. Default: 22dB.

For a complete list of AT commands and detailed usage, please refer to the product information packages and technical documentation provided by DX-SMART.

7. Communication Distance

The DX-Smart LR02 LoRa module is capable of long-range communication. Actual measured communication distance in open space can reach up to 5 kilometers.

Image 5: Visual representation of the drone-measured communication distance for the LoRa module. It shows a drone with the module attached, a ground station with another module, and a map indicating a visible distance of up to 5km in an open area.

8. Specifications

Image 6: Table detailing the main parameters of the 433MHz Magnetic Base Antenna, including frequency range, size, gain, VSWR, interface, impedance, efficiency, operating temperature, and storage temperature.

9. Maintenance

To ensure optimal performance and longevity of your DX-Smart LR02 LoRa module:

• Environmental Conditions: Operate the module within the specified temperature and humidity ranges. Avoid extreme conditions.
• Power Supply: Use a stable and clean power supply to prevent damage to the module.
• Antenna Connection: Ensure the antenna is securely connected. A loose connection can degrade performance.
• Physical Handling: Handle the module with care to avoid physical damage to components or pins.
• Cleaning: If necessary, gently clean the module with a dry, soft cloth. Avoid using liquids or harsh chemicals.

10. Troubleshooting

10.1 No Communication via UART

• Check Wiring: Verify that TX, RX, and GND connections are correct between the module and your UART converter/microcontroller.
• Baud Rate: Ensure the baud rate configured in your serial terminal matches the module's baud rate (default 9600).
• Power Supply: Confirm the module is receiving adequate power within the specified voltage range.
• AT Command Mode: Ensure you are in AT command mode (by sending '+++') if attempting to configure the module.

10.2 Poor Communication Range

• Antenna Connection: Check if the antenna is properly connected and not damaged.
• Obstructions: Ensure there are no significant physical obstructions (buildings, dense foliage) between the transmitting and receiving modules. LoRa performance is best in line-of-sight conditions.
• Frequency/Channel Mismatch: Verify that both modules are configured to the same frequency and channel.
• Interference: Check for potential sources of RF interference in the operating environment.

11. Technical Support and Warranty

PDDAXLQUE, as the brand, and DX-SMART, as the manufacturer, provide comprehensive technical support for the LR02 LoRa module. This includes technical documentation, AT command sets, module footprints, reference design schematics, and development/test tools.

If you encounter any problems or require assistance, please contact us through the User Guide → Product Information → Service Support section on the product page or directly via the manufacturer's support channels. We are committed to resolving any issues you may experience.

For detailed product information and additional resources, please refer to the official user guide PDF: DX-Smart LR02 LoRa Module User Guide (PDF).