1. Product Description
The HLK-LD306S is a 24GHz millimeter wave radar module designed for detecting the moving speed of vehicles. It continuously reports speed information via serial ports (RS232/RS485). This module is robust against environmental factors such as temperature, humidity, airflow, dust, noise, and light conditions. Its strong anti-interference capabilities allow it to penetrate non-metallic materials like acrylic, glass, plastic, and thin non-metallic enclosures.
2. Specifications
The following table details the technical specifications of the HLK-LD306S-24G radar module:
| Parameter | Value |
|---|---|
| Model | HLK-LD306S-24G |
| Operating Frequency Band | 24.125GHz |
| Transmit Power | 40dBm |
| Antenna | Horizontal angle 45° / Vertical angle 90° |
| Working Current | 70mA |
| Operating Voltage | DC12V |
| Operating Temperature | -40°C to +80°C |
| Data Interface | RS232/RS485 serial port |
| Data Format | 9600, 8, n, 1 |
| Response Time | ≥60ms |
| Detection Range | 10~250km/h |
| Detection Distance | ≤150m (truck/truck can reach 350m) |
| Detection Accuracy | 1km/h |
| Product Size | 64mm x 65mm |
For a visual representation of the technical parameters, refer to the image below:
3. Setup and Installation
3.1. Appearance and Interface
The HLK-LD306S-24G module features a compact design with clearly marked components on both the antenna and digital sides.
3.2. Wiring and Interface Line Sequence
Connect the module using the following interface line sequence:
| Item | Color | PCBA Silk | Function |
|---|---|---|---|
| 1 | Red | +12V | +12V input |
| 2 | Blue | GND | GND |
| 3 | Green | TX/A | RS232 sent / RS485A+ |
| 4 | Yellow | RX/B | RS232 receive / RS485B- |
3.3. Mechanical Dimensions
The module has an outline dimension of 64mm x 65mm. Refer to the diagram below for detailed mechanical dimensions.
3.4. Installation Guidelines
Proper installation is crucial for optimal performance. Consider the following guidelines:
- Roadside Installation: Install the radar on the roadside at a height of 2 meters. The radar should be positioned vertically to the road surface. The detection range is illustrated in the schematic diagram below.
- Elevated Installation (e.g., Billboard or Overpass): When installing at a height of 6 meters, tilt the radar 3° towards the road surface to optimize detection.
4. Operating Instructions
Observe the following precautions and operating notes for effective use of the module:
- Target Detection: This module is designed to detect only relatively moving targets within its detection area. It will not detect completely stationary objects. The output provides speed information for the nearest or fastest moving target within the detection zone.
- Operating Modes:
- Default Mode: The module defaults to continuous automatic reporting using protocol 7.
- Query Mode: To switch to query mode, set the protocol type to 6 and send the hexadecimal query command:
55 5A 02 D3 84.
- Enclosure Design Considerations: If you are designing a custom enclosure for the module, ensure the following:
- Maintain a minimum distance of 6mm between the radar antenna surface and the inner surface of the housing.
- The housing thickness in front of the antenna should be approximately 2-3mm.
- The material covering the antenna surface must NOT be metal or metal-plated paint. Recommended materials include PC or plastic.
- Metal materials can be used for the back of the antenna housing.
5. Maintenance
The HLK-LD306S-24G radar module is designed for durability and requires minimal maintenance. To ensure longevity and optimal performance:
- Keep the module clean and free from dust and debris.
- Avoid exposing the module to extreme physical shock, vibrations, or excessive moisture.
- Ensure proper ventilation if enclosed, especially in high-temperature environments, to prevent overheating.
6. Troubleshooting
If you encounter issues with your HLK-LD306S-24G module, consider the following troubleshooting steps:
- No Power: Verify that the 12V power supply is correctly connected and providing the specified voltage. Check for loose connections or damaged wires.
- No Data Output:
- Confirm that the serial communication wiring (TX/A, RX/B, GND) is correct as per the wiring diagram (Figure 3.2).
- Ensure your serial port settings (baud rate, data bits, parity, stop bits) match the module's data format (9600, 8, n, 1).
- Verify that there are moving targets within the detection area. The module does not report on stationary objects.
- Inaccurate Speed Readings:
- Check the installation angle and height, especially for elevated installations, to ensure it aligns with the guidelines (Figure 3.4).
- Ensure there are no obstructions or inappropriate enclosure materials (e.g., metal) directly in front of the antenna surface.
- Module Not Responding to Commands: If attempting to use query mode, ensure the correct hexadecimal command (
55 5A 02 D3 84) is sent after setting the protocol type to 6.
If problems persist after following these steps, please contact technical support.
7. User Tips
No specific user tips are available from the provided data at this time.
8. Frequently Asked Questions (FAQ)
No specific FAQ content is available from the provided data at this time.
9. Warranty and Support
For technical support, warranty inquiries, or further assistance with your HLK-LD306S-24G radar module, please contact the manufacturer, Shenzhen Hi-Link Electronic Co., Ltd. Refer to your purchase documentation for specific contact details or visit the official Hi-Link website.