1. Introduction
The Quectel EC25-AF is a series of LTE Cat 4 modules optimized specially for M2M and IoT applications. Adopting the 3GPP Rel. 11 LTE technology, it delivers maximum data rates of 150 Mbps downlink and 50 Mbps uplink. Designed in the Mini PCIe form factor, it is compatible with existing Mini PCIe slots, making it easy to integrate into various devices. This manual provides essential information for the proper installation, operation, and maintenance of your EC25-AF module.
This image displays the Quectel EC25-AF 4G LTE module in a Mini PCIe form factor. Key features visible include the Quectel branding, model number EC25-XX (representing EC25-AF), and three antenna connectors labeled MAIN, GNSS, and DIV. Serial number (SN) and IMEI placeholders are also shown.
2. Setup and Installation
Follow these steps to properly install your EC25-AF module:
- Prepare the Host Device: Ensure your host device (e.g., industrial PC, router, development board) has a compatible Mini PCIe slot available and is powered off.
- Insert SIM Card: Locate the SIM card slot on the EC25-AF module (if present, typically on the underside or side). Carefully insert a standard 2FF/3FF/4FF SIM card into the slot until it clicks into place. Ensure the SIM card is correctly oriented as indicated by the module's markings.
- Install the Module: Gently slide the EC25-AF module into the Mini PCIe slot on your host device. Ensure it is fully seated. Secure the module with screws if your host device provides mounting points.
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Connect Antennas: Connect the appropriate antennas to the module's U.FL connectors. Refer to the labels on the module:
- MAIN: Connect your primary LTE antenna here.
- DIV: Connect your diversity/auxiliary LTE antenna here for improved signal reception.
- GNSS: Connect a GNSS (GPS/GLONASS/BeiDou/Galileo) antenna here if you require positioning services.
- Power On and Driver Installation: Power on your host device. The operating system may automatically detect the module and install generic drivers. For optimal performance, it is recommended to download and install the latest drivers and utilities from the official Quectel website or your device manufacturer's support page.
3. Operating Instructions
Once installed and drivers are in place, the EC25-AF module can be operated via AT commands or through specific software interfaces provided by your host system.
3.1. Establishing a Data Connection
- Verify Module Detection: Check your operating system's device manager or network settings to confirm the EC25-AF module is recognized.
- Network Configuration: Configure your network settings to use the EC25-AF module for internet access. This typically involves setting up an Access Point Name (APN) provided by your mobile network operator.
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AT Commands (Advanced Users): For direct control and advanced configurations, you can communicate with the module using AT commands via a serial terminal. Common commands include:
AT+CPIN?: Check SIM card status.AT+CSQ: Check signal quality.AT+QCFG="band": Query/set frequency bands.AT+QICSGP=1,1,"APN_NAME": Set APN.AT+QIACT=1: Activate PDP context (establish connection).
3.2. GNSS Functionality (if applicable)
If a GNSS antenna is connected, the module can provide location data. This functionality is typically accessed via specific AT commands or through a dedicated GNSS software interface on your host device.
4. Maintenance
- Environmental Conditions: Operate the module within its specified temperature and humidity ranges. Avoid exposure to extreme temperatures, direct sunlight, dust, and moisture.
- Cleaning: Keep the module and its connectors clean. Use a soft, dry, anti-static cloth to gently wipe the module. Do not use liquid cleaners or solvents.
- Firmware Updates: Periodically check the Quectel website for firmware updates. Firmware updates can improve performance, add new features, or fix bugs. Follow the provided instructions carefully when performing a firmware update to avoid damaging the module.
- Antenna Integrity: Ensure antennas are securely connected and undamaged. Damaged antennas can significantly degrade signal quality and connection stability.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Module not detected by OS | Incorrect installation, missing drivers, faulty Mini PCIe slot. | Ensure module is fully seated. Install correct drivers. Test in another Mini PCIe slot if available. |
| Cannot establish 4G LTE connection | No SIM card, invalid SIM, incorrect APN, poor signal, network issues. | Check SIM card insertion and validity. Verify APN settings. Check antenna connections. Move to an area with better signal. Contact your network provider. |
| Slow data speeds | Poor signal quality, network congestion, incorrect band selection. | Check signal strength (e.g., via AT+CSQ). Ensure both MAIN and DIV antennas are connected. Try different frequency bands if supported and configured. |
| GNSS not working | No GNSS antenna, faulty antenna, no clear sky view. | Ensure GNSS antenna is connected and functional. Place the antenna with a clear view of the sky. |
6. Specifications
- Model Number: EC25AFFD-MINIPCIE
- Brand: Quectel
- Form Factor: Mini PCIe
- Connectivity: 4G LTE Cat 4
- Max Data Rates: 150 Mbps (DL), 50 Mbps (UL)
- Antenna Connectors: MAIN, DIV, GNSS (U.FL type)
- Typical Application Fields: Education and Learning, M2M, IoT
- Battery Included: No
- Origin: Mainland China
7. User Tips
This section would typically contain practical advice and common solutions derived from user experiences and frequently asked questions. As no specific user feedback was provided, here are some general tips:
- Antenna Placement: For optimal performance, especially with GNSS, ensure antennas are placed in an open area, away from metallic obstructions and other electronic interference.
- Power Management: If integrating into a low-power device, ensure the host system provides sufficient power to the Mini PCIe slot, especially during peak data transmission.
- Software Compatibility: Always verify compatibility with your operating system and application software. Some systems may require specific drivers or configurations.
8. Warranty and Support
For warranty information, technical support, and detailed documentation (such as AT command manuals or hardware design guides), please refer to the official Quectel website or contact your product vendor. Keep your purchase records for warranty claims.