1. Introduction and Overview
The Fonkan FM-704 is a high-performance UHF RFID reader module designed for various applications including access control, smart parking, warehouse management, and more. This module supports reading, writing, locking, and killing RFID tags, operating in auto, command, or trigger modes. It features a TTL interface and is compatible with multiple platforms, offering flexibility for integration into different systems.
Figure 1: Fonkan FM-704 UHF RFID Module with highlighted features.
Key features include:
- Read, Write, Lock, and Kill tag capabilities.
- Multiple work modes: Auto, Trigger, Command.
- Compatible with various platforms (e.g., STM/SCM, Android, PC, Raspberry Pi, Arduino).
- TTL interface for easy connectivity.
- Fast reading speed: more than 50 times/second.
- Adjustable RF power from -2 to 27 dBm.
- Compact size for industrial applications.
2. Setup Instructions
This section guides you through the initial setup of your FM-704 UHF RFID reader module.
2.1 Component Identification
Figure 2: Front view of the FM-704 module, indicating SMA Female connectors for antennas and the TTL interface.
Figure 3: Back view of the FM-704 module.
2.2 Pin Definitions
The TTL interface uses a 5-pin connector. Refer to the table below for pin assignments:
Figure 4: PIN Definition table for the TTL interface.
| PIN | Definition | Explanation |
|---|---|---|
| 1 | GND | Ground |
| 2 | EN | Enable power (>1.5V High(active), Low(Power down)) |
| 3 | RX | TTL Level (3.3V), input |
| 4 | TX | TTL Level (3.3V), output |
| 5 | VCC | DC 3V-5V |
2.3 Connecting the Module
The FM-704 module supports up to four antennas via SMA female connectors. It can be connected to a host system using a TTL to USB cable or an RS232 converter.
- Connect Antennas: Attach up to four UHF antennas to the SMA female connectors (ANT1-ANT4) on the module. Ensure connections are secure. The type and size of the antenna will affect the reading distance.
- Connect to Host: Connect the TTL interface of the module to your host system (e.g., PC, Raspberry Pi, Arduino) using an appropriate converter (e.g., TTL to USB cable, RS232 converter).
Video 1: Demonstration of connecting the FM-704 module to a TTL to USB cable and multiple antennas.
Figure 5: Example setup with the FM-704 module connected to an antenna and a USB-TTL converter.
Figure 6: The FM-704 module connected to both RS232 and USB converters, demonstrating connectivity options.
3. Operating Instructions
The FM-704 module offers flexible operation modes and tag interaction capabilities.
3.1 Work Modes
The module supports three primary work modes:
- Auto Mode: The module continuously reads tags without explicit commands.
- Command Mode: The module performs operations only when specific commands are sent from the host system.
- Trigger Mode: Operations are initiated by an external trigger signal.
3.2 Tag Operations
The FM-704 module can perform the following operations on UHF RFID tags:
- Read Tag: Retrieve data stored on the tag. Supports single and multi-tag reading.
- Write Tag: Store new data onto the tag.
- Lock Tag: Permanently or temporarily lock specific memory banks of the tag to prevent further writing.
- Kill Tag: Permanently disable the tag, rendering it unreadable and unusable.
Figure 7: Overview of tag reading capabilities.
Figure 8: Multifunctionality of the FM-704 module.
3.3 Software Development Kit (SDK)
A comprehensive SDK is available to facilitate integration and development for various platforms, including Android, Java, and C#.
Figure 9: Available SDKs for development.
4. Maintenance
To ensure the longevity and optimal performance of your FM-704 module, follow these maintenance guidelines:
- Keep Clean: Regularly clean the module and connectors with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Environmental Conditions: Operate and store the module within the specified temperature and humidity ranges. Avoid exposure to extreme temperatures, moisture, or direct sunlight.
- Secure Connections: Periodically check all cable and antenna connections to ensure they are secure and free from damage.
- Firmware Updates: Check the manufacturer's website for any available firmware updates to improve performance or add new features.
5. Troubleshooting
If you encounter issues with your FM-704 module, consider the following troubleshooting steps:
- No Power: Ensure the VCC and GND connections are correct and providing the specified DC 3V-5V power. Check the EN pin for proper activation (High >1.5V).
- No Tag Reading:
- Verify antenna connections are secure and the correct type of antenna is used.
- Check the RF power settings; adjust if necessary.
- Ensure tags are within the reading range and orientation.
- Confirm the module is in the correct work mode (Auto, Command, or Trigger) for your application.
- Communication Issues:
- Verify RX/TX connections and ensure TTL levels are 3.3V.
- Check baud rate and other serial communication parameters in your host system.
- Ensure the correct drivers are installed for any USB or RS232 converters.
- Buzzer Not Functioning: Check module settings related to buzzer activation.
If problems persist, refer to the detailed SDK documentation or contact technical support.
6. Specifications
Detailed technical specifications for the Fonkan FM-704 UHF RFID Reader Module:
Figure 10: Product specifications table.
| Attribute | Value |
|---|---|
| Model | FM-704 |
| Brand | Fonkan |
| Size | 88.4mm * 60.4mm / 51.0mm * 60.4mm |
| Frequency | 860-960MHz |
| Protocol | ISO18000-6C |
| Work Mode | Auto, Command, Trigger |
| Frequency Hopping | FHSS or Fixed frequency (set by demo) |
| RF Power | -2 ~ 27 dBm (Adjustable) |
| Reading Distance | Dependent on antenna and tag |
| Tips | Buzzer |
| Power Input | DC 3V-5V |
| TTL Level | 3.3V |
| Max Power Consumption | 1W |
7. User Tips
- Antenna Selection: The reading distance is directly influenced by the antenna. Generally, a larger antenna will provide a longer reading distance. Consider your application's range requirements when selecting antennas.
- SDK Utilization: Make full use of the provided SDK and demo software for quick and efficient integration into your projects. This includes examples for Android, Java, and C# development.
- Multi-Antenna Setup: The 4-port design allows for comprehensive coverage. Experiment with antenna placement to optimize read zones for your specific environment.
8. Warranty and Support
Fonkan Technology Co., Ltd. is committed to providing high-quality products and support. For technical assistance, documentation, or any inquiries regarding your FM-704 module, please use the contact information below.
Figure 11: Fonkan customer support contact details.
Contact Information:
- Email/Skype: joerica@fonkan.com
- WhatsApp: +86 198 7476 8776
Free SDK and demo software are available to assist with your development needs.
