Fixed RFID Reader Buying Guide: 5 Core Parameters You Must Know

Choose the Right Frequency Band: HF or UHF?

RFID systems generally operate in three frequency bands: Low Frequency (LF), High Frequency (HF), and Ultra High Frequency (UHF). For B2B scenarios like industrial automation, logistics tracking, and warehouse management, most fixed RFID readers use either HF (13.56MHz) or UHF (902–928MHz).

• HF fits short-range, high-interference environments such as production line workstations.
• UHF enables long-range and multi-tag read

Read Range: Define the Required Coverage Based on Your Use Case

Reading distance is one of the most critical RFID reader specs. HF typically reads within 10 cm, while UHF can reach over 10 meters. When buying reader, consider these factors:

• Tag type and performance
• Antenna gain
• Whether the installation environment has metal interference

For projects like warehouse entry/exit control, vehicle ID, and asset tracking, define both the minimum and maximum read range requirements, and choose a reader with adjustable output power.

Output Power: Adjust Power to Control Reading Range

The reader’s output power—usually from 0 to 30 dBm—directly affects both reading distance and energy efficiency. Choose a model that supports power adjustment to handle:

• Restricted reading zones (e.g., anti-cross-read setups)
• Environments needing high penetration (e.g., metal shielding)
• High-speed tag recognition (e.g., conveyor belt logistics sorting)

4. Interface Options: RJ45, RS232, USB, or Relay Output?

Industrial-grade RFID readers should support multiple interfaces for system integration. Common interface types include:

• RJ45 (Ethernet): Ideal for remote deployments and centralized network management
• RS232/RS485: Reliable for industrial serial communication
• USB: Useful for testing and debugging
• Relay Output/IO Interfaces: Enable control of gates or other linked automation equipment

Clarify your system’s integration needs and choose a reader with versatile interface options.

5. Operating Modes: Active, Triggered, or Custom Logic

A fixed RFID reader’s operating mode determines how it controls the scanning process. Common modes include:

• Continuous Active Mode: Constant scanning; ideal for logistics sorting
• Sensor-Triggered Mode (IO Mode): Uses IR or loop sensors to initiate reading
• Command-Controlled Mode: Host device sends instructions to start reading
• Edge Logic Processing: Advanced models support whitelist filters, local caching, and data filtering

Choose reader that supports multiple operating modes and remote configuration for greater flexibility in future expansions.

Conclusion

When purchasing fixed RFID reader, evaluate it across five key areas: frequency compatibility, read range, power control, interface type, and operating mode. Industrial-grade models that support multi-protocols, multiple interfaces, remote configuration, and adjustable power offer the best flexibility for complex deployment needs.

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