Video doorbell TA2021

Ship or pick up from our office.

RFID Tag Access Control

1. RFID Tag/Credential: Each authorized individual or item is assigned an RFID tag. This tag contains a microchip that stores a unique identification code and an antenna.
2. RFID Reader: A reader (also called an interrogator) is installed at the access point (e.g., a door, gate, or turnstile). The reader emits radio waves.
3. Communication: When an RFID tag comes within range of the reader's radio waves, the tag's antenna captures energy from the reader's signal (for passive tags) or uses its own power source (for active tags) to activate its microchip. The tag then transmits its unique data back to the reader.
4. Data Processing: The reader decodes the information from the tag and sends it to a central access control software or system.
5. Authentication and Decision: The software compares the tag's unique ID with a database of authorized users and their assigned permissions. If the ID is valid and the user has permission to access that specific area at that time, the system sends a signal to unlock the door, open the gate, or grant access. If not, access is denied.
6. Logging: The system typically logs every access attempt (both granted and denied), providing an audit trail for security monitoring and compliance.

• RFID Tag Access Controls/Credentials: These are the physical devices carried by users. They come in various forms, such as:
  • Cards: Similar to credit cards, commonly used for employee badges or hotel key cards.
  • Key Fobs: Small, convenient devices attached to keychains.
  • Wristbands: Often used in recreational facilities or for events.
  • Stickers/Labels: Can be affixed to items or vehicles.
  • Mobile Credentials: Increasingly, smartphones can act as RFID tags through NFC (Near Field Communication), a subset of HF RFID.
• RFID Readers: Devices that emit radio waves to energize and read data from RFID tags. They can be fixed (at entry points) or mobile (handheld scanners).
• Antennas: Integral to the reader (or external), they transmit and receive radio signals to and from the tags. The antenna design influences the read range and reliability.
• Access Control Software/Management System: The "brain" of the system. This software manages user databases, assigns access permissions, logs events, and allows administrators to configure and monitor the system remotely.
• Access Control Panel/Controller: Hardware that connects the readers to the central software, processing data and controlling the locking mechanisms.

• Passive RFID Tags:
  • Do not have an internal power source.
  • They draw power from the radio waves emitted by the reader to operate.
  • Are generally smaller, less expensive, and require no maintenance.
  • Have a shorter read range (a few centimeters to a few feet).
  • Most commonly used in access control for cards and key fobs.
• Active RFID Tags:
  • Have their own internal power source (battery).
  • Can transmit data over longer distances (up to several hundred meters) and at regular intervals.
  • Are larger and more expensive.
  • Often used for long-range applications like vehicle tracking or asset management.
• Semi-Passive RFID Tags (Battery-Assisted Passive - BAP):
  • Contain a battery to power the microchip, but still rely on the reader's signal to initiate communication.
  • Offer better read range and performance than passive tags, without continuously transmitting like active tags.

• Low Frequency (LF) RFID (125-134 kHz):
  • Short read range (1-10 cm).
  • Less susceptible to interference from metal and water.
  • Common in traditional access control systems.
• High Frequency (HF) RFID (13.56 MHz):
  • Moderate read range (10 cm-1 meter).
  • Widely used for access control, ticketing, and Near Field Communication (NFC) applications (like smartphone taps).
• Ultra-High Frequency (UHF) RFID (300 MHz-3 GHz, often 860-960 MHz for RAIN RFID):
  • Long read range (up to 12 meters).
  • More susceptible to interference from liquids and metals.
  • Used in applications requiring longer read distances, such as vehicle access control or large-scale inventory tracking.