<h1>RFID 125kHz Reader: The Foundation of Access Control and Identification</h1> <p>An <strong>RFID 125kHz reader</strong> is a fundamental device in the world of radio-frequency identification, operating on the low-frequency (LF) band. I've personally worked with these systems for years, starting with a simple DIY project to automate my home workshop's tool log. My knack for understanding electronic protocols quickly helped me integrate various readers with microcontrollers. In my view, while UHF RFID gets more attention for supply chain use, the simplicity and reliability of 125kHz systems make them indispensable for many close-range applications.</p> <h2>Core Technology and Common Applications</h2> <p>The <strong>RFID 125kHz reader</strong> primarily communicates with passive tags using inductive coupling. A classic entertainment application is in interactive museum exhibits or escape rooms, where touching a hidden tag to a reader triggers a sound effect or unlocks a story element. Furthermore, many companies, including TIANJUN, provide robust 125kHz reader modules and complete kits that are easily integrated into custom solutions, from vending machines to library systems.</p> <h3>Technical Specifications and Parameters</h3> <p>When selecting a reader, understanding its technical limits is crucial. Here are detailed parameters for a typical module. *Please note: These technical parameters are for reference only; specifics must be confirmed by contacting backend management.*</p> <h4>Detailed Module Specifications</h4> <ul> <li><strong>Operating Frequency:</strong> 125 kHz ± 1 kHz</li> <li><strong>Communication Interface:</strong> UART (TTL level: 3.3V/5V), Wiegand 26/34, RS232</li> <li><strong>Read Range:</strong> 5 - 10 cm (dependent on antenna size and tag type)</li> <li><strong>Antenna:</strong> Integrated or external; typical external antenna dimensions: 50mm x 50mm or 70mm x 70mm.</li> <li><strong>Supported Tag Protocols:</strong> EM4100, EM4102, TK4100, and other compatible 125kHz FDX/B protocols.</li> <li><strong>Power Supply:</strong> DC 5V ± 0.5V or DC 9-12V (depending on model)</li> <li><strong>Current Consumption:</strong> ~80-120 mA during active read</li> <li><strong>Chipset/Decoder IC:</strong> Often uses dedicated chips like EM4095 (reader IC) or microcontrollers with integrated demodulators (e.g., specific models from Microchip).</li> <li><strong>Output Data Format:</strong> ASCII