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copied!<h2>RFID Standards:</h2> <p><br /></p> <ul> <li><p><strong>125 Khz</strong> (<em>low-frequency</em>) tags are write-once/read-many, and usually only contain a small (<em>permanent</em>) unique identification number.</p></li> <li><p><strong>13.56 Mhz</strong> (<em>high-frequency</em>) tags are usually read/write, they can typically store about 1 to 2 kilbytes of data in addition to their preset (<em>permanent</em>) unique ID number.</p></li> <li><p><strong>860-960 Mhz</strong> (<em>ultra-high-frequency</em>) tags are typically read/write and can have much larger information storage capacity (I think that 64 KB is the highest currently available for passive tags) in addition to their preset (<em>permanent</em>) unique ID number. <br /><br /></p></li> </ul> <h2>More Information</h2> <p><br /> Most read/write tags can be locked to prevent further writing to specific data-blocks in the tag's internal memory, while leaving other blocks unlocked. Different tag manufacturers make their tags differently, though.</p> <p>Depending on your intended application, you might have to program your own microcontroller to interface with an embedded RFID read/write module using a manufacturer-specific protocol. That's certainly a lot cheaper than buying a complete RFID read/write unit, as they can cost several thousand dollars. With a custom solution, you can build you own unit that does specifically what you want for as little as $200. <br /><br /></p> <h2>Links</h2> <p><br /></p> <p><a href="http://www.rfidjournal.com/" rel="noreferrer">RFID Journal</a></p> <p><a href="http://www.rfidtoys.net/" rel="noreferrer">RFID Toys (Book) Website</a></p> <p><a href="http://www.skyetek.com" rel="noreferrer">SkyTek - RFID reader manufacturing company</a> (you can buy their products through third-party retailers & wholesalers like <a href="http://mouser.com/" rel="noreferrer">Mouser</a>)</p> <p><a href="http://www.trossenrobotics.com/" rel="noreferrer">Trossen Robotics</a> - You can buy RFID tags and readers (125 Khz & 13.56 Mhz) from here, among other things</p>

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