How the compatible RS2 Technologies 33-bit (R901592C) works
The RS2 Technologies 33-bit (R901592C) is a 125 kHz low-frequency proximity credential — the band most legacy prox readers use. Its data structure is 33-bit R901592C: parity + 2-bit site (FC 0-3) + 27-bit card + parity (even/odd). When you present a credential, the reader decodes that exact structure and passes it to your access-control panel as a card number it recognises.
We build the compatible RS2 Technologies 33-bit (R901592C) by encoding the identical data structure onto a programmable T5577 / EM4305 chip. Once written, the reader cannot tell the difference between our credential and the original — it presents the same bits, the same facility code, and the same card number. That is what "compatible by specification" means: not a generic look-alike, but a credential engineered to read exactly as the original does, matched to your facility code and card-number range.
To order, tell us the part number or format printed on your existing RS2 Technologies card, along with your facility code and card-number range, and our specialists confirm the encoding before anything ships. Bulk and reorder quantities are welcome — pricing is a fraction of OEM list, and every credential is verified to read on your existing equipment.
Also known as
R901592C · RS2 33-bit · RS2-HID FC 3 33-bit · RS2 Access It 33-bit · ASSA ABLOY IP lockset 33-bit
RS2 Technologies and all other brand and product names are trademarks of their respective owners. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, sponsored by, or endorsed by these companies. Brand and format names are used only to identify the systems our products are compatible with. MIFARE and DESFire are registered trademarks of NXP B.V.