Old revisions Add to book Export to PDF Book Creator Add this page to your book Book Creator Remove this page from your book Manage book (0 page(s)) Help OSDP(Open Supervised Device Protocol) The standard RS-485 protocol developed by enhancing the Wiegand interface, through which only unidirectional communication from a reader to a controller was possible. This protocol enables processing of large amounts of data in a bidirectional reader-controller communication environment, as well as transmitting biometric data. Supporting this protocol also enables connectivity between third-party devices, so you can simply replace an existing system's items as necessary. See Also What is OSDP?