AFI (Applikation Family Identifier) for libraries
ISO TC46/SC4/WG11 RFID in libraries
Hosted by Danish Agency for Libraries and Media
Last update: 17 February 2009
The AFI (Application Family Identifier) is a mechanism used in the data protocol and the air interface protocol to select a class of RFID tags relevant to an application, or aspect of an application, and to ignore further communications with other classes of RFID tags with different identifiers
The AFI is a single byte code, often in the systems memory of the tag.
AFI assigned to libraries
On request by EDItEUR, NISO and Danish Standards The Data Constructs Steering Group of ISO/IEC 15961 has allocated RFID Data Constructs including AFI value C2 (hexadecimal) (also written: C2HEX) explicitly for library use.
If the AFI is used for security purposes, the AFI value ”C2” is for items out for loan. For items in stock are
used AFI value ”
See letter from Secretary Data Constructs Steering Group:
EDItEUR has followed up with explanations and instructions:
A library may use the AFI in one of two ways:
· It may use a single AFI, the value C2HEX assigned under the registration of ISO/IEC 15961-2. This distinguishes library items from all others, and avoids the risk of an RFID reader in another domain reading the RFID tag on a loan item and confusing its encoded content with data in an application outside the library domain. It also enables a library system to reject items that carry a different AFI code, possibly from another domain visited by a client.
· The AFI may additionally be used as part of an "item security system" where the AFI value C2HEX is written to tags for items that are on loan to a client. When the books are returned, an in-stock AFI (07 HEX, as agreed by JTC1 SC31 WG4 SG1 to be included in 15961-3) is written to the tag.
ISO/IEC 15961:2004 Information technology -- Radio frequency identification (RFID) for item management -- Data protocol: application interface
Link to ISO/IEC