Avery Dennison RFID - Manual (Page 28)

HowToRFID
Revision: 13 Date: 31 August 2009
Page 28 of 53
4 RFID Transponder / tags / inlays
4.1 Memory layout (data fields) of RFID Tags
4.1.1 HF Technology
HF Technology is based on a flat memory model without separation into specialized memory areas. All data is
organized as blocks of memory with equal size.
Note: a block of memory can only be written as a whole. Write operations where the length of data provided is not a
multiple of the size of a block are padded with 00 bytes.
The data type ID is used in commands for reading or writing data to select the field of tag where the operation
should work with.
Field
[data type id] Contents / function Size in Bits (Bytes) Read / Write
access
Block data (User
data) [0] − is organized in blocks of 4 bytes (depending from chip
type)
− size varies (depending from chip type)
− blocks can by access only as a whole
See Table 1 –
Supported
transponder types Read / Write
UID [1] −
called Unique Identifier
− is a tag identifier (contains a chip manufacturer ID, a chip
type ID and a serial number)
− is defined in [ISO15693]
64 (8)
Read only
EAS Bit − used in electronic article surveillance (EAS) applications
− it a single bit which can be set or cleared (not set)
− can be locked permanently which blocks any future
modification attempt
1 Write / Lock
AFI [6] − AFI = Application Family Identifier
− can be used to filter out non application specific tags in
inventory operations
− is defined in [ISO15693]
8 (1) Write
DSFID [8] − DSFID = Data Storage Format Identifier
− is defined in [ISO15693]
HF: 8 (1) Read / Write
Table 11 – Data fields of HF tags
4.1.2 UHF Technology (EPC tags)
The data type id is used in commands for reading or writing data to select the field of tag where the operation
should work with.
Field
[data type ID] Contents / function Size in Bits (Bytes) Read / Write
access
EPC [2] − called Electronic Product Code
−
is a product identifier
− is defined in [EPC1]
96 (12)
64 (8)
up to 240 (30) Read / Write
TID [1] − called Tag Identifier
− is a tag identifier (contains a chip manufacturer ID, a chip
type ID and optional a serial number)
− is defined in [ISO15693] + [EPC1]
32 (4)
64 (8)
depending from
manufacturer Read only