User's Manual

COBALT UHF-SERIES CHAPTER 5: COMMAND PROTOCOLS
PAGE 48 OF 140
5.2.1 RFID Commands - Note About the UHF-G2-525xx Tag
Memory Structure
The memory in Datalogic’s EPC Class 1 Gen 2 tag UHF-G2-525xx is organized in three
areas:
NAME DESCRIPTION SIZE
EPC
EPC memory according to
the EPCglobal standard
96 bit ( 12 bytes )
TID
Read Only Unique identifier 64 bits ( 8 bytes )
USER
User memory 512 bit ( 64 bytes )
Table 5-3: UHF-G2-525xxx Tag Memory Structure
EPC
EPC is a numbering scheme that allows assignment of a unique identifier to any
physical object. It can be regarded as the next generation of Universal Product Code
(UPC), which is used on most products today.
EPC enables the means to assign a unique identifier to each item, thus allowing
every item to be uniquely identified.
To have more details on the structure of the EPC memory area please consult:
EPC Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol
for Communications at 860 Mhz – 960 Mhz, Version 1.1.0 (December 17, 2005)
In our UHF-G2-525xx tag this memory area is preprogrammed with the TID unique
identifier and padded with zeroes. The user can change that but it’s important to note
that only tags with different EPC codes will be discriminated in a multitag reading
environment.
TID
This is a read-only area that holds a unique tag identifier number. This area can be
accessed using the common ABx/CBx Read ID commands.
USER
This is the normal data area that can be accessed using the common ABx/CBx
Read and Write commands.
NOTE: The fastest access memory is the EPC area. For applications where speed is
important the use of this memory is recommended.