Rockwell Automation 56RF RFID System User Manual - Manual (Page 19)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 19
RFID Components Chapter 2
Data Storage Format Identifier (DSFID)
The DSFID indicates how data is structured in the tag memory. It may be
programmed and locked by the respective commands. It is coded on one byte. It
allows for instant knowledge on the logical organization of the data.
Electronic Article Surveillance (EAS)
EAS is a technology typically used to prevent shoplifting in retail establishments.
An EAS detection system will detect active tags and set off an alarm.
EAS status is 1 bit data (LSB side), which is stored in the system area of a tag. The
initial value is “1”. EAS bit “1” means goods-monitoring status, and EAS bit “0”
means that goods-monitoring status is cleared.
Smart Label Integrated Circuit (SLI)
SLI tags use an EEPROM (electrically erasable programmable read only
memory) to store data. The 1024 bit EEPROM memory is divided into
32 blocks. Each block consists of 4 bytes (1 block = 32 bits). Bit 0 in each byte
represents the least significant bit (LSB) and bit 7 the most significant bit (MSB),
respectively.
Table 7 - SLI Tags
Block Byte 0 Byte 1 Byte 2 Byte 3 Description
-4 UID0 UID1 UID2 UID3 Unique identifier (lower bytes)
-3 UID4 UID5 UID6 UID7 Unique identifier (higher bytes)
-2 Internally
used EAS AFI DSFID EAS, AFI, DSFID
-1 00 00 00 00 Write access conditions
0 User Data
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