User's Manual

3-7 EAS Function
3-7
3-10
The Reader/Writer supports the EAS (Electronic Article Surveillance)
system applied for anti-theft and other devices. The Reader/Writer
identifies the unique data string returned by the EAS-bit enabled Tags
and detects the existence of the Tags in the communication area. Multiple
EAS-bit enabled Tags that exist simultaneously can also be detected. The
Reader/Writer stops detecting the Tags by disabling the EAS bit on the
Tags. This is useful in preventing unauthorized removal of properties or
giving caution.
The function operates in either Online Mode, where the function is
executed by the commands issued by the connected host, or Offline Mode
where the function is executed by the Reader/Writer alone.
[Offline Mode]
In the Offline Mode, the EAS-bit enabled (non-disabled) Tags are
continuously detected. When the EAS-bit enabled Tags enter the
Antenna Communication Area and their EAS-response concordance rate
exceeds the specified value (=EAS threshold), the external output 1
(OUT1) will turn ON for the specified time. The operation state is visibly
identified by the OUT1 LED light. The EAS threshold and external
output time are specified by the Offline Mode Setting (FL) Command.
● EAS threshold
The Tags return 256-bit fixed data. The concordance rate at which the
Tag is recognized as one with non-disabled EAS (EAS-bit disable
processing is not performed) is specified by a percentage. The smaller the
concordance rate, the more lax the criteria becomes. The initial threshold
is 75%.
● The ON-time of the external output 1 (OUT1)
The ON-time is specified according to the output time of the lamp or
buzzer. The initial output time is 500ms.
[Online Mode]
The EAS Check (EA) Command is executed from the host. (Refer to
SECTION 5-5-10). The EAS-response concordance rate is returned, which
is compared to the threshold in the host and evaluated for the existence of
the EAS-enabled Tags.
■ EAS Setting for the Tag
The EAS on the Tag is enabled by a specific command that enables
EAS-bit. For the ISO/IEC chip (I.CODE SLI chip), it is done by the
System Write (SW) Command and for I.CODE1 chip, it is done by the
EAS Setting (ES) Command.