User's Guide

LSP3A Clear User’s Guide
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5.1.3 EAS Mode versus AFI Mode
EAS mode is only supported by the C370 or C370-L (NXP chip). AFI mode is supported by
most ISO15693 chips, from major chip manufacturers (NXP, Texas Instrument, STM, Infineon,
MeMarin…).
EAS digital burst is a prime number data stream of 128 bits which is read out after sending a
check EAS command to the Tag. This dedicated EAS command in only implemented in NXP SLI
chips.
The AFI (Application Family Identifier) is an 8bit-field defined in the ISO15693 standard but
not mandatory. Whenever issuing an inventory command with a specific AFI code, only Labels
with the same matching AFI code will reply with its UID. Generally the code 9E is used to say that
the book has not been properly checked out, thus will be detected by the pedestals.
5.2 Understanding the LSP3A Synchronization Process
5.2.1 Standard Synchronization Mode
To manage a group of pedestals, a synchronization burst is sent by the master pedestal to all
the slaves’ pedestals, a token being propagated back and forth as in a token ring process. This is
called the synchronization process.
 Only one pedestal is defined to be the master who emits a synchronization burst to the
next slave in close proximity who in turns emits it to the next slave and so forth.
 The other pedestals, configured as slaves, get the synchronization from the neighboring
pedestal and emits back to the next Slave of higher index.
Default Configuration of the LSP3A is set to Master 2 Pedestals.
Figure 5.1: Chronogram Sample (1 Master/ 4 Slaves)