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LSP3A Clear User’s Guide
It is only for internal use and shall not be spread without permission
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Synchronization burst: start burst to synchronize the gates (Period of T Scan ms)
Processing time (Pt): depends on the number of tags to be detected and the settings.
The fastest is when only detection is used (EAS burst or AFI), the slowest when all
features are used (AFI + Read AFI + Read 16 blocks of memory). Refer to the figures in
Table 3:Scanning Duration.
Synchronization process for 3 pedestals:
1- The master scans the configured chip, then sends the synchronization burst to Slave1
2- Slave1 scans the configured chip, then sends the synchronization burst to Slave2
3- Slave2 scans the configured chip, and then sends the synchronization burst back to
either the master when in hardwire mode.
This process is repeated indefinitely.
In case the master does not receive back the synchronization burst from the last slave after a
defined period, it will automatically restart the synchronization process.
The number of pedestals is not limited to any particular number as long as each gate is close
enough to its neighboring pedestal and that the overall scanning time does not exceed a few
100ms to allow for a safe detection at 1m/s pace trough any gate.
5.2.2 Synchronization by a pair of Wires
This mode is mandatory in noisy environments or when nearby RFID devices are placed too
near within a couple of meters from any pedestals preventing the installation using wireless
settings.
It is also mandatory when using too many pedestals (typically above 4 to 6 pedestals) as
wireless burst signal needs to go to the last slave N pedestal and then back going through all N
slaves before the master can scan its detection volume again. Processing time is thus equal to 2N
times Pt in wireless mode.
Using a synchronization cable, the token can be directly handed over by the last slave N to
the Master without having to go through all N Slaves pedestals again. Overall scanning time is
thus equal to N times Pt.
In this case the LSP3A synchronization by wire. Refer Figure 5.13 to see the correct fields to
be modified. There will always be one & only one LSP3A Master and all others pedestals set as
Slaves. Each pedestal is connected to the
other using ideally a twisted pair cable. This cable will propagate the synchronization signal to all
pedestals in a daisy chain.