Tagsys S.A. LSP3STANDARD User Manual
May 2009
Revision 0.2
29/63
5.2.2 Wireless Synchronization
When more than two pedestals are installed, it is mandatory to install the Master on the far left or
right of the slave’s line for a better propagation and detection of the air synchronization burst.
right of the slave’s line for a better propagation and detection of the air synchronization burst.
Figure 11
below
shows an example of optimal configuration. Slaves must be placed with the
correct index corresponding to its physical location in order to carry other the token allowing
starting to scan its 3 own antennas before handing over the token to the next neighboring pedestal.
starting to scan its 3 own antennas before handing over the token to the next neighboring pedestal.
Figure 11: 3 Pedestals Configuration Example and Token Propagation
Red Arrow: Wireless Synchronization Token hand over
Blue arrows: Wire Synchronization Token hand over
5.2.3 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.
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.
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, half of the wireless time.
equal to N times Pt, half of the wireless time.
In this case the L-SP3 configuration settings have to be changed from “Wireless” to
“Hardwire” Synchronization in the L-SP3 Configuration Tool program, “Advanced Configuration”
last tab. See Figure 12 to see the correct fields to be modified. There will always be one & only one
last tab. See Figure 12 to see the correct fields to be modified. There will always be one & only one
In Standard Synchronization mode, section 5.2.1, if pedestals spacing
exceeds the recommendation of section 4.3.2 “Placement of Pedestals”,
wire synchronization becomes mandatory.
exceeds the recommendation of section 4.3.2 “Placement of Pedestals”,
wire synchronization becomes mandatory.