TransCore 0596465PT15 Manuel D’Utilisation
Encompass 4H Reader System Guide
2-8
If the Encompass 4H Reader is installed in an overhead location, optimal tag position
is in the top center of the windshield in the area behind the rear view mirror or on the
vehicle’s front license plate or center bumper as illustrated in
is in the top center of the windshield in the area behind the rear view mirror or on the
vehicle’s front license plate or center bumper as illustrated in
.
Figure 2-5 Typical Tag Positions Used with Overhead Reader
Note: Metallized coatings on some vehicle windshields and windows shield the RF
energy emitted by the Encompass 4H Reader and may cause tags to be misread. Many
metallized windshields have areas that are not metallized in which the tag can be
placed and reasonable results achieved. If there are no openings in the metallized
coating in which to install an interior tag, install exterior-type tags on the exterior of
the vehicle.
energy emitted by the Encompass 4H Reader and may cause tags to be misread. Many
metallized windshields have areas that are not metallized in which the tag can be
placed and reasonable results achieved. If there are no openings in the metallized
coating in which to install an interior tag, install exterior-type tags on the exterior of
the vehicle.
Refer to Chapter
for more
detailed information on tag positioning.
Site Layout and Traffic Flow
The following site layout and traffic flow considerations are critical when determining
Encompass 4H Reader installation locations:
Encompass 4H Reader installation locations:
•
The Encompass 4H Reader read zone
•
Other Encompass 4H Reader units in the area
•
Lane configurations
•
Reflection, refraction, and diffraction of RF signals
•
Existing signal interference at the site