TransCore encompass 4, Manual

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If the Encompass 4 Reader is installed on a pole or wall to the left of the vehicle, optimal tag position is on
the left side of the vehicle as illustrated in Figure 4 .
Figure 4 Typical Tag Positions for U.S. Driver’s Side Reader
Polarization
The polarization of the tag must be aligned in the same direction as the Encompass
4 Reader, as shown in Figure 2.
Note: Matching the tag and antenna polarization is critical to obtain optimal system performance.
Unobstructed Line of Sight
For optimum readability, install the Encompass 4 Reader and the vehicle’s tag so that when the vehicle
approaches the Encompass 4 Reader, the tag is directly facing the reader and the line of sight is clear
between the Encompass 4 Reader and the tag. If a fence or barrier is between the tag and the reader,
the Encompass 4 Reader cannot reliably read the tags. Figure 3 illustrates possible installation locations
of an Encompass 4 Reader in relation to a tag’s mounting location on a vehicle. If the tags are not in the
recommended location, reliable optimum operation requires lower vehicle speeds.
Figure 2 Tag and Reader Orientation
Figure 3 Encompass 4 Reader Location Relative to Tag Position
Chapter 2 Developing the Site Plan
TransCore Proprietary
2–7