User's Manual

User Guide
WherePort III User Guide D948 Rev B
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3.2 Coverage Areas
The size of the coverage area is significant as well as its location or placement. It is
important that the tag be released from a field when it is no longer in the area being
monitored by the WherePort.
There are three areas that are described for the field.
Guaranteed Capture All WhereTags at a given orientation will always be
pinged in this area.
Uncertainty A WhereTag may or may not be pinged in this area.
Guaranteed Release A WhereTag will never be pinged beyond this
range.
Since a tag may or may not be pinged in the uncertainty area, this area presents the most
challenge for a planner. If a single WherePort is installed, a tag that needs to be pinged
may not be and a tag that needs to be released may not be. These coverage areas must be
well understood to be able to set up a site. In the examples that follow these principles
will be translated into real applications.
A WhereTag moving through a WherePort field will typically change its orientation with
respect to the WherePort. As the orientation changes the effective range of the WherePort
will change.