User's Manual

User Guide

WherePort III User Guide D948 Rev B

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WherePorts are defined as locked using the software of the SystemBuilder. No

setting in the WherePort is needed. After a tag pings that it has detected a locked

WherePort the tag will be ignored until it is unlocked. It is unlocked by detecting an

unlocked WherePort.

Tag movement must be clearly understood to make sure that a tag that enters a

locked WherePort field will also enter an unlocked WherePort field. If a tag is

inadvertently locked by a WherePort it will be ignored by the system until it enters the

field of an unlocked WherePort.

Typically locked WherePorts are used to track tags into a relatively small and

confined space. While tags are in this space they will be ignored. Upon leaving the space

they will pass an unlocked WherePort and from then on be tracked normally.

4.6 Multiple WherePorts

Some locations require more than one WherePort to insure adequate coverage. Examples

include a large parking lot, a long corridor, a large number of loading dock doors, or a

large doorway.

If a space is large enough, separate WherePorts with separate IDs may be used.

Problems arise with areas that must be monitored uniquely that are larger than the

coverage area of single WherePort. In this case the possible mounting options must be

considered.

The placement of WherePorts with overlapping coverage requires attention to a

number of issues. The first is phasing. Whenever the coverage fields of two or more

WherePorts overlap, the phases of the WherePorts must be set. When WherePorts are

phased, one is always designated as the master with its phase set to 0 (see Figure 26) and

all phased WherePorts must be set to the same ID.