User's Manual
User Guide
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User Guide, WherePort IV D1300 REV A
© Copyright WhereNet, Corp. 2008 WhereNet Confidential
Where room coverage is needed the RTLS algorithm could indicate that a tag is outside a room when it is
not.
WherePort IVs are defined as locked using the software of the SystemBuilder. No setting in the
WherePort IV is needed. After a tag pings that it has detected a locked WherePort IV the tag will be
ignored until it is unlocked. It is unlocked by detecting an unlocked WherePort IV.
Tag movement must be clearly understood to make sure that a tag that enters a locked WherePort IV
field will also enter an unlocked WherePort IV field. If a tag is inadvertently locked by a WherePort IV it
will be ignored by the system until it enters the field of an unlocked WherePort IV.
Typically locked WherePort IVs 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
IV and from then on be tracked normally.
8.6. Multiple WherePort IVs
Some locations require more than one WherePort IV to insure adequate coverage. Examples include a
long corridor, a large number of loading dock doors (from the inside), or a large doorway.
If a space is large enough, separate WherePort IVs 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 IV. In
this case the possible mounting options must be considered.
The placement of WherePort IVs with overlapping coverage requires attention to a number of issues. The
first is phasing. Whenever the coverage fields of two or more WherePort IVs overlap, the phases of the
WherePort IVs must be set. When WherePort IVs are phased, one is always designated as the master
with its phase set to 0 (see Figure 115) and all phased WherePort IVs must be set to the same ID.