User's Manual

User Guide

WherePort III User Guide D948 Rev B

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2.2 Using the WherePort ID

The tag response can also be changed by the WherePort. Ports with ids from 0 to 255 are

used only when the alternate blink mode is required. These reserved ids are split evenly

between IDs (128 – 255) to mark the entrance of tag into the field and ids (0 - 127) to

mark the exit of a tag from the field. The significance of other tag IDs is shown in Table

WherePorts can turn tags on and off as they enter and leave a site. As an example,

WhereTags can be permanently mounted to trailers. These trailers need to be tracked

while they are on the site, but not after they leave. There is no need for the tag to continue

to blink while it is off site. WherePorts positioned at entry and exit gates can turn the tags

on when the trailers enter the yard, and off when they leave.

Table 3 WherePort IDs

ID Range Tag Response

Standard WP

Response

Added Function

0 - 127 Yes Exit Alternate Blink Mode

128 - 255 Yes Enter Alternate Blink Mode

256 - 32,767 Yes

32,768 - 65,534 Yes (ID - 32,768 reported)

65,535 Yes + Response is data register