User's Manual

User Guide

WherePort III User Guide D948 Rev B

All other trademarks are the property of their respective owners. ZES Confidential

2 THE WHERETAG

The WhereTag (Figure 5) is pinged by the WherePort and responds by transmitting a

data message to the RTLS. The WhereTag is a small device with a magnetic pick up coil

and a RF transmitter. It is mounted to movable assets such as trailers, vehicle assemblies,

or storage bins. It transmits a programmable blink signal. When operating without the

WherePort, the blink is received by at least three sensors which enable the system to

locate the tag accurately on the site.

The WherePort signal is received by a pick up coil in the WhereTag. In the

WhereTag III the coil is oriented along the length of the tag. In WhereTag II it is rotated

30º away from the length of the tag.

Figure 5 The WhereTag III and WhereTag III ST

The solid line shows the orientation of the pick up coil for both

WhereTags.

2.1 WhereTag Responses

The tag can be programmed to respond in a variety ways when it detects a WherePort

signal. There are three defined modes (see Figure 6).

Mode 1 The tag enters the field, blinks and then blinks again if it is still in

the field after the retrigger time out.

Mode 2 The tag enter the field, blinks and then does not blink again until it

leaves the field and the retrigger time out expires.

Mode 3 The tag enters the field, blinks and then blinks again after it has left

the field and the retrigger time out expires.

Coil Orientation