NT132 System Overview
© 1999, AXCESS
TM
Inc.
750.001.003
Revised June 1999
15
Tags
A Tag is a very small transponder (trans responder) that
remains in a sleep state (off) until awakened. When the Tag receives
a special wake-up signal from the Reader, the Tag will wake up (turn
on) and emit a radio signal of its own. The signal emitted by the Tag
is typically its pre-programmed identification number – but could
include other data as well. The signal is generally used for detection,
identification and location of people or objects.
An AXCESS Tag, encased in black or beige plastic, is about the size
of a credit card and is approximately 200 mils thick. Some Tags have
slots to attach personnel ID pictures to them. Other Tags may be
attached permanently to vehicles or assets such as computers.
Types of Tags
The typical types of Tags are:
Passive Tags
A passive tag does not have an on-board power source (battery). It is
powered from the antenna radiation field of the transmitter that is
trying to wake the tag up. It uses the same antenna for transmitting
and receiving.
Active Tags
An active tag has its own battery and is capable of a greater transmit
distance (range) than the passive tag. An active tag only has a
transmitting antenna. It is common for active tags to continually
transmit and the system will only report those tags in the reception
field.
AXCESS Tags
AXCESS Tags, based on AXCESS NeuroTag technology, are a
hybrid of active/passive and do not respond until awakened. The tag
is in a “sleep” state that requires almost no power until the tag is
activated. AXCESS Tags receive on a low frequency and transmit on
an ultra high frequency.
The Tag checks the wakeup signal for proper modulation and a
Reader ID code, then transmits its own ID number along with the
Reader ID that woke it up.