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PGS Active RFID tag
systems offer a complete solution. to RFID integration. With a
standard range capability of over 350 feet and battery life
up to 5 years, this system provides the customer with
options previously not available with traditional passive RFID
tag technology. Passive tags typically are limited to no more
than 2 meters (6 feet) and usually only perform well only
within 2 feet. PGS Active RFID systems also include true
anti-collision algorithms and can read up to 50 tags per
second in multiple tag environments. A Windows
Application package is also available for fast integration
to existing company network systems.
System -
Operational Description ONLY
THREE COMPONENTS
RFID TAGS
 The
RFID Tags operate on a single 3 volt Lithium coin cell. They
are programmed to output data bursts that are received by the
RFID Reader. The interval between bursts can be varied from
continuous to several hours. In addition a data encoded Low
Battery condition is programmable depending on anticipated
battery capacity. (This is related to burst interval
requirements.) A Sensor Detect input is also provided for
remote switch monitoring. PGS RFID Tags incorporate
proprietary anti-collision schemes and forward error
correction (FEC). In a multiple Tag environment - 50 RFID Tags
can be read per second.
RFID TAG READER
The RFID TAG READER Circuit is comprised
of a Receiver, Microprocessor, and reader transmitter. The
receiver decodes, stores RFID IDs, and outputs real time Tag
data. RFID Tag entry, and exit times are logged. The real time
data stream may be binary encoded or ASCII at 115.2 KBPS User
selectable. The PGS Readers can have form factors varying from
fixed locations to handheld devices.
SOFTWARE
WINDOWS COMPATIBLE
click to see example
PGS has developed a
Windows (2000 / XP) compatible program that provides the
customer with RFID tag data management and data logging. Tag
identification, User/Product name, Time In, Time out, Sensor /
Alarm condition, and battery life are easily viewed with this
program.
WEB VIEWER
PGS can give clients the ability to
monitor the TAG Data from any web connected computer. This
provides the customer with access to the Tag data from any
location that is IP enabled (internet or intranet).
SPREAD SPECTRUM REPEATER
In locating, asset management, and
muster scenarios RFID tag information may need to be sent to a
remote central station(s). PGS provides a wireless 1
20 mile spread spectrum link capable of true peer to
peer MESH network transfer of data. The RFID tag
READERS can transfer local RFID tag data through a daisy chain
network to the remote central station.
FUNCTIONAL DESCRIPTION
The RFID Tag can be set to a range of
between 3 and 300 feet. When the RFID Receiver detects a Tag
it first determines if the decoded ID is a valid Tag ID. At
this point, the reader stores the tags entry and exit time in
its database and also provides a real time data stream to a
host computer.
GENERAL SOFTWARE DESCRIPTION:
RECEIVER STATES
1. SLEEP MODE
System is asleep, running on 32KHz
clock. Program is running looking for proper header from a
valid tag.
POWER CONSUMPTION
200 ua. 10:1 duty cycle
(Receiver requires this and is on all
the time)
2. WHEN A TAG COMES INTO RF DETECTION
RANGE
Microprocessor running at 32 kHz.
Sees tag header Valid and wakes up to full speed. Sends data
output in ASCII format to hosts Microprocessor.
POWER CONSUMPTION = 12 ma when
decoding.
3. SYSTEM RETURNS TO SLEEP MODE -
when no tag is in view.
PERFORMANCE:
PGS RFID READERS -have the ability
to read TAGS at approximately 50 tags / second if all tags
are transmitting continually. However, some clients RFID
tags will have a short duty cycle requirement. For Example,
1 transmission every 5 seconds. In this situation the
acquisition of tag IDs requires considerable more time in
the presence of multiple tags. At 5-second intervals, this
would require approximately 15 seconds to get all 50. This
is a function of statistical probability. The anti-collision
algorithm predicts that no two tags will collide two times
in a row.
PROXIMITY / ANTI COLLISION ALGORITHM
Tags can be placed directly on top
of each other. A
seeded proprietary random transmission pattern is
incorporated in the PGS RFID Transmitter protocol. This
anti-collision feature insures that no two specific tags
collide in any 2 sequential transmitter bursts. Bursts are
approximately 7.5 ms long. By nature of an active tag and
proprietary transmitter design PGS RFID TAGS do not become
desensitized, off frequency or de-tuned when in close
proximity. Further, the Radiation pattern is close to
isotropic so tags are seen by the reader at relatively
the same distance in any orientation. (No nulls)
GENERAL
SPECIFICATIONS:
RFID
READER:
FREQUENCY
916.5 MHz.
BOARD
SIZE
1.9 x 1.3 inches Approximate
RECEIVER
SENSITIVITY - 110db
SELECTIVITY
+/- 150 kHz Saw Filter Front End.
POWER
(3-Volt Internal Reg.)
RFID TAG:
FREQUENCY
916.5 MHz.
BOARD
SIZE
1.5 x .62 x .2 inches
STABILITY
SAW STABILIZED +/- 100 KHz.
ID
NUMBER
Over 2 million unique IDs
POWER
CR 2430 or smaller 3 volt Lithium **
POWER
CONSUMPTION 150 ua. To
3 ma.
SLEEP
2 ua.
DESCRIPTION Main Screen
The above screen is showing 8 RFID
tags. No tags are ACTIVE (within a readers range) at this
point. 5 Tags are showing an alarm condition. This
represents that one or more of the sensor switches on the
tags has been activated. For example, Projector # 03 may
have been moved from its location. Security # 21 may have
entered a restricted area. Mike has made 2 excursions
into a restricted area. No battery alarms are
present. Time in and out of reader range is logged as well
as the total time. Security Tag # 21 was in for the longest
at 87 seconds. Automatic scrolling has the capacity for 500
or more tags in the data base which can be reviewed at any
time.
TAG ENTRY
WINDOW: Tag description
DESCRIPTION
This screen represents what happens
when a previously unknown RFID Tag comes into view. (Tag #
16 was deliberately erased in the data base so that it
appears new). Tag # 16 came into view of the reader and
is not in the data base. The software prompts the
user to name the tag. From this point on the reader will
display the typed name for Tag # 16 whenever Tag # 16 is in
view. The bottom window is a real time display of the
complete TAG ID with Error Correction. This is a
hexadecimal number representing the 32bit Tag id and error
detection code.
Note that RFID
Tag # 23 assigned to projector 12 is ACTIVE.
This means the projector is in the proper readers range and
is being detected.
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