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Teletrac, Inc. - Prism TM Information and Installation Guide
In Motion detection
The Prism TM will be capable of detecting when the vehicle
is stationary or moving with +/- 1 mph accuracy. Upon
detecting either of the events, the Prism TM can send
messages or begin timers. The ultimate goal of this feature
is to eliminate locations unless the vehicle is moving or the ignition is on, which will save location
units. (Min. detectable speed is 3 mph due to jitter)
This feature can be used to perform several capabilities currently being done by Fleet Director but
without the high rate of location requests and possibility of missed information. For example, this
feature can be used as a security feature to determine if a vehicle is parked where is supposed to
be without the use of Landmarks or Exception Conditions and the workstation does not have to
locate the vehicle every 15 minutes to see if it is still stationary. With this feature the Prism TM
will identify that it is stationary and send a message upon detecting movement. Once in motion,
the Prism TM can send locates on a regular bases to keep the workstation up to date. This
prevents the problems of unnecessary locations and status change requirements to get a
different location. Since the Prism TM locates itself, there is no dropped/lost information. This
feature may be used in place of the zone feature for security applications.
Zone Compliance or Landmark Detection
The feature of Zone Compliance is the capability to store a set of coordinates inside the Prism
TM that make up an area called a zone. The Prism TM can then perform certain actions upon
detecting where the vehicle is in relation to the zone. This function acts similar to Exception
Conditions in the Fleet Director software depending on how it is programmed. Upon entering or
leaving a zone, the Prism TM can send a message or change its operating condition. To most
people it is obvious what zone
compliance means due to the Fleet
Director's current standards, but
with the Prism TM having the
internal zone capabilities, a whole
new level of zone compliance is
capable.
A few examples of this new
capability would be that by setting
up a zone around a customer's
yard, the truck driver is no longer
required to press an "In Yard" or
"Left Yard" button. When set up
around a customer site, the driver
Note: Be sure to make the
Hysteresis smaller than the
smallest distance to the zone
edge. Otherwise, if the
Hysteresis is less than your
perimeter distance from the
center the interior Hysteresis will
be the perimeter zone
24
50 M
50 M
would no longer be required to send a message if he was at
a site too long, nor would Fleet Director have to time the "At
Site" condition or locate the vehicle to insure it is still there.
And, when combined with the In Motion Detection feature,
the customer would not have to locate his truck all night
long to make sure it has not left the yard due to theft.
For Example
< 4 mph
6 mph<
Stationary
In Motion
Actual Zone Perimeter
200 Meters
text
text
Center of
Zone
Interior Hysteresis
No Mans Land
No Mans Land
1622-0300 B1 3/18/04
Not to Scale
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