User's Manual

CSI-Wireless LoCate-001 Users Manual
Revision 1.0 Page 8 6/11/2001
During the Armed mode the GPS receiver is immediately powered off after
getting a valid fix and determining that the vehicle has not moved. However, the
cellular transceiver will remain on for the duration of the ‘wake-up/status check’
cycle to listen for messages from the LNCC.
2.1.2 Geo-fences
At the time of the installation the LoCate-001 may be factory programmed with 3
Geo-fences, and defaulted to the first 0-25 mile fence as follows:
1. ID # 1, 0 to 1 miles radius
2. ID # 2, 0 to 25 miles radius
3. ID # 3, 0 to 50 miles radius
Users can change these by contacting the LNCC where commands can be sent to
the device to change the geo-fence. Alternatively they can execute these
commands via the web page interface. A geo-fence defines a boundary or a
geographic area calculated as a radius from a central point. Only one geo-fence
can be enabled at a time. The LoCate-001 will send a Status message to the
LNCC in the event that the vehicle crosses outside the fence selected.
Each Geo-fence is defined by the following parameters:
• ID (1-3) used to identify a particular constraint region. This value is created and
stored by the host, not by the LoCate-001.
• Type (out of only)
• Boundary –- circle with radius. Center of circle is Home Origin.
• Trigger - The LoCate-001 will generate an exception, when it has a valid GPS
fix, based on:
1. The vehicle crossing the geo-fence,
2. When the unit powers up outside a geo-fence.
2.1.3 Distance and Home Origin
One Latitude-Longitude position, referred to as Home Origin, can be kept in the
FCP EEPROM configuration memory. This data point is used to calculate the
radii of the selected geo-fence, and subsequently the distance from the center of
the circle. In the event that the vehicle exits this circle a trigger can be generated
and sent to the LNCC.
2.1.4 Differential GPS
The LoCate-001 does not support DGPS computations.
2.2 System Timing
The LoCate-001 unit maintains accurate system time necessary to support the
Armed Mode of operation. When the GPS receiver is active and can see at least
one GPS satellite the LoCate-001 system time is synchronized to the GPS time.