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6
Basic Features
The device can be configured via serial cable by using the Telic Configuration tool otherwise
remotely via SMS and GPRS. Please contact Telic GmbH to have more details about the
configuration procedure.
6.1
Event Types
The Picotrack Endurance’s primarily task is to transmit GPS position data, including additional
status information via a TCP/IP connection to the tracking server. If a message can’t be
transmitted, it will be stored in the device to be transmitted later. There is a storage capacity of
about 1.000 position messages. The following events will generate a position message which
always contains the GPS position:
Time Event:
The end of a time period of x seconds (x being configurable).
Distance Event:
After a distance of x meters (straight line distance to the previous event) in any
direction (x being configurable) has been travelled.
Angular Change Event:
A direction change of a configurable minimum angle in x degrees (x
being configured) at a configurable minimum speed of y km/h (y being configurable).
6.2
Connection Establishment Procedure
The GSM and GPS modules will power up after switching on the Picotrack device. After logging in
into the GSM network the Picotrack will attempt to establish a GPRS communication link. Finally a
TCP/IP connection to the tracking server will be established to transmit the event messages.
The selection of the GSM network operator will take about 1 minute, plus the time to build up the
GPRS- and TCP/IP-connections to the tracking server. Therefore, after switching on the device, it
will take approximately 2-3 minutes until the first status message can be transmitted. Independent
of this procedure, GPS positions and status information will be generated and stored in the internal
memory for later transmission. Here follows the message structure:
6.3
Event Message Structure
The first identified and valid GPS position will be taken as the reference position for the distance
interval calculations. The next distance interval event will be generated if the configured distance
has been reached. If another event (e.g. time interval event) has been generated before, the
distance interval measurement starts again at the position of this new event. That means that any
position message with an actual GPS position sets a new reference for the distance interval
calculations. This reduces the number of messages sent while still keeping the desired resolution of
the track.
A position message will also be generated in the case of a direction change being greater than the
configured angle while travelling at the configured minimum speed.
In situations where no new valid GPS position is available, the last valid position will be
transmitted.
Content
Description
Event/Log -Code
Reason for the status message
Event/Log Timestamp
Time at which the event has happened