User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 21
Additionally, the Report Delay Flag can selectively suppress transmissions by
time of day, when used in conjunction with the Scheduled Hours, or based upon
the starting and stopping of motion. When set to “Start/Stop” reporting, the
device will send a new STATUS_MESSAGE, along with its most recently logged
position message, when the device first starts to move. It will continue to
compute and log position fixes while in route (for later retrieval if needed), but
these in route positions will not be automatically transmitted to the server
applications. Once the device has come back to rest, it will compute this stopped
position and transmit it to the server application.
Finally, the Report Delay Flag can alternate between logging messages and
transmitting messages. For instance, it can be configured to log five or ten
messages and transmit only the next one. This reduces communication costs
during “normal” operation, but if the need were to arise, there is more detailed
position history available for query on the device, which may be of interest if, for
instance, a tracked vehicle were involved in an accident or was suspected of
deviating from a desired route.
Diagnostics Mode
This feature enables or disables the LED. For covert installations, it may be
useful to disable the flashing LED.
Scheduled Reporting Mode
This feature allows the transmission of status and position information at some
pre-determined time regardless of how the Report Delay Flag may be set. At the
designated time each week or day, depending upon how the Scheduled Reporting
Mode is enabled, the TrimTrac 1.5 will transmit a new STATUS_MESSAGE
containing the current state of all monitored parameters, such as battery capacity,
alerts, geofence status and so on, plus the most recently logged
REPORT_POSITION. If the device had been unable to compute a new position
fix since the most recently REPORT_POSITION was logged, and there has been
recent motion, then the new STATUS_MESSAGE will have the Position Age flag
set to “1”.
Enabling this Scheduled Reporting Mode has the added benefit of the server
application knowing when the device will be connected to the GSM network. As
such, the server application could send messages in anticipation of the TrimTrac
1.5 being connected to the GSM network at the designated time. This is
particularly useful if the TrimTrac 1.5 is expected to be off the GSM network for
an extended period of time due to either being out of coverage or due to lack of
motion and long IDLE Timeout, T1, settings. Some GSM network operators may
delay when messages or data packets get delivered to mobile devices when the
mobile device has not been connected to the network for an extended period.