CelloTrack LTE Plus Overview
CelloTrack XT LTE Overview.docx Page 26 of 40
Copyright © 2020 by Pointer Telocation, Ltd.
Offline tracking data
upload session
If offline tracking is enabled, the unit transmits all
messages collected during the trip at the end of the
trip (and after a preprogrammed time has elapsed).
Refer to the Error! Reference source not found.
ection on page Error! Bookmark not defined..
Maintenance server
sessions
The unit periodically connects to a maintenance server
for firmware and configuration upgrades. Typically
this is done once per day.
The unit never enters the Tracking state, but does,
however, send start and stop messages when
movement is detected or ends. Refer to the Error!
eference source not found. section on page Error!
Bookmark not defined.
During Hibernation, GPRS messages are not received by the unit and not stored in the
cellular network – thus they are lost. However, SMS messages that are sent by the
system are received by the unit during glancing.
5.2.1 Glancing
The periodical wake up and location update process is known as Glancing. During
Glancing, the unit is fully operational, the GSM and GNSS modules are powered up
(when the GNSS is powered the navigation SYS LED blinks every 2 seconds), and the
RS232 port is operational.
By default, Glancing occurs according to a configurable time period. Alternatively, you
can configure Glancing to occur at a specified time of the day (see the Error!
eference source not found. section on page Error! Bookmark not defined.) or
enable both modes. If both modes are enabled they are maintained in parallel and
independently.
The Glancing frequency depends on the following two periods (for more information,
refer to the CelloTrack Programming Manual):
The glancing duration (programmable).
The sleep period between location updates – this is dependent on whether the unit
is in motion.
This combination is known as adaptive glancing frequency.
The GNSS module remains active until a successful GNSS acquisition occurs or until
the dedicated GNSS timeout expires.
The GSM module is activated for a pre-programmed time. When this ends, the next
Glancing cycle begins. Thus it is the GSM duration which actually defines the duration
of the Glancing cycle.
Typically, the GSM duration must be no shorter than two minutes in order to
accomplish GSM registration, GPRS dial up, and reception of SMS commands sent from
the back end application during Hibernation.
30 seconds before the end of Glancing, the unit sends an update message and the
GNSS data. If GNSS acquisition fails during the current Glancing session, the last
known GNSS data is sent. This message can either be sent as a regular event and/or
configured as a distress session.
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General