User Manual Galileosky Base Block
20
Monitoring Data Transmission
The tracking device allows specifying the list of preferred GSM/3G-networks. The main
priority is given to the networks from the beginning of the list. Each network is specified with
country’s code and network operator’s code. Tracker supports up to 30 networks (OPS0
command, section
Data transmission settings
). If it is impossible to connect to one of the
preferred networks, the tracking device connects to any network but does not establish
connection to the server, thus, voice communication and SMS will be available according to a
service plan of the installed SIM-card.
The tracking device allows data transmission to the main and backup monitoring servers. The
tracker accounts transmitted data separately for each server, thus, both will receive full archive
with the track.
Data can be transmitted according to the Galileosky or EGTS protocol (Protocol command,
section
Data transmission settings
).
By using the EGTS protocol the device`s number parameter (ID command, section
Data
transmission settings
) specifies the object number by the authentification.
By using the Galileosky protocol transmitted data can be coded; XTEA3 algorithm
(http://tomstdenis.tripod.com/xtea.pdf) is used for coding. Commands, responses and photos
are not coded. The data are archived in the internal flash-memory by default. During long
periods without connection the oldest records of the internal flash-memory may be erased by
the new ones. In this case, it is recommended to insert a microSD card for HARD 3G/HARD
WI_FI modifications and to adjust archive transmission from it (Archive command, section
Service commands
).
Internal Archive Structure
The data archive can be stored on the internal flash memory or a micro-SD card. The internal
flash memory card is used by default.
The tracking device stores the data from all the inputs and interfaces, even when they have no
connected sensors, in the internal flash memory archive.
By using the internal flash memory, it is possible to choose the order in which points are sent to
the server.
By default, the data are saved in the depth of the data store, i.e. current data are saved before
older data. Transfer in chronological order can be set by FLASHARCHIVE command. After
changing the direction of memorizing data the flash memory will be formatted and all
previously stored data will be lost.
By using a micro-SD card the data are always sent in chronological order. Note that only
current data are used for the first packet.
