Page 9 of 10
3 Configuration
The GTTS-2000Bi‘s are shipped from factory in a pre-configured state.
The customers desired configuration is passed to GTTSystems B.V. by the dealers. The units are then
configured, tested, packed and shipped. Please note that GTTS-2000Bi configurations are setup in
such a way that the battery life span is optimized without compromising too much in reporting time
intervals and customers applications.
Configuration can be altered “over the air”, but the reporting time interval can never be set smaller
than one minute and never bigger than 25 days.
A dedicated Windows® Platform computer configuration tool allows dealers to (re)configure or select a
configuration and set a variety of setting like reporting frequency etc..
3.2 Battery life
The GTTS-2000Bi is equipped with a 5.8 Volts / 15,6Ah Lithium/Sulfur dioxide(Li-SO2) battery.
Contradictory to other batteries e.g. alkaline or so, is that the cell voltage does not drop if the battery
wears and therefore it is difficult to measure the actual battery conditions. However, there are methods
to measure the remaining capacity, but this would cause conflicts in the GTTS-2000Bi electronic
circuits and software. Therefore calculations and measurements were made to determine the power
consumption of every circuit in the GTTS-2000Bi. Timers in the GTTS-2000Bi register the period of
time every consuming circuit is active. The unit automatically will send a “Battery Status Message”
every week.
Taking in count the self-discharge of the battery, average time to get a GPS fix and the average time
needed on the Iridium network to send a message, a prognoses of the battery life span related to
several reporting time interval was calculated.
Depending on the reporting frequency the estimated amount of reports is 2000 -9000 on one battery.
This could result in the following scheme:
12 reports and a total of 24 positions per day (±10000 reports) battery life span 2.2 years
8 reports and a total of 16 positions per day (±9000 reports) battery life span 3.2 years
6 reports and a total of 16 positions per day (±7500 reports) battery life span 3.6 years
4 reports and a total of 16 positions per day (±6000 reports) battery life span 4.2 years
2 reports and a total of 16 positions per day (±3650 reports) battery life span 5.0 years
1 reports and a total of 16 positions per day (±2000 reports) battery life span 5.5 years
1 reports and a total of 1 position per day (±3650 reports) battery life span 10 years
These life spans are estimated and depend on a lot of conditions like e.g. working temperature, time
needed to get a GPS fix etc.
Therefore it is of the utmost importance that the GTTS-2000Bi is placed horizontally with a clear view
to the sky above to obtain a GPS fix and Iridium network connection the shortest amount of time.
In no event GTTSystems B.V. will be liable for battery wear.
4 Replacement of the battery
If the battery needs to be replaced, we advice to return the GTTS-2000Bi to the service department of
your dealer.
Along with the battery, the gasket in the lid of the unit, shall also be replaced to ensure optimum
moisture ingress protection.
The dealer will either replace the battery and gasket in their own service department or have the unit
shipped to the service department of GTTSystems B.V. for refurbishment.
