GalileoSky GLONASS User Manual
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Contents
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GalileoSky GLONASS/GPS v5.1 (223) User’s ManualGalileoSky Ltd Page 21The second algorithm is always used for remote firmware updating; the Terminal attempts to get theconnection to the server with firmware through SIM 0, and if it fails - through SIM 1.7.10 GPRS traffic costs optimizationGPRS-traffic costs decrease by online monitoring may be reached by following these advices:1. Turn off the transmission of unused data, for example temperature, acceleration, analog and digital inputsvalues which have no connected sensors. It can be made in the Configurator on Settings/Protocol tab or byMainPack and HeadPack commands (section Server exchange protocol settings).2. Increase points record period. It can be made in the Configurator on Settings/Track tab or by WrPeriodcommand (section Track parameters settings).3. Increase turning angle at which the device records a point, and distance at exceed of which the point isrecorded. It can be made in the Configurator on Settings/Tracks tab or by Turning command (section Trackparameters settings).4. Find out the time of disconnection because of the Terminal inactiveness from the server softwaredevelopers. This parameter should be taken into account by points’ record period setting otherwise thetraffic will increase because of costs for restoring connection to the server. Example: points’ record period ata stop is 1200 seconds (20 minutes), the server disconnection because of the terminal inactiveness is 180seconds (3 minutes). The Terminal determines that a vehicle has stopped and switches on a timer for thenext point record in 20 minutes, in 3 minutes the server disconnects as it hasn’t received the data from theTerminal. The Terminal tries to reconnect the server at once. It happens 6 times, and only in 20 minutes theTerminal sends the next point. As a result, traffic costs considerably exceed savings from points recordinterval increase.5. Set filtering of coordinates at a stop so as the Terminal can correctly chose points’ record period. TheTerminal can determine a stop according to several elements: accelerometer data (AccSens command, section Track parameters setting); external supply voltage (MHours command, section Track parameters setting); ignition sensor indications (Ignition command, section Track parameters setting).If continuous online monitoring is not necessary, it is possible to set packet data transmission (section Stelsmode and packet data transmission). In this case, the device will periodically contact, send the data from theblackbox and disconnect from the server. Savings are due to decrease of costs for one data packettransmission as when sending data from the archive a packet size may be up to 1000 byte, and by onlinemonitoring usually one point is sent (a few tens of bytes). At the same time, the Terminal operation from thebattery increases as during server disconnection periods the device switches off GSM/3G-unit.7.11 Operation in international roamingThe Terminal allows setting special parameters of data transmission in the international and national roaming(Roaming command, section Data transmission settings). After registration in GSM/3G-network the Terminalreceives code of the country and code of the operator from base station and compares them with the setones, if they do not match, the Terminal is in roaming. It is possible to specify only code of country(international roaming) or code of country and code of operator (national roaming). Being in roaming, theTerminal constantly supports registration in GSM/3G-network but initializes GPRS-session only according tothe schedule, thus it is always possible to make a call to the terminal or send SMS with a command anddecrease GPRS-traffic costs. For GPRS-session the maximum volume of transmitted data in bytes isdetermined. Each cellular operator has minimum tariffing interval in roaming, it is recommended to setmaximum data volume equal to half of this interval (the second half is for official traffic TCP/IP, the volumeof which depends on connection quality). By archive transmission from internal flash-memory, the Terminalalways unloads according to the archive settings (FLASHARCHIVE command, section Service commands). Byarchive transmission from microSD-card it is recommended to set coordinates transmission and sensorsindications in the first packet, thus the Terminal sends one point with a current vehicle coordinate and theoldest unloaded archive part. The data from the microSD-card are unloaded in chronological order. |
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