Helios Users Guide
www.starcomgpsglobal.com 128
Appendix A – Unit Communication in Starcom Systems
Helios is the mobile component of Starcom’s advanced vehicle tracking and
fleet management system. The system uses advanced software algorithms for
field tracking of vehicles and provides customers with a selection of real-time
information about the tracked vehicle. The following image illustrates the
Starcom Systems communication channels.
The unit transmits messages according to the values specified in Helios
Parameters > Transmission Rates settings (GPRS, SMS).
When the unit’s modem is turned on, it tries to connect to the network and
transmit via GPRS (4 attempts: 2 on the first server and 2 on the second
server). If it fails to connect to the network, it will switch to the SMS channel (if
it is configured to transmit via SMS) after about 4 minutes, because it makes
four attempts to connect via GPRS. It will constantly try to transmit via SMS.
The next attempt to transmit via GPRS will be repeated in 5 minutes. Every 5
minutes, the unit will attempt to connect to the network and transmit via
GPRS. This process is illustrated in the following figure.
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