Chapter II: S8 mainframe
II.1 The outlook of mainframe
The mainframe has an almost cylindrical shape, with a base larger than the height. There are
three parts: an upper cap, a rubber loop and the main structure. The upper cap protects the
GNSS antenna placed inside. The rubber loop has the function of softening possible shocks or
falls. In the front of the main structure there are 2 keys and 9 lights, on the bottom side there is
one slot for the built-in radio and GSM/GPRS module, and one for the battery and SIM card. All
the others components of the receiver (Bluetooth device, main board, OEM board, etc.) are
contained inside the main structure.
Fig. 2.1 - S8 mainframe
II.2 Interfaces
The mainframe interfaces are shown in Fig. 2.2: the left port (five pins LEMO) is used for
external power supply and external radio, the right port (seven pins LEMO) is used for data
transferring between receiver and computer or between receiver and the handheld. Near the
radio module there is the radio antenna interface.
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