12.2 Pearl RF Signal
GO sends a Pearl RF signal every 7 hours and this will be received by the Chiptech base unit it is
learned into, when it is within range (approximately 300m in open air). GO sends a unique number
so it can be identified by the Chiptech base unit. This ensures GO is able to communicate to the base
unit that it has been paired with, so it will operate as expected in an emergency. The lack of a Pearl
RF signal over a period of time is reported to monitoring by the base unit. This allows monitoring to
know that GO has been out of range of the base unit for a period of time. This can be used as an
early indication that GO may have been lost and Lost Mode report to GPS mapping software can be
checked for its location.
12.3 Flight Mode
When Flight Mode is enabled, a report will be sent to monitoring. This is used as a reference for
monitoring to check when other reports may be missing.
This report will usually takes less than a minute; however it can take up to 16 minutes if GO
continues to try and send the Flight Mode report and is unable to do so. (This is also dependent on
the low priority retry attempts assigned in the customer configuration.)
A Flight Mode restore report is sent when GO is taken out of Flight Mode.
Real Time Clock (RTC)
GO contains a very low powered system clock to keep track of the current time. The clock must be low
powered to ensure that it does not flatten the battery on GO too quickly. A consequence of using a
low powered clock is that it is less accurate. The clock needs to be updated once every 48 hours by
performing a 3G connection (automatic), to ensure that the time does not drift by more than 10
minutes. The system clock is used for notifications, log entries and night time hours.
Automated Internal Safety Tests
14.1 Periodic System Checks
• GO will periodically check the memory of the device including the program flash, configuration
flash and system RAM.
• These checks occur in the background, where the usability of GO will not be affected.
14.2 Flash Memory Check
• If an error is found in flash memory (non-volatile memory), GO will reset.
• Upon reset another flash check will run. If an error is found here, the memory is treated as
corrupted, as this means that GO may no longer function correctly or reliably.
• A simple beep will play continually, and the light around GO will flash red.
• All other functionality will cease to operate.
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