9
MessengerBLE
User Guide
acknowledged. This store and forward memory is non-volatile and remains intact
during power off.
1.3.4
Real-Time Clock (RTC)
The RTC is used to timestamp data records and events. All messages sent to the host
server contain a timestamp to provide a chronology of data/events to the end user.
This timestamp is UTC time. All timestamps viewed from the debug menu are local
time based on the configured time zone.
The RTC is battery backed to provide time keeping during power off. If the RTC is
configured to be automatically set, the Messenger will set time after every power on
and perform a time check every midnight. If the RTC time differs from actual time by
more than 30 seconds, the RTC time will be adjusted.
The RTC can be set in one of the following ways:
Method
Description
Automatic
via Cell
This is the default setting. The
Messenger will set the RTC from an
internet NIST time server.
Automatic
via GPS
The Messenger will set the RTC from
the date/time read from the GPS
module.
Manually
Set the time via the Debug port
through the Maintenance menu.
OTA/SMS
The RTC is set from an OTA config
command or an SMS config
command.
Configuration settings are available to define how the RTC is set.
1.3.5
Packaging
The Messenger is packaged in an automotive grade Deutsch enclosure. There are 2
antenna connections, one SMA connection for the GPS and one SMA-RP (reverse
polarity) connection for cellular. The enclosure end-cap provides 2 circular M12, 8-pin
connectors for power and IO.