To exit Periodic Sleep mode, send the NMEA command
$PMTK225,0*2B
just after the module wakes up from a previous sleep cycle.
4.12.5. AlwaysLocate™ Modes
Not available on current production SL869-V2S SL869L-V2S (with enhanced ROM)
AlwaysLocate™ is an intelligent controller of the Periodic mode where the main supply
pin VCC_IN is still powered, but power distribution is controlled internally. Depending on
the environment and motion conditions, the module can autonomously and adaptively
adjust the parameters of the Periodic mode, e.g. RF on/off ratio and fix rate, to achieve a
balance in positioning accuracy and power consumption. The average current drain will
vary based on conditions.
To enter an AlwaysLocate mode, send the following NMEA command:
$PMTK225,<mode>*<checksum><CR><LF>
Where mode = 8 for AlwaysLocate (standby) mode or 9 for AlwaysLocate (backup) mode
Example: $PMTK225,9*22
The acknowledgement response for the command is:
$PMTK001,225,3*35
To exit AlwaysLocate mode, send the NMEA command:
$PMTK225,0*2B
just after the module wakes up from its previous sleep cycle.
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