Figure 16: Periodic Mode Example 2
To enter a Periodic mode, send the following NMEA command(s):
$PMTK223,<SV>,<SNR>,<Extension threshold>,<Extension gap>*<checksum>
(Optional)
Where:
SV = 1 to 4, default = 1
SNR = 25 to 30, default = 28
Ext. threshold = 40 000 to 180 000 ms, default = 180 000
Ext. gap = 0 to 3 600 000 ms, default = 180 000
This is the limit between successive DEE
$PMTK225,<Type>,<Run_time>,<Sleep_time>,<2
nd
_run_time>,<2
nd
_sleep_time>*<chec
kum>
Where:
Type = 1 for Periodic (backup) mode or 2 for Periodic (standby) mode
Run_time = Full Power period (ms)
Sleep_time = Standby period (ms)
2nd_run_time = Full Power period (ms) for extended acquisition if GNSS acquisition fails
during Run_time
2nd_sleep_time = Standby period (ms) for extended sleep if GNSS acquisition fails during
Run_time
Example: $PMTK225,1,3000,12000,18000,72000*16
for periodic mode with 3 s navigation and 12 s sleep in backup state.
The acknowledgement response for the command is:
$PMTK001,225,3*35
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