User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 35 / 95
from specific satellites.
When the GNSS_VCC is valid, the GNSS part will enter into full on mode automatically. The following
table describes the default configuration of full on mode.
Table 10: Default Configuration of Full on Mode (GNSS Part)
Item Configuration Comment
Baud Rate 115200bps
Protocol NMEA RMC, VTG, GGA, GSA, GSV and GLL
Update Rate 1Hz
SBAS Enable
AIC Enable
LOCUS Disable
Easy Technology Enable
EASY will be disabled automatically when update
rate exceeds 1Hz.
GNSS GPS+BeiDou
In full on mode, the consumption complies with the following regulations:
When the GNSS part is powered on, the average current will rush to 40mA and last for a few seconds;
then the consumption will be decreased to the acquisition current marked in table 3 and we defined this
state as acquisition state, and also it will last for several minutes until it switches to tracking state
automatically. The consumption in tracking state is less than that in acquisition state. The value is also
listed in table 3.
Sending PMTK commands allows for switching among multiple positioning systems:
$PMTK353,0,0,0,0,1*2A: search BDS satellites only
$PMTK353,1,0,0,0,0*2A: search GPS satellites only
$PMTK353,1,0,0,0,1*2B: search GPS and BDS satellites
In all-in-one solution, make sure the GNSS part is powered on before sending these PMTK commands.
NOTE