Gotop GT-1612-MTBD, Руководство пользователя

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GT-1612-MTBD
GPS&Beidou Receiver Module
www.gotop-zzu.com Page 14 of 35 Revision: V2.0.1-January 2015
Example
$PMTK225,1,3000,12000,18000,72000*16<CR><LF>
$PMTK225,2,3000,12000,18000,72000*15<CR><LF>
Sending “$PMTK225,0*2B” in any time will make the module enter into full on mode from periodic standby
mode.
Sending “$PMTK225,0*2B” just in Run_time or 2nd_run_time can make the module enter into full on mode
from periodic backup mode.

The precondition is that the external switch circuit supports periodic backup mode. For details, please refer to
chapter 2.4.3
.

Before entering into periodic backup mode, please ensure the GPS_EN signal is low and power supply for VBAT
is alive.
The following figure has shown the operation of periodic mode. When you send PMTK command, the module
will be in the full on mode firstly. After several minutes, the module will enter into the periodic mode and follow the
parameters set by you. When the module fails to fix the position in
run_time , the module will switch to
2nd_run_time and 2nd_sleep_time automatically. As long as the module fixes the position again, the module will
return to
Run_time
and
Sleep_time
.
Please ensure the module is in the tracking state before entering into periodic mode. Otherwise, the module will
have a risk of failure to track the satellites. If GPS&Beidou module is located in weak signal environment, it is better
to set a longer
2nd_run_time to ensure the success of re-acquisition.
The average current value can be calculated by the following formula:
I
periodic
= (I
tracking
× T1+I
standby/backup
× T2)/ (T1+T2) T1: Run_time , T2: Sleep_time
Example
PMTK225,2,3000,12000,18000,72000*15 for periodic mode with 3s in tracking mode and 12s in standby mode.
The average current consumption is calculated below:
I
periodic
= (I
tracking
× T1+I
standby
× T2 )/(T1+T2)=(20mA× 3s + 1mA× 12s)/(3s+12s)≈4.8 (mA)
PMTK225,1,3000,12000,18000,72000*16 for periodic mode with 3s in tracking mode and 12s in backup
mode. The average current consumption is calculated below:
I
periodic
= (I
tracking
× T1+I
backup
× T2)/ (T1+T2)=(20mA× 3s + 0.007mA× 12s)/(3s+12s)≈4.0 (mA)