Doc. Title
ST3940 User Manual
Concerning:
Rev.
Date (dd-mm-yy)
Page of Pages
Features and how to configure ST3940
1.06
0
18-6-19
15 of 54
Charging
Mode
Turn On
As soon as a device in a status of power off is connected with a charger, only charging the
device starts being processed. But, GSM/UMTS session does not work.
When charger is connected, middle LED is continuously lighted on with RED color during 15
seconds around. This means that device enters offline-charging mode. After charging mode
detected, GPS LED is on, and after battery indicator continuously blinks.
Any button is not operated in the middle of detection of charging mode (around 15 seconds)
If you press ‘power button ’of the device for more than 3 seconds in a mode of charging, the
device will turn to be in a mode of normal operation.
Device might be in an operational mode using its built-in battery. While this device is being
charged and if you press the ‘power button’ of this device for more than 3 seconds, the mode
of the device will change to a charging mode.
Red LED
GPS/UMTS status indicator
Right after the power-on procedure is completed, all LEDs will be turned off automatically for
saving battery. If you press the power button shortly, all LEDs will be blinking for notifying current
status during a few seconds.
Number of blinking indicates following state :
Fixed : 1 time
No fixed: 2 times.
GPS error: 4 times.
