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Startup
In its energized state, the GSM/GPRS
module provides the supply voltage (VDD).
VDD ensures that the switching regulator
remains on, even when its closing
condition is lost (i.e. IGT_IN = low).
Explanation:
VBAT = operating voltage for the module
VDD = supply voltage from the module
Activation of the RS232 or USB control
line DTR
The modem can be switched on in the
same way as via IGT_IN by activating the
RS232 control line DTR (high signal).
Note
The modem is switched on immediately
using the recommended plug-in power
supply unit (see the above explanation on
startup).
The modem can be switched off in two
different ways:
Using a software command by means
of an AT command
A software shutdown via an AT command
is always advisable for a controlled
shutdown of the modem. In this case, the
GSM/GPRS module signs off before the
watchdog condition results in the specific
switching off of the supply voltages.
Switching off
/ resetting the
modem
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