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Startup
Before startup, the components required
for your application must be connected.
The SIM card must be inserted in a
deenergized state.
The modem is ready for operation when
supply voltage is applied and the ignition
line is activated. If the recommended
plug-in power supply unit is used, the
ignition line is already connected to the
supply voltage line, and the modem is
thus immediately switched to the active
state. It starts the network search and
registers with network operator. Please
read the following conditions for switching
the modem on and off:
Simply applying supply voltage (+ to pin 1
and GND to pin 6) alone is not enough to
switch on the modem.
It can be switched on in two different
ways:
Activation of the IGT_IN ignition signal
on the power supply connection
The switching regulator is switched on
with the IGT_IN = high signal. When the
switching regulator is switched on, VBAT is
generated as the operating voltage for the
GSM/GPRS module. This still does not
activate the GSM/GPRS module. Triggered
by VBAT, a transistor switch generates the
IGT ignition signal with a delay of approx.
100 ms for the GSM/GPRS module. Only
then is it switched on. (It exits the POWER
DOWN operating state.)
Switching
on modem
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