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Operating states / LED
Once the operating voltage is applied (+
and GND), the modem is in the POWER
DOWN state.
The operating voltage for the GSM/GPRS
module is disconnected (the switching
regulator is off). In other words, the
software of the GSM module is not active.
A transition to the POWER DOWN
state always occurs in the following
circumstances:
When the modem (module) is shut •
down by means of AT commands (e.g.
sleep mode).
When the external reset line is active.•
POWER DOWN
Note:
Usually, the network search takes only a
few seconds till the modem is registered.
If the flashing continues, this means that
no SIM card is inserted, no PIN number is
entered or no GSM network is available.
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