Operating states / led – Siemens TC35 User Manual

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Operating states / LED

Note:
Usually, the network search takes only a
fewseconds till the Terminal 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.

POWER DOWN

Once the operating voltage is applied (+ and
GND), the TC35 Terminal is in the POWER
DOWN state.

The operating voltage for the GSM 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 Terminal (module) is shut down

by means of AT commands (e.g. sleep
mode).

• When the external reset line is active.