User's Manual

GWM300 Hardware Interface Overview
3.6 SIM Interface
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 GWM300_HIO_v01 2016-01-26
Confidential / Released
Page 25 of 35
3.6 SIM Interface
The SIM interface is intended for 1.8V and 3V SIM cards in accordance with GSM 11.12 Phase 2.
The card holder is a five wire interface according to GSM 11.11. The SIM card holder is pro-
tected by a rubber cover that has to be opened before a SIM can be inserted.
Figure 5: SIM interface
The SIM - with the circuit side facing upwards - is inserted by gently pushing it into the SIM card
holder until it snaps hold. It is now protected from accidental removal. The SIM can be removed
from the card holder by using a flat object such as a screwdriver to carefully press the inserted
SIM until it snaps out again.
All signals of the SIM interface are protected from electrostatic discharge.
Removing and inserting the SIM card during operation requires is not supported by GWM300.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered after
removing the SIM card during operation. Also, no guarantee can be given for properly initializ-
ing any SIM card that the user inserts after having removed a SIM card during operation. In this
case, the application must restart the GWM300.
3.7 Status LED
GWM300 has a green LED to indicate its operating status.
Figure 6: Status LED
The LED is enabled by default, but can be configured by AT command AT^SLED. For more
information on the AT^SLED command please refer to [1].
SIM card reader
Status LED