Siemens SINAUT MD720-3 System Manual page 27

The LED S (status) blinks fast
If the modem blinks fast (4 times each second), either the SIM card was not
detected correctly or the SIM card is PUK-blocked, because a wrong PIN has been
entered too often.
Please check, if the SIM card is inserted correctly (see chapter 2 Inserting the SIM
card).
Please check, if the SIM card is PUK-blocked. Insert the SIM card into a common
mobile phone. The mobile phone will display, if the SIM card is PUK-blocked. If the
SIM card is PUK-blocked, please enter the PUK and then a PIN. You can use a
common mobile phone to do this.
Before you enter again the SIM card into the SINAUT MD720-3, please investigate
why the SIM card has been PUK-blocked: Which PIN have you entered or which
PIN has your application sent to the SINAUT MD720-3?
Changing the SIM card
If you change the SIM card, please do not forget to update also the PIN number in
your application.
If you use a lot of SIM cards it can be helpful to set all PINs to the same PIN
number. You can do this i.e. by using a mobile phone. Please observe the security
requirements of your organization.
PIN-less SIM cards
The device operates also with SIM cards, which PIN check is deactivated. In this
case the PIN check is skipped and the device will immediately try to attach the
GSM network.
SINAUT MD720-3
C79000-G8976-C211
SINAUT MD720-3 in Terminal Mode
27