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The USB LED serves as an indicator of a USB cable connection between the PC and the
module. This link has two functions. First, it is the link used for transmission of
configuration data, and second, it is a medium for powering the module during
configuration process. Such solution ensures that even the long process of establishing
the correct parameters of the MT-703 module does not require the energy from
batteries.
7.2. Unlocking the SIM card
As it is generally known, three attempts of entering a wrong PIN number make a SIM
card locked, and unlock operation requires the knowledge of a PUK number. To avoid
such situation, the module checks the number of faulty attempts written in a card,
allowing only for two such attempts and disabling the third one even with the correct
PIN number. Two faulty attempts are indicated
by the GSM LED, and require a
correction procedure from the user to enable future login. The unlock operation may be
executed only if you know the valid PIN number.
To unlock the SIM card, you should:
switch off the module power
remove the SIM card from the module
insert the SIM card into an ordinary mobile phone which accepts cards issued by
the same operator
switch on the phone and enter the valid PIN number
if it has not been done before...
- run the module
- enter the valid PIN number into the module configuration
- switch off the module power
remove the SIM card from the phone and reinsert it in the module
run the module
The above described procedures will reset the counter of faulty attempts stored in the
SIM card and will enable the access to the card from the MT-703 module.
An additional possibility of SIM card unlocking is provided by connecting the module to
the PC and use a terminal emulation program (for example Hyperterminal). You must
have some PC knowledge to use this procedure.
In this case, after having a properly configured and running Hyperterminal program,
you should push the ACTIVATE button and then, during initial 15 seconds, send from
Hyperterminal the following command:
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