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2.6
Registration process of the modem MD720-3
The modem automatically logs onto the provider's GSM network, provided the
PIN number of the inserted SIM card was validated. The table below shows this
process on the basis of the diagnostic LEDs on the modem.
Table 2-5
1.
2.
3.
4.
The modem has to be in command phase for SMS operation (accepts AT
Note
commands). If this is not the case (e.g. due to modem in GPRS operation), the
modem has to be reset to factory settings first.
Sending and Receiving SMS Messages with MD720-3
Entry ID: 25545680,
V1.0,
No.
After applying the power supply
voltage, the S and C LEDs will
each flash cyclically every
second or once every two
seconds.
After initialization has been
triggered, the modem performs
a parameter check.
LED S flashes cyclically once
every second.
The modem tries to establish a
GSM connection.
LED Q flashes cyclically once
every second.
LED lights up continuously.
The modem successfully logs
into the provider's GSM
network.
12/2013
Operation
1s
S
1s
S
S
S
Screenshot
2s
C
Q
Q
C
1s
C
Q
C
Q
17
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