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4.4
Terminal mode operation
To operate the device the PIN (PIN = Personnel Identification Number) of the
inserted SIM card must be known. In the Terminal Mode the PIN is not stored in
the MODEM MD720. The PIN must be set again every time the device is turned-
on.
●
The PIN is set by AT commands.
If you use a PIN-less SIM card the PIN request is skipped.
Control by the application
Usually the application or the application software, which you execute on a
connected computer, will control the MODEM MD720. So wits, the commands to
establish or to disconnect a data connection via the GSM network, are given by the
application to the device. For this purpose the application and the device
communicates using AT commands, like other types of modems. The sending of
SMS is handled in the same way.
Direct control using AT command
You can also enter manually AT commands to control the MODEM MD720. In this
case use any terminal program (Refer to Working with a terminal program.)
Or you write your own communication program which is adapted especially to your
purposes.
Enter the PIN first
Please enter the PIN first before any other AT commands. Until a PIN has been
entered most AT commands will be answered with ERROR.
Fehler! Verweisquelle konnte nicht gefunden werden.
MODEM MD720 in Terminal Mode
21
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