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4.3.1.2
Switching From Data Mode to Command Mode
To switch the connection from Data mode to Command mode, send the Escape Sequence command (+++).
If the modem responds with "OK" to the Escape command, the modem is in Command mode and the dial connection is still
active, and you can use the AT command set.
The character '+' in the Escape Sequence pattern can be changed using the S-register.
Note
4.3.1.3
Hanging Up
If you are using a communications program, use the "Hang up" or "Disconnect" AT command in the program to disconnect the
call.
When using computers in the "Dumb Terminal mode", return to the Command mode by typing the Escape Sequence, +++, and
then hang up by typing the Hang up command as follows:
ATH <Enter>
If the g20 responds with "OK", the dial connection is closed.
4.3.1.4
Dialing to an Electronic Telephone Service
When you dial to an electronic telephone service such as telephone banking, you must typically instruct the modem to dial a
number, then to wait for call establishment, and then send the password for entering the banking account. A typical command
line might look like this:
ATD876-5555,123456; <Enter>
The modem dials the number, then pauses to wait for the call connection (the comma in the command line causes the pause).
By default, the comma causes a two-second pause. However, you can create a longer or shorter pause by changing the value for
register S8.
You can also create a longer pause by including several commas in a row in the command line, and then send the password to
the service.
4.3.2
Receiving a Data Call
ATA <Enter>
This command instructs the modem to be the "answering modem". Either party may be the answering or the originating modem,
but both parties cannot be the same modem at the same time.
Both parties should ensure that their telephone handsets are hung up. If not, data errors may occur. You hear the modem
handshake and see the result code "CONNECT" along with the connection speed.
98-08901C68-O
AT Commands Reference
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