Chapter 3 – Using Your Wireless Modem
Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide
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3.
To initiate an emergency call:
a.
Type
ATD112;
(Note:
Don’t forget the semicolon “;” at the end, which indicates voice calls)
b.
Responses include:
OK
4.
To hang up:
a.
Type
ATH
b.
Responses include:
OK
Establishing a Circuit-Switched Data (CSD) Connection
A Circuit-Switched Data Connection makes the wireless modem work similar to a regular analog
modem. You must have CSD service in order to make a CSD call.
Note:
Your wireless service provider charges airtime usage for these connections.
Establishing a Connection
1.
Use HyperTerminal or a terminal application, type the following command:
ATD<phone number>
Notes:
●
The phone number you are calling is entered between the displayed brackets. Do not type
additional brackets. For example, type only
ATD 8585551212
.
8285551212
is typed between the
brackets.
●
This command tells the modem to inform the wireless network that you are initiating a CSD
modem call. If you are dialing to another modem, the remote modem should answer and a
connection between the two modems will be established. If you include a semi-colon (;) at the
end of the dialing string, the modem will instead initiate a Voice call to the phone number
dialed.
Disconnecting
1.
To disconnect,
t
ype:
+++
2.
Wait about two seconds to see an OK response.
3.
Then type:
ATH
Note:
+++
is the escape sequence and
ATH
is the Hang-up command.
Answering a Circuit-Switched Data (CSD) Connection
A Circuit-Switched Data Connection makes the wireless modem work similar to a regular analog
modem. You must have CSD service in order to answer a CSD call.
There are three phone numbers for GSM: the voice number, the data number, and the fax number. All
are provided by the carrier.
To answer a call:
1.
To establish a connection, call into the modem by dialing the data number provided by your carrier.
2.
To answer a call, when you see the RING responses on the terminal screen, enter
ATA <cr>
.
3.
To set auto-answer, enter
ATS0=x
