Chapter 3 – Using Your Wireless Modem
Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide
37
Establishing a Voice Call
•
Enter PIN Code (if required by your wireless provider)
Type
AT+CPIN=1234
Responses:
OK (PIN Code accepted)
+CME ERROR : 16 (Incorrect PIN Code)
+CME ERROR : 3 (PIN already entered [with +CMEE : 1 mode])
•
Initiate a voice call
Type
ATD1234;
(Note:
Don’t forget the semicolon “;” at the end. This stands for
voice
calls)
Responses:
OK (Communication established)
CME ERROR : 11 (PIN Code not entered [with +CMEE : 1 mode])
CME ERROR : 3 (Operation not allowed)
•
Initiate an emergency call
Type
ATD112;
(Note:
Don’t forget the semicolon “;” at the end. This stands for
voice
calls)
Responses: OK
•
Hang up
Type
ATH
Responses: OK
Establishing a Circuit-Switched Data (CSD) Connection
A Circuit-Switched Data Connection (CDC) makes the wireless modem work similar to a regular analog modem.
You must have CSD service in order to make a CSD call. Note that your wireless provider charges airtime usage
for these connections.
Note:
Your cellular provider charges airtime usage for these connections.
Establish a Connection:
Using HyperTerminal or a terminal application, you can establish a CSD
connection by entering 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.
Disconnect:
Type:
+++
Wait about two seconds to see an OK response.
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:
Establish A Connection:
Call into the modem by dialing the data number provided by your carrier.
Answer a Call:
When you see the RING responses on the terminal screen, enter
ATA <cr>
to
answer the call.
Set Auto-Answer:
Enter
ATS0=
x
This sets the modem to auto-answer. The call will be answered after the number
of rings entered.
x
stand for the number rings.
Then call into the number provided to you by the carrier.
Disconnect:
Type:
+++
Wait about one second to see an OK response.
Then
type:
ATH