Chapter 3 – Using Your Wireless Modem
Establishing a Circuit-Switched Data (CSD) Connection
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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 |
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| brackets. Do not type additional brackets. For example, type only ATD |
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| 8585551212. 8285551212 is typed between the brackets. |
| • | This command tells the modem to inform the wireless network that you are |
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| initiating a CSD modem call. If you are dialing to another modem, the |
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| remote modem should answer and a connection between the two modems |
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| will be established. If you include a |
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| string, the modem will instead initiate a Voice call to the phone number |
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| dialed. |
Disconnect: | Type: +++ | |
| Wait about two seconds to see an OK response. | |
| Then type: ATH | |
| Note: +++ is the escape sequence and ATH is the | |
Answering a Circuit-Switched Data (CSD) Connection
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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 | Enter ATS0=x |
| This sets the modem to |
| 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 |
Using Short Message Services (SMS)
Send a Short Message to a Specified Number.
Type AT+CMGS="8585551212" <press Enter>
Then type your message: Please call me soon. <press ctrl Z>
The modem may respond with +CMGS:<mr> OK
Write a Message to Memory.
You can store a message to send it at a later date. Type AT+CMGW="8585551212" <press Enter> Type the message. <press ctrl Z>
The modem may respond with +CMGW: 4 OK (The message is stored in the index as message 4.)
Send a Message from Storage.
Type AT+CMSS=x,"8585551212" <press Enter>
The modem may respond with +CMSS: 1 OK (The transmission is successful. One SMS message is sent.)
Note: The x represents an index location.
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