How do I send AT commands to my modem?

Most modems support the AT command set.  Think of the command set as a special language that modems understand.  An example is ATZ, the command that resets the modem.  The modem's user manual usually includes a list of the AT commands that the modem supports. 

There are a couple of ways for you to send AT commands to a modem in Windows CE.   One way is to use the Device Properties dialog box of a Remote Networking connection.  The Call Options tab of the Device Properties dialog box has an Extra Settings field where you can add AT commands that will be inserted into the dial string.   The screen shot below shows you where this field is located.

To add commands to the Extra Settings field of an existing connection do the following:

1. Select the connection and tap File | Properties
2. Tap Configure
3. Tap the Call Options tab
4. Place the cursor in the Extra Settings field and enter the commands
5. Tap OK
6. Tap OK to close the Dial-Up Connection dialog box

In some cases you may want to open a terminal window and enter AT commands direction directly to the modem.  The simplest way to do this is to create a new remote networking connection that brings up a terminal window before dialing a phone number.   To make such a connection following these instructions:

1. Tap Start | Programs | Communication | Remote Networking
2. Tap Make a New Connection
3. Give the connection a name, select dial-up connection and tap Next.
4. Select a modem
5. Tap Configure
6. Check "Use terminal window before dialing" in the Port Settings Tab of the Device Properties dialog box.
7. Tap OK
8. Tap Next
9. Enter a phone number.  It can be anything, it won't be dialed.
10. Tap Finish

To use the connection double-tap its icon.  Tap connect.  A terminal window will open in which you can type AT commands.  Once you are done tap the close button.   If you tap the OK button the modem will dial the phone number that you entered in step 9 above.

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