| documentation or call your computer’s manufacturer |
| to get instructions on how to disable the |
| modem. |
Problem: | The software cannot find the modem and the |
| modem does not respond to AT commands. |
| (The following comment applies to many other |
| problems as well.) |
Solution: | The most common problem with modems is that the |
| communications software is not configured for the |
| same COM port as the modem. |
| Check which COM port the modem is using. Make |
| sure that the software’s COM port setting matches |
| the modem’s COM port setting. From the Windows |
| Toolbar, go to Start Settings Control Panel |
| Modems Diagnostics. Click the COM port for |
| your modem, then click More info. If Windows |
| displays the modem’s ATI responses, the modem is |
| working. |
| Another problem is that COM port resources may be |
| in use by another device. Make sure that the COM |
| port resources used by the modem are not being |
| used by any other device, such as a soundcard. |
Problem: | You type an AT command line in a terminal |
| application and press Enter, but your modem |
| fails to execute the command line. Or there was |
| no response after executing a command. |
Solution: | Be sure you type AT at the beginning of the |
| command line. |
| Make sure the communications software is |
| configured for the same COM port as your modem. |
| Be sure your modem is not in data mode when you |
| type the command. Use the escape character |
| sequence to switch to terminal mode (The default |
| escape sequence is to wait at least one second, |
| type +++, and wait another second or more.) |
|
|
| 23 |