If you’re running a Windows 9x, Windows Me, Windows NT, or Windows 2000 computer, you can see which port your modem is connected to by following these steps:
Send e-mail to Bill Gates and ask him for your configuration.
If he’s tied up in court or is otherwise too busy to respond, see Step 2.
Choose StartSettingsControl Panel.
The Control Panel window appears.
Double-click the Modem icon or the Phone and Modem Control icon in Windows NT or the Phone and Modem Options icon in Windows 2000 systems.
When the Phone and Modems Options window opens, click the Modem tab. Select your modem from the list that appears.
Click Properties.
The Modems Properties dialog box appears.
Select the Diagnostics tab.
You see your modem listed with a COM line number beside it. That’s the Windows designation for your modem’s serial communications line. If the number 1 appears, it means that Windows knows it as COM1; if the number is a 2, it’s on COM2; and so on. These number designations translate directly to the matching number of ttyS0, ttyS1, ttyS2, and ttyS3 in Red Hat Linux.
If you’re running Windows XP, follow these steps to see which port your modem is connected to instead:
Click the Start button and then click the Control Panel icon.
The Control Panel appears.
Double-click the System icon.
The System Properties window appears.
Select the Hardware tab and click the Device Manager button.
The Device Manager appears.
Click the little plus sign next to the Modems menu item.
Your modem should be listed under the Modems menu item.