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Locating Your Modem with Linux
Linux uses device files to communicate with peripherals. Device files occupy the /dev directory and are somewhat equivalent to Windows drivers: You need them so that your hardware works.Your modem can connect to one of four serial ports available on your PC. A serial port is the mechanism your computer uses to communicate with a device, such as a modem. An external modem is generally connected to port /dev/ttyS0 or /dev/ttyS1, although configuring it as /dev/ttyS2 or /dev/ttyS3 is possible. If you have an internal modem, it can be any one of the tty devices.During the boot process, Red Hat Linux provides the kudzu utility, which automatically tries to locate new devices on your system. The kudzu utility is good at detecting equipment like modems (both internal and external). When kudzu detects a new device, it prompts you to configure the device, and you should let it do so.If the Linux hardware detection system kudzu cannot find your modem during the boot process, you have to do so manually. One manual method is the process of elimination; it’s crude, but effective. The following two numbered lists describe how to find your modem. The first method, for an external modem, involves sending a string of characters to the modem and watching for the light-emitting diodes (LEDs) to light up. The second method is for internal modems, which don’t have LEDs, so you have to use the hideous screeching sound of your modem to track it down.To use kudzu to find an external modem, follow these steps:Open a terminal emulator window by the clicking GNOME Menu button and choosing System ToolsTerminal.
Run this command from a command prompt in the terminal:
echo "anything" > /dev/ttyS0
Honestly, it doesn’t matter what you put between the quotation marks in the preceding commands. It just has to be some text — any text.If your modem is connected to the target serial port, you see the send-receive LEDs (sometimes marked as RX/TX) light up in a short burst.
In the unlikely situation that your modem isn’t found, try sending the string to /dev/ttyS1, /dev/ttyS2 and, finally, to /dev/ttyS3 by altering the number at the end of the command in Step 1 to match the port you’re targeting.
Life is a bit harder if you have an internal modem because you don’t have a visual response. You can, however, listen to the modem’s speaker to find out what’s going on. Follow these steps:
Open a terminal emulator window by clicking the GNOME Menu button and choosing System ToolsTerminal.
Enter this command at a command prompt:
echo "atdt5555309" > /dev/ttyS0
Tip If you hear the modem pick up and dial, you have won the game of hide-and-seek and know which device the modem is connected to. You can then skip to Step 4.
If you don’t hear anything, make sure that you have the speaker turned on by entering the following command and then retry Step 1:
echo "atv" > /dev/ttyS0
If you hear the modem pick up and dial, skip to Step 4.
If you still can’t hear anything, try using the other serial ports by trying again, substituting ttyS1, ttyS2, and ttyS3 in the command.
After your modem is found, send this command to the modem to kill the connection:
echo "atz" > /dev/ttyS0
