User guide

47
F Installing a Modem in a Linux PC
Appendix F: Installing a Modem in Linux
Introduction
This appendix explains how to install a modem on a PC operating under the RedHat
Linux 6.2 operating system. Other versions of RedHat and other Linux operating
systems should be similar. Briefly, in Linux, you do not need drivers for most
standard external modems and most internal ISA bus modems. Programs in Linux
commonly call upon the port, rather than the modem.
Standard Linux Serial Port Definitions
Port Linux Port
Com 1 ttyS0
Com 2 ttyS1
Com 3 ttyS2
Com 4 ttyS3
Installation
Connect the external modem to an available serial port.
Setup
This section describes how to make sure Linux can talk to the modem and be able to
dial up to the Internet.
Using the terminal program Minicom to verify operation
1. At the command prompt, type minicom –s and press ENTER.
2. Select Serial port setup and press ENTER.
3. From Serial port setup, use the A key to access Serial Device, and then press
ENTER.
4. Press ESC.
5. You are now in the Minicom terminal. Type AT and press ENTER. The screen
should display OK to verify the operation. Alternately, dial a phone number to
verify line operation
6. To leave Minicom, press CTRL + A, and then press Z.
7. On the help menu, press X to exit.