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-<!-- This is an SGML document in the linuxdoc DTD of the Tutorial for
- Configuring a FreeBSD for Dialup Services by Guy Helmer.
- $Id$
-
- The FreeBSD Documentation Project
-
-<!DOCTYPE linuxdoc PUBLIC "-//FreeBSD//DTD linuxdoc//EN">
-
-<linuxdoc>
- <article>
- <title> Serial Basics
- <author> FAQ
- <date> 24 Nov 1996, (c) 1996
-
- <abstract> This section outlines some of the basics to get your serial ports working. This is really just a stepping stone into the section on PPP or Dialout if you are interested in modems.
- </abstract>
-
- <toc>
--->
-
-<sect><heading>Serial Basics<label id="serial"></heading>
-
-<p><em>Assembled from FAQ.</em>
-
-This section should give you some general information about serial ports. If you do not find what you want here, check into the Terminal and Dialup sections of the handbook.
-
-
- <p>
- The <tt/ttydX/ (or <tt/cuaaX/) device is the regular device
- you will want to open for your applications. When a process opens
- the device, it will have a default set of terminal I/O settings.
- You can see these settings with the command
- <verb>
- stty -a -f /dev/ttyd1
- </verb>
-
- When you change the settings to this device, the settings are in
- effect until the device is closed. When it is reopened, it goes
- back to the default set. To make changes to the default set, you
- can open and adjust the settings of the ``initial state'' device.
- For example, to turn on <tt/CLOCAL/ mode, 8 bits, and
- <tt>XON/XOFF</tt> flow control by default for ttyd5, do:
- <verb>
- stty -f /dev/ttyid5 clocal cs8 ixon ixoff
- </verb>
-
- A good place to do this is in <tt>/etc/rc.serial</tt>. Now, an
- application will have these settings by default when it opens
- <tt/ttyd5/. It can still change these settings to its liking,
- though.
-
- You can also prevent certain settings from being changed by an
- application by making adjustments to the ``lock state'' device.
- For example, to lock the speed of <tt/ttyd5/ to 57600 bps, do
- <verb>
- stty -f /dev/ttyld5 57600
- </verb>
-
- Now, an application that opens <tt/ttyd5/ and tries to change the
- speed of the port will be stuck with 57600 bps.
-
- Naturally, you should make the initial state and lock state
- devices writable only by <tt/root/. The <tt/MAKEDEV/ script does
- <bf/NOT/ do this when it creates the device entries.
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