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133 lines
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<TITLE>The Answer Guy 43: Null Modems: Connecting MS-DOS to Linux as a Serial Terminal</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
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<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
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LinuxCare,
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<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>Null Modems: Connecting MS-DOS to Linux as a Serial Terminal</H3>
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<p><strong>From phax on Mon, 31 May 1999
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</strong></p>
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<!-- ::
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Null Modems: Connecting MS-DOS to Linux as a Serial Terminal
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:: -->
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<P><STRONG>
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Would the terminal program start the null modem connection or
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would you have to have it be connected before hand through DOS
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(I don't know a whole lot about DOS)? I know Linux will be
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looking for a terminal on <tt>ttyS0</tt> but will a terminal emulator
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show up as a terminal connected on that port?
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Sorry to be such a nag,
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</STRONG></P>
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<P><STRONG>
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Richard Mills
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Linux will look for terminal connections on
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a line (<TT>/dev/ttyS0</TT>, <TT>/dev/ttyS1</TT>, whatever) if it
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it has a "<tt>getty</tt>" process running on that port.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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You set up a getty process by modifying your <TT>/etc/inittab</TT>
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and adding a line like:
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</BLOCKQUOTE>
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<blockquote><pre>d1:23:respawn:/sbin/agetty -L 38400,19200,9600,2400,1200 ttyS1 vt100
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</pre></blockquote>
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<BLOCKQUOTE>
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... where you can use <tt>agetty</tt>, <tt>uugetty</tt>, <tt>mgetty</tt>, or
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<tt>getty_ps</tt> (but not <tt>mingetty</tt>). The syntax and additional
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configuration of each of these other getty packages differs slightly.
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Search through old issues of the Answer Guy for more
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detailed explanations and examples.
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</BLOCKQUOTE>
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<BLOCKQUOTE><em>[ Issues 16, 17, 18, 21, 22, and 23 mention getty, and more
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recently, issues 34 and 37 describe using X over serial lines.
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-- Heather ]
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</em></BLOCKQUOTE>
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<BLOCKQUOTE>
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As far as the DOS side of this, you generally just have to
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start up your terminal emulation package and configure it
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for "direct" or "null-modem" use.
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</BLOCKQUOTE>
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<P> <hr> <P>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 1999, James T. Dennis
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<BR>Published in <I>The Linux Gazette</I> Issue 43 July 1999</H5>
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<H6 ALIGN="center">HTML transformation by
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<A HREF="mailto:star@starshine.org">Heather Stern</a> of
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Starshine Techinical Services,
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<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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</H6>
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