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204 lines
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<TITLE>The Answer Guy 32:
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High Speed Serial (RS422) under Linux
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Q : Linux Rs422 drivers
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<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
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<H1 align="center"><A NAME="answer">
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<img src="../gx/dennis/qbubble.gif" alt="" border="0" align="middle">
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<a href="./index.html">The Answer Guy</a>
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</A></H1>
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<BR>
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<H4 align="center">By James T. Dennis,
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<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a>
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<BR>Starshine Technical Services, <A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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</H4>
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<p><hr><p>
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<H3><img src="../gx/dennis/qbub.gif" alt="(?)"
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width="50" height="28" align="left" border="0"
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>High Speed Serial (RS422) under Linux</H3>
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<p><strong>From Sujeetharan Sivasubramaniyam on 18 Aug 1998 </strong></p>
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<strong><p>Hi I want to use RS422 card under linux. I am not sure whether this
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is suppored by linux already. Also I would like to see some
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documentation on this. Any pointers will be greatly appreciated!
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</p></strong>
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<strong><p>Thanks
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</p></strong>
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<blockquote>Since you don't mention <EM>which</EM> specific card you are
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hoping to use, I'll assume that you are willing to
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buy a new/supported card if necessary.
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</blockquote>
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<blockquote>Naturally, with any question about supported hardware,
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the first place to check is the Hardware-HOWTO
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(<A HREF="http://sunsite.unc.edu/LDP/HOWTO/Hardware-HOWTO.html"
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>http://sunsite.unc.edu/LDP/HOWTO/Hardware-HOWTO.html</A>).
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</blockquote>
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<blockquote>At first we might be led astray (searching on serial
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gets us to section 26.6: "Modems and Serial Cards"
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--- but that's in reference to PCMCIA cards). However,
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we don't find any references to 422 under "Controllers, I/O"
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and "Controllers, Multiport" nor anywhere else in the HOWTO.
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</blockquote>
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<blockquote>Running the Excite search on the LDP site using the string
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"<tt>422</tt>" doesn't net any useful results either.
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</blockquote>
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<blockquote>So, we have to dig a bit deeper. A Yahoo search using the
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string "<tt>+rs422 +linux</tt>" nets about 53 hits. The first
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of these is from NTLUG (North Texas Linux User's Group)
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which lists a company called Vikom, in Irving, TX with
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the note:
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</blockquote>
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<blockquote><dl><dt>"manufactures RS232 and RS422 multiport cards
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for Linux"
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<dd>(<A HREF="http://www.ntlug.org/lint/index.html"
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>http://www.ntlug.org/lint/index.html</A>).
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</dl>
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</blockquote>
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<blockquote>... No URL or contact information is provided.
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</blockquote>
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<blockquote>Another result of this Yahoo! search is for GTek Inc.
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(a long-time manufacturer of serial hardware for PC's).
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</blockquote>
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<blockquote>They list a Cyclone 6 and note that there are "RS422 and
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RS485 interfaces available" and separately they say:
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</blockquote>
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<blockquote><dl><dt>"Drivers are available for all popular operating
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systems: WindowsNT, Windows95, Linux, OS/2 and DOS."
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<dd><A HREF="http://www.gtek.com/news.html"
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>http://www.gtek.com/news.html</A>.
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</dl> </blockquote>
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<blockquote>(Granted, this second lead is buried under about a
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dozen unlikely results that I didn't follow).
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</blockquote>
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<blockquote>You might also search the Equinox, Digi, Specialix,
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and other web pages for manufacturers of specialized
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and multi-port serial hardware to see if they have
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something that suits your needs.
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</blockquote>
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<blockquote>Presumably there is some RS422 support built into the
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Kernel --- at least in the PPC (PowerPC) port. As far
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as I know most Mac's and Mac clones shipped with built-in
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RS-422 (a.k.a. EIA-422) ports for their modems (and
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printers?).
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</blockquote>
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<blockquote>I also found a note that seems to confirm my own experience
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--- that is is possible to interface RS-422 connectors to
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most RS-232 devices using the proper cabling (the classic
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"Mac to PC Modem" cable). There is even one message
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about using a special cable to connect an Apple printer
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to a PC's serial port. This suggests that some RS-422 devices
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can be interfaced to RS-232, as well. (I mention this since
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your requirements aren't clear from your message --- potentially
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you don't need an RS-422 interface at all).
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</blockquote>
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<blockquote>Obviously if you already have a specific device and
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you are interested in details about <em>that RS-422 card</em>
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you'll have to provide details about it. Since I don't
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have any first-hand experience with any RS-422 hardware on
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PC's and I've shown exactly how I did my searches, it would
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make sense to do your own searches for support on your
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card. If you can't find a manufacturers label or any
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docs on the card (i.e. you inherited it in "used" condition)
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then you're probably out of luck.
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</blockquote>
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<!-- end body -->
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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> 1998, James T. Dennis <BR>
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Published in <I>Linux Gazette</I> Issue 32 September 1998</H5>
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