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    SubjectRe: [patch] DTR/DSR hardware handshake support for 2.0/2.2/2.4
    Date
    Followup to:  <200008021351.JAA05979@trampoline.thunk.org>
    By author: "Theodore Ts'o" <tytso@mit.edu>
    In newsgroup: linux.dev.kernel
    >
    > Date: Tue, 01 Aug 2000 18:35:22 +0200
    > From: Martin Schenk <schenkm@ping.at>
    >
    > As I needed support for DTR/DSR hardware handshake to communicate with
    > a serial printer (and the "wire RTS/CTS to DTR/DSR" tip from the
    > serial-HOWTO works fine for a demo, but is not applicable for a few
    > thousand POS terminals *gg*), I implemented this functionality.
    >
    > Yilch. This is specialized enough that I'd much rather this *not* go
    > into the kernel. Next thing we know, someone will want a DTR/CD
    > handshaking mechanism, etc.,etc.
    >
    > This should probably be a private kernel patch, or (much more strongly
    > suggested) that you just get specially wired RS-232 cables. This is in
    > fact a very standard thing to do, and you can order cables from Black
    > Box or some other company specializing selling cables which connect
    > crufty legacy hardware.
    >

    DTR/DSR is the most common handshake mechanism for RS-232-B (as
    opposed to RS-232-C and RS-232-D) devices. This feature has been
    requested on and off for the last five years. I think it's
    worthwhile.

    -hpa

    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
    "Unix gives you enough rope to shoot yourself in the foot."
    http://www.zytor.com/~hpa/puzzle.txt

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