Re: [patch] DTR/DSR hardware handshake support for 2.0/2.2/2.4

From: Theodore Ts'o (
Date: Wed Aug 02 2000 - 08:51:54 EST

   Date: Tue, 01 Aug 2000 18:35:22 +0200
   From: Martin Schenk <>

   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.

                                                - Ted

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