Date: 25 May 1999 17:05:59 +0100 From: Terry Glanfield <terry@program-products.co.uk> To: Graeme Tait <graeme@echidna.com> Cc: freebsd-questions@freebsd.org Subject: Re: console terminal server and power loss Message-ID: <e7lpxt9qw.fsf@program-products.co.uk> In-Reply-To: Graeme Tait's message of "Tue, 25 May 1999 10:29:50 -0400" References: <9905251324.AA03380@program-products.co.uk> <374AB3DE.C07ABB41@echidna.com>
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Graeme Tait <graeme@echidna.com> writes:
> For RS-232C communication, "break" is signalled by a prolonged absence of high
> ("mark") on the transmitted data line - so you can detect a literal line break,
> or shorted line, etc., that would result in loss of ability to transmit. The
> Suns may also monitor and react to other control signals that are part of the
> serial interface.
Presumably different serial cards will behave differently when powered
down - some short circuiting and others open circuiting. Does anyone
know of a serial card that will leave an open circuit - preferably a
multi-port card?
Terry.
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