From owner-freebsd-questions Tue May 25 9: 6:25 1999 Delivered-To: freebsd-questions@freebsd.org Received: from mailgate.program-products.co.uk (samson.program-products.co.uk [212.240.242.226]) by hub.freebsd.org (Postfix) with ESMTP id 2ADA4152C9 for ; Tue, 25 May 1999 09:06:16 -0700 (PDT) (envelope-from terry@program-products.co.uk) Received: by mailgate.program-products.co.uk via smap (V2.1) id xma045925; Tue, 25 May 99 17:06:02 +0100 To: Graeme Tait Cc: freebsd-questions@freebsd.org Subject: Re: console terminal server and power loss References: <9905251324.AA03380@program-products.co.uk> <374AB3DE.C07ABB41@echidna.com> From: Terry Glanfield Date: 25 May 1999 17:05:59 +0100 In-Reply-To: Graeme Tait's message of "Tue, 25 May 1999 10:29:50 -0400" Message-Id: Lines: 14 X-Mailer: Gnus v5.6.44/Emacs 19.34 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Graeme Tait 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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message