From owner-freebsd-questions Wed Dec 11 7:40:34 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A6CD137B401 for ; Wed, 11 Dec 2002 07:40:33 -0800 (PST) Received: from mx01.forces.gc.ca (mx01.forces.gc.ca [131.137.245.201]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4960043ED1 for ; Wed, 11 Dec 2002 07:40:33 -0800 (PST) (envelope-from Deroy.B@forces.gc.ca) From: Deroy.B@forces.gc.ca To: questions@FreeBSD.org Subject: Date: Wed, 11 Dec 2002 10:40:21 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Message-Id: <20021211153947.C27B7412DB@mx01.forces.gc.ca> Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG hi, i have been reading about usb device for the past 2 weeks and i did not find what i wanted and wondered if you could give me a tip on how or where i could find the info. eia 232 (db 9) to usb because the mechanical spec is 4 wire for usb (1 ground, 1Vbus, D+ and D-) +/- 400mv between the two state and that eia 232 uses tx and rx (pin 2 and 3) i wounder how they manage to put the data on D+ and D- and then switch to Rx with the same two wire...(D+ D-) so just to make it clear... D+ D- is tx and rx at the same time so this is where i get lost. if you can clarify or help in any way thank you Bernard Deroy bderoy1@hotmail.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message