Date: Wed, 11 Dec 2002 10:40:21 -0500 From: Deroy.B@forces.gc.ca To: questions@FreeBSD.org Message-ID: <20021211153947.C27B7412DB@mx01.forces.gc.ca>
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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
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