Date: Tue, 27 Aug 1996 12:37:27 -0600 From: Steve Passe <smp@csn.net> To: questions@freefall.freebsd.org Cc: Gary Chrysler <tcg@ime.net>, "Francis Percival C. Favoreal" <june@adn.edu.ph> Subject: Re: questions-digest V1 #1275 Message-ID: <199608271837.MAA28349@clem.systemsix.com> In-Reply-To: Your message of "Tue, 27 Aug 1996 07:32:17 PDT." <199608271432.HAA08015@freefall.freebsd.org>
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Hi, >> > board DOES NOT have full flow-control. Specifically it only >> > provides CTS/RTS. There is no DTR/DSR or Data Carrier Detect. >> ... >They will still respond to: ca -l cuaa4/11 if working. Speaking on a theoretical level, I agree that cuaXX devices should not block on open for lack of carrier (DCD, -clocal) however, could not flow control, ie CTR/RTS still prevent the modem from sending chars back to the computer? In this case its not the problem as Francis has already tried (and failed with) my suggested experiment. The basic problem with this board is that BOCA uses a RJ11 cable that provides 6 wires. They chose to use: 1: CTS 2: signal ground 3: Rx 4: Tx 5: frame ground 6: RTS Frame ground and signal ground are redundant. If the combo chip provides a DCD pin one could do a simple hack with a rs232/ttl level converter chip to replace the frame ground lines with DCD inputs. I think you could live without DTR, either by strapping it in the connector, or with some modems, setting their "DTR always on" switch. All you would loose is programatic reset/data mode breakouts. Does anyone know the part # for the combo UART chips used on the BOCA 8? My board is in a machine that I can't easily get to at the moment. I'm thinking out loud here, feel free to point out errors... -- Steve Passe | powered by smp@csn.net | FreeBSD
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