Date: Fri, 28 Jan 2005 04:43:03 -0800 From: "Loren M. Lang" <lorenl@alzatex.com> To: Florian Hengstberger <e0025265@student.tuwien.ac.at> Cc: FreeBSD mailinglist <freebsd-questions@freebsd.org> Subject: Re: simple serial loopback Message-ID: <20050128124303.GE8442@alzatex.com> In-Reply-To: <iayx14.248s9e@webmail.tuwien.ac.at> References: <iayx14.248s9e@webmail.tuwien.ac.at>
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On Thu, Jan 27, 2005 at 10:00:40AM +0100, Florian Hengstberger wrote: > Hi list! > I'm currently trying to setup my box for simple data transfer > to a microcontroller via the serial interface. > Therefore I've wired a nullmodem cable and as a first test > I was trying to connect from cuaa0 to cuaa1 simply by Generally you shouldn't need a null modem for a microcontroller, just a regular cable. That's because it's expected to be a slave to a PC, I think the technical term is "Data Set," which is just like a regular modem is a "Data Set," where a PC is a master or "Data Terminal." So PC to PC you need a null modem since it's "Data Terminal" to "Data Terminal." For monitoring my tty I find minicom or "cu -l /dev/cuaa0" to work just fine. > > xterm1: cat /dev/cuaa0 > > xterm2: echo "Something" > /dev/cuaa1 > > Unfortunatly cat exits with 0 after the first echo although it > displays the message correct, > so I have to "cat /dev/cuaa0" everytime I send something. > Why is this? > > Is there a better way to keep track of the ascii-chars sent > over a serial connection? > Kermit and minicom seem to be some sort of monster for > real serial connection (initialisation ...) which is a bit to much > for me. > In the end I just wan't to see the chars sent over the cabel > and wan't to reply to them by typing on the keyboard, that's it! > > Thanks in advance > Florian > > PS: Maybe a simple shell/perl script can help, should I focus on that? > > > ------------------------------------------------------ > Linux/BSD: The daemons are not longer just in my head! > ------------------------------------------------------ > Florian Hengstberger > e0025265@student.tuwien.ac.at > http://stud3.tuwien.ac.at/~e0025265 > ------------------------------------------------------ > > > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- I sense much NT in you. NT leads to Bluescreen. Bluescreen leads to downtime. Downtime leads to suffering. NT is the path to the darkside. Powerful Unix is. Public Key: ftp://ftp.tallye.com/pub/lorenl_pubkey.asc Fingerprint: B3B9 D669 69C9 09EC 1BCD 835A FAF3 7A46 E4A3 280C
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