[Mono-dev] [Mono-list] serial port problem

[Leszek Ciesielski]

On 1/19/07, Mario Munda <mario.munda at globtel.si> wrote:
> Hi
>
> The example from the HowToSystemIOPorts
> (http://www.mono-project.com/HowToSystemIOPorts) doesn't work, for
> starters...
>
> Transmiting part works ok, but not the receiving.
>
> P.S.:
> I use FreeBSD, and I'm sending data to /dev/cuad0.
>
> Best Regards
>
> Carlos Alberto Cortez pravi:
> > Hey,
> >
> > Could you cook a test case? That way we can try to take a look at the
> > issue.
> >
> > Carlos.
> >
> >
> >> First, I can succesfully read a text string, when I "loopback" a
> >> serial cable, connecting pins 2 and 3.... I send the string and can
> >> read it immediatly, it worked fine for me in Linux (running mono as
> >> root, my mono version is 1.2.2). The code I used is the same found in
> >> http://www.mono-project.com/HowToSystemIOPorts
> >>
> >> But I cannot succeed in another mono application, where I try to
> >> communicate to an external device using modbus (binary protocol). The
> >> device correctly understands my query, and I know it responds (because
> >> a "TX" led blinks in the device), but mono can't get any data from the
> >> port. Depending on mono version, and whether I'm root or not, I can
> >> get two types of error... sometimes a "timeout" exception is raised,
> >> and sometimes i get a byte with a "255" value.
> >>
> >> I tryed other (non-mono) applications to communicate to the same
> >> external device, and they work ok in Linux, and also in Windows.
> >>
> >> I'm still debugging, but maybe there is something with DTR signals,
> >> etc., or maybe a bug with binary communications.
> >>
> >> i'll keep trying and will post if I find a solution....
> >>
> >> if anyone got binary communications working OK, please inform what was
> >> the os distributon/ monon version used...eventually i could change my
> >> system set-up, if that fixed the problem....
> >>
> >> thanks, Victor
> >> _______________________________________________
> >> Mono-devel-list mailing list
> >> Mono-devel-list at lists.ximian.com
> >> http://lists.ximian.com/mailman/listinfo/mono-devel-list
> >>
> >
> >
> >
>

Hi,

I have to take back what I said earlier about SerialPort working
without problems. The binary helper has a small mistake that causes it
to throw TimeoutException prematurely when EINTR is issued. I have
updated the bug (http://bugzilla.ximian.com/show_bug.cgi?id=79073) and
provided a patch. Could the maintainer inspect the patch and commit
it?

Regards,

Leszek [skolima] Ciesielski

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