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

Carlos Alberto Cortez calberto.cortez at gmail.com
Thu Jan 18 14:47:59 EST 2007


Could you cook a test case? That way we can try to take a look at the


> 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
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