Re: Serial port read working but not write.

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Fri, 2004-07-23 14:12:49 +0200, Salomon, Frank <frank.salomon@wincor-nixdorf.com>
wrote in message <410100C1.5030404@wincor-nixdorf.com>:
> Jan-Benedict Glaw wrote:
> >On Fri, 2004-07-23 11:30:11 +0200, Salomon, Frank 
> ><frank.salomon@wincor-nixdorf.com>
> >wrote in message <4100DAA3.7060205@wincor-nixdorf.com>:
> >>the problem is you need a procedure which find out what the problem is.
> >>Hardware check:
> >>Your hole hardware you can divided in:
> >>- PC - com port
> >>- cable
> >>- external Hardware
[...]
> >This doesn't need to work, depending on handshake settings. Also, (at
> >least in theory), you can have different sending and receiving speeds...
> >
> >man stty

> it there any linux OS on which that test does not work after reboot ?

The point is like this: something in your serial settings *is* already
broken, so the last thing you want is to *rely* on the serial port's
config state. With a good chance (especially in this case), exactly this
is what is wrong.

I hope you don't do C programming with depending on undefined
behavior...

MfG, JBG
PS: Please trim messages properly...

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