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Re: Serial port using USB adaptor

On 2/29/08, Corinna Vinschen <> wrote:
> On Feb 29 22:20, hce wrote:
>  > On 2/29/08, Corinna Vinschen <> wrote:
> > > /dev/ttyUSB0 works?!?  It's no device name recognized by Cygwin, so
>  > >  I assume you created a file on the disk called /dev/ttyUSB0 when
>  > >  using it.
>  >
>  > It was copied from Linux.
> Yeah, I assumed that much.  As I said, that's not a device name
>  Cygwin can do anything useful with.
>  > >  My knowledge about serial I/O is rather clumsy, but isn't there a
>  > >  virtual COM port attached, or can't you attach a virtual COM port to
>  > >  your USB I/O?  AFAIK, you should find something like, say, COM9, which
>  > >  would be available as /dev/com9 or /dev/ttyS8.
>  >
>  > My knowledge to Window machine is also limited. So, I should open
>  > /dev/com9 or /dev/ttyS8 regardless it is connected to a serial cable
>  > or a USB serial adaptor. I don't have the Window machine at home, I'll
>  > try next day.
> I didn't say you should open /dev/ttyS8.  This was just an example.  You
>  first have to find out (or set?) the number of the virtual COM port.
>  For all I know it could be COM5 or COM12 or whatever.  The important
>  part is that, after you *know* the number X, you can use /dev/comX or
>  /dev/tty[X-1] to access this serial port.  Just don't access it using
>  the Windows name, COMx or \\.\COMx, because then you will not get any
>  POSIX serial I/O support from Cygwin.

Thanks  Corinna, it works under /dev/comx. One more thing, if a serial
port is not connected by a serial cable, it can still open a serila
port without errors. That was very stange to everybody when a problem
printed out "Open Serial Port /dev/com1 success", but actually there
was no cable connected to that port. Is it a bug in Cygwin?

Thank you.

Kind Regards,


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