Serial port using USB adaptor

Corinna Vinschen
Fri Feb 29 13:42:00 GMT 2008

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.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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