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Re: Serial port using USB adaptor
- From: hce <webmail dot hce at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Sat, 1 Mar 2008 20:20:21 +1100
- Subject: Re: Serial port using USB adaptor
- References: <email@example.com> <20080229094523.GR9539@calimero.vinschen.de> <firstname.lastname@example.org> <20080229115254.GA7989@calimero.vinschen.de>
On 2/29/08, Corinna Vinschen <email@example.com> wrote:
> On Feb 29 22:20, hce wrote:
> > On 2/29/08, Corinna Vinschen <firstname.lastname@example.org> 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?
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