Serial port using USB adaptor
Fri Feb 29 13:06:00 GMT 2008
On 2/29/08, Corinna Vinschen <email@example.com> wrote:
> On Feb 29 12:43, hce wrote:
> > Hi,
> > I have a linux serial port problem compiled by Cygwin on window, it
> > runs fine if it connects a 9-pin serial cable and the device name is
> > /dev/ttyS0 (it does not work with com1, I have to translate it to
> > /dev/ttyS0). The problem is when I run the program in a PC without a
> > physical 9-pin serial port on hardware:
> > (1) If there is no USB Serial adaptor connected, it still opens
> > /dev/ttyS0 without any errors. Then, it sends data to that port, and
> > timeout (does not work).
> > (2) If I plug a USB-Serial adaptor and change the device name to
> > /dev/ttyUSB0, it opens that port witout problem but cannot connect to
> > the serial device.
> /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.
> 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.
Thank you Corinna.
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