Problem opening new serial ports
Gary Johnson
garyjohn@spk.agilent.com
Tue Aug 5 20:36:00 GMT 2008
I've been successfully using the original two serial ports on my
Windows PC, COM1 and COM2, referring to them to Cygwin tools as
/dev/ttyS0 and /dev/ttyS1, respectively. I needed two more serial
ports, so I used a device that plugs into a USB port on a PC and
provides two serial ports. The device is an Edgeport/2 USB
Converter. I installed the drivers and now the Windows Device
Manager shows the following under "Ports (COM & LPT)":
Communications Port (COM1)
Communications Port (COM2)
EdgePort [V20853020-0] Serial Port - 1 (COM24)
EdgePort [V20853020-0] Serial Port - 2 (COM25)
plus devices on LPT1, COM4 and COM5.
Cygwin tools don't seem to be able to find these two new ports. For
example:
$ stty < /dev/ttyS23
bash: /dev/ttyS23: No such file or directory
$ stty < /dev/ttyS24
bash: /dev/ttyS24: No such file or directory
Is there something else I need to do to get Cygwin to recognize
these ports? Do they look like serial ports to Cygwin, or does
Cygwin see only the USB port?
I have not rebooted the machine since installing the EdgePort device
since I have experiments running on it at the moment.
Regards,
Gary
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