Virtual COM port on Linux

Nicholas Leippe nick at leippe.com
Mon Mar 15 11:56:04 MDT 2010


On Mon, Mar 15, 2010 at 10:40 AM, Dave Smith <dave at thesmithfam.org> wrote:
> Byron Clark wrote:
>> On Tue, Feb 23, 2010 at 09:04:18AM -0700, Dave Smith wrote:
>>> Has anyone gotten a USB device that requires "Virtual COM Port" support
>>> to work in Linux? I'm considering employing this relay[1] to perform a
>>> nightly reboot of my pile-of-junk Comcast cable modem.
>>
>> It looks like it uses the FTDI chip so it should work fine with any
>> 2.6.x kernel.
>
> The part arrived today and after a few minutes of hacking, it works
> beautifully. I didn't have to install or configure anything for
> /dev/ttyUSB0 to appear. And now I have a very simple python script that
> can turn the relay on:
>
>   f=open("/dev/ttyUSB0","wb")
>   for byte in [0xff, 0x01, 0x00]:
>     f.write(chr(byte))
>   f.close()
>
> (Is there a one-liner to do this?)

echo -n \xff\x01\x00 > /dev/ttyUSB0


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