USB to COM Port connections

[Mickey]

On 05/26/2015 08:30 AM, Dave Ihnat wrote:
> On Mon, May 25, 2015 at 08:20:41PM -0400, Mickey wrote:
>> Why is this a bad syntax ?
>>
>> # chmod 666 /dev/ttyACM0 –>  ( Why Is this a bad syntax)
> Octal.  "chmod 0666 /dev/ttyACM0".
>
> Cheers,
> --
> 	Dave Ihnat
> 	dihnat at dminet.com
I ran this command and got the following ERROR message;

su -c "chmod 666 /dev/ttyACMO"

Error message;

chmod: Cannot access '/dev/ttyACMO' :  No such file or directory

I get this error, No matter if I have the USB cable connected or 
disconnected to device .