USB Port Wierdness

[D. Hugh Redelmeier]

| From: phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org

| We have our oscilloscope project working nicely over a USB line, using an
| FTDI usb-serial adaptor chip in the scope hardware. From our tcl program,
| we simply open /dev/ttyUSB0 and treat it as a serial port.
| 
| However, this only works reliably when operating as root.

I think that details might differ with each distro.

read the udev(8) man page.
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