How Do I Use CDC Usb Ports?

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I want to use a USB CDC port. I was under the impression that they were not all that hard to use.
‘Tain’t going well for me.

lsusb | grep ega tells me Bus 007 Device 007: ID 2341:0042 Arduino SA Mega 2560 R3 (CDC ACM)
As root, cat-ing /dev/bus/usb/007/007 gives me garbage. As anyone else, I get a permission denied error. Usually, though not lately, a /dev/ttyS? shows up at about the same time as the …/007/* device.

How, without continuously running as root, do I get access to CDC usb devices?
I’ve tried making myself a member of dialout, but it doesn’t seem to take. I’ve tried both lgroupmod -M hennebry dialout oIt doesn’t seem to take.and usermod -a -G dialout hennebry .

How do I tell which one I want?
I’m guessing I can’t use /dev/bus/… . How do I tell which /dev/ttyS? I want?