RS232 / USB read/write?

[Brian Hay]

I'm a bit green with D. I've done some basic D1 + Tango + Derelict stuff 
but am keen to learn more about D2 + Phobos.

As a learning project I thought I'd like to try reading/writing data 
streams from/to RS232 and/or USB devices, something I've never done 
before in any language.

Can anyone give me some pointers and online references? Are there any D 
libraries for this?