Reply by Jan Panteltje April 15, 20142014-04-15

Cheapest way to add USB and 5 V and 3.3V  power to a RS232 PIC project
 Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module Converter Adapter for arduino
 ebay object: 360750555245 

Module has 5V and 3.3 V out (from the USB power).
The PL2303 works 100% OK with Linux native drivers.
Just connect to RS232 in and RS232 out, and power, 
and no need to write USB code, or get a special PIC, or bother about licenses,
or maxmin^h^him chips.
and all that at only 99 dollar cents a piece.
I just build one into an existing RS232 project, simplifies a lot of things.
Any terminal program or script can talk to it.

It is also a lot cheaper than external USB to RS232 adaptors (wut hte same chip!),
just solder the pins into your board.

# lsusb
Bus 005 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port