If you have some more advanced serial port that supports that data rate (some USB->RS232 adapters, maybe some multi port RS-232 PCI cards etc..) and you have a RS232 to RS485 converter that operates at the needed data rate, then it should be possible in a way or another send out DMX-512 data.
For example there are several USB to DMX-512 adapters on the market that just consists of FTDI USB->RS232 converter chip connected to RS485 line driver. And some open designs how to build your own
http://www.enttec.com/index.php?main_menu=Products&prod=70303&show=description&name=opendmxusb
http://www.nextec.co.uk/Free-USB-DMX-Hardware-Project/Free-DMX-Project-Schematic-download.html
http://www.nextec.co.uk/Drivers-and-Downloads.html
http://dj-online.co.uk/acatalog/Afterglow_Magic.html
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