ENTTEC's DMX USB Pro is an inexpensive device that will allow you to output DMX from a computer based lighting controller to your lighting rig, or input DMX from an external controller in to your lighting visualizer of choice. On-board chips handle timing and signal processing so you can always expect to get a clean, reliable, signal. It works with a wide variety of commercial, shareware and freeware lighting applications and features drivers for Windows, OS X and Linux.

Entec DMX Pro USB (Enttec DMX-USB Pro)