if you've got enough data to warrant it, the enttec pixelator mini and PLinks (takes up to 16 universes of data) would take in Artnet straight out of your computer and do any other conversion internally.

I also use enttec playback wing. I love the cherry mx keys and build quality. the price is great too. although it is just midi values so I suppose they couldn't charge too much!
very happy with mine though.

ENTTEC usb units are super sensitive to firmware updates and really have to be used in conjuncture with the latest of everything. their own firmware, software they're used with as well as system updates. get the ODE or ethergate which are more reliable and use the industry standard dmx over ethernet...

or the enttec ethergate (is like the double ode) if you've got enough data to need two physical dmx in/outs

Depending on how many universes you have to control, Enttec also do the 'pixie driver' (takes in DMX). for non pixel led tape (constant voltage... all the LEDs do the same thing at once) there is the CV driver (takes in DMX). you can control both kinds of these tapes with the 'pixelator mini' and va...

Agree with Joris, the fixtures won't know how you came out of your pc. Signal will be dmx by then. I've used this ENTTEC node and found it simple, reliable and cheap. I hear the new versions come with inbuilt web servers in them too so you can configure protocol and directionality with any browser. ...

Dont ever get the open dmx. it has no optical isolation (so if there is a slight surge in power your rs485 chip will burn up) and cannot regulate timing of packages being sent out. The dmxusb pro might be an extra 55quid but its worth it. You'll only end up buying one when you accidentally fry the o...