So I just picked up Enttec's DMX USB Pro, with the understanding that it was compatible with OS X and that it could be used with Pure Data. I seem to have found a Max external, but haven't found one for PD... the link on Enttec's website is just for Max, despite specific mention of PD... http://www.nullmedium.de/dev/dmxusbpro/

Has anyone used the DMXUSBPro with Pure Data? Help!

Many thanks...

i've been searched for this a lot of time, finally i have change to ArtNet. I've built an external for linux but only receives. With the libartnet should be easy built another external to transmit.

I think the best option now and in the future in lighting control for pure data is built an external to comunicate with Open Lighting Arquitecture

http://www.opendmx.net/index.php/Open_Lighting_Architecture

I've read a bit the API, but is in C++ code, i know a litlle C but i don't a programmer, i don't know how call a C++ function for the C external... Supports a lot of protocols and interfaces and is multipatform (OSX and linux working now, windows in progress). There is an external for MAX/MSP on OSX (i don't know if can be used with pd, or if is easy adapt it):

http://www.opendmx.net/index.php/OlaOutput_Max_External

Maybe you already solved this, but if not, I came across this site:
http://wiki.labomedia.org/index.php/Pure_Data_vs_Enttec_Pro

It's in french but I think it says that you simply could send messages to a comport object to set dmx values on the usbpro. If I got it right the message should look like this: [126 6 2 0 0 $1 $2 $3 ...etc $511 $512 231(
Where 126 6 2 0 0 is just to tell that sonn comes the dmx values, and $1 $2 $3... represents the dmx values you want to set on channels 1, 2 and 3.
231 at the end is supposed to be some kind of stop sign.

I am not able to test this since I don't own a DMXUSBpro, but if you get it to work please tell, and i will probably buy one for myself.