[PD] looking for open dmx external

Peter Plessas plessas at mur.at
Wed Oct 8 02:13:52 CEST 2008

Thanks David and Damian for the useful information,

i guess Olaf Matthes told me sth. about the timing issue as well, where 
certain DMX dimmers refuse messages which don't come in a certain time 
frame, or otherwise synchronized pattern. Seems the Enttec USB Pro comes 
with a microcontroller on board which rearranges messages into that timing.


Damian Stewart wrote:
> David Kirkpatrick wrote:
>> Hi Peter,
>> The Open DMX has stability problems and the fading is jolty sometimes. 
>> Something to do with not being able to store an entire DMX frame at 
>> the same time I think. I read an article a while ago that explained 
>> the exact differences, but I can't seem to find it again.
> actually, the Open DMX is just a standard FTDI-based USB to serial 
> adapter with the outputs wired into a 5-pin DMX plug. in other words, 
> you could achieve exactly the same with a standard serial port, wiring 
> up the RX/TX lines into the right pins. this is all the Open DMX is on 
> the inside. the system driver takes care of the timing, and doesn't do a 
> very good job of it at all.
> definitely go with the Pro.

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