[PD] looking for open dmx external

[Hans-Christoph Steiner]

On Oct 6, 2008, at 4:48 PM, 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.

USB serial have pretty crappy timing in general, from my experience.   
I have banged my head against the FTDI driver quite a bit while  
working on Firmata.  If you need really tight timing, go with a real  
serial port.

.hc

>
> -- 
> damian stewart | skype: damiansnz | damian at frey.co.nz
> frey | live art with machines | http://www.frey.co.nz
>
>
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