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.
I have had no issues with the Pro at all. So definitely go with the Pro if you can. It isn't that much more expensive anyway, and it just doesn't break.
David Kirkpatrick
- David Kirkpatrick djk_1200@hotmail.com [2008-10-04 13:24]:> Sadly I don't have a linux version of Adrian's [dmxsend] object. He made it specifically for a Windows based theatre work I was doing. [dmxsend] is also designed to work with the Enttec DMX USB Pro, not the Enttec Open DMX. The two devices work quite differently. David, do you know in what respect they differ? Which one is better? Peter
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.
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@frey.co.nz frey | live art with machines | http://www.frey.co.nz
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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.
regards, PP
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.
-
Damian Stewart -
David Kirkpatrick -
Hans-Christoph Steiner -
Peter Plessas