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New DMX interface type
Posted: 24 Aug 2007, 18:48
by kevvywevvywoo
Ive built an RS232 (on com2) to DMX (RS485) converter, I can only get it to transmit DMX at half the normal baud rate and using the MiniDMX interface setting. Is it necessary to manually set the Baudrate via Windows Control Panel, and if so, what should be set? Does FS automatically set stop bits etc? Is the DMX framing all set via FS or do all compatible interfaces buffer and reframe the DMX? thanks
Re: New DMX interface type
Posted: 06 Sep 2007, 03:16
by matt
wow..... i honestly don't know.. I would say with com ports, play around with the settings till it works right.. i can see the fun in building your own.. but i would just get an enttec open.. just because i know that they are reliable.
Re: New DMX interface type
Posted: 23 Sep 2008, 17:47
by jasonlights
Have any one got this working. I have some rs-232 rs-485 converters coming.
Re: New DMX interface type
Posted: 23 Jan 2010, 21:43
by Spav
I would be surprised if you can get the speed right from a standard PC com port 115.2K is the usual top rate doubling this to 230.4K is unlikely to be close enough. The simple hardware in the PC serial port has insufficient resolution in the clock and it's dividers to get to the 250K needed.
Re: New DMX interface type
Posted: 17 Mar 2010, 22:38
by jpk
For reference the Enttec Open DMX unit uses an FTDI FT232 device which is essentially a COM port however it can be configured to operate at 250kbps. It's not ideal as all timing is then dependant on the computer. You're much better off using something that buffers externally and looks after all the DMX512 timing for you, the Pro unit does this but it's open source so if you don't want to buy it and have the time and resources just DIY!
Jason