Montaigne, Mike <PICLIST@MITVMA.MIT.EDU> wrote:

> I am involved with our church's annual Singing Xmas Tree, where we
> have an choir put on a concert in a 6 level tree shaped pyramid.
> We use Xmas tree lights in 4 colors and some special channels as
> well, all on dimmers. .... we now want to remote the control pots
> and I now need dc control rather than R/C time constant control as
> we want to run the controls ~200 ft away from the triacs/power
> boards. .... it seems to me, I could run RS422 signals as well on
> two wires.  Rather than re-inventing the wheel (fun but takes
> time), can any of you help me. Surely this has been done many times
> before - theater lighting etc.

Mike:

Yes, it's been done before; take a look at the DMX512 mini-FAQ at:

    http://waapa.cowan.edu.au/lx/dmx-faq.htm

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499