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'RS232 to DMX converter'
1999\08\29@114436 by Edson Brusque

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1999\08\30@121602 by Edson Brusque

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Hello!

   I'm new to this list and also new to the PIC controllers.

   I want to know if anyone knows a <RS232 to DMX> or ar <Paralell
(Centronics) to DMX> converter using PIC (preferably)? Where can I find it?

   If the converter makes the other way (DMX to RS232 or DMX to Paralell)
it would be great.

   To the ones who doesn't know, DMX is a RS485 interface working at
250KBauds used for lightning control.

   Thanks and best regards,

   Brusque

1999\08\30@122853 by Adam Davis

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Go to
http://users.skynet.be/kristofnys/

for a simple DMX dongle.

A *very* useful website for DMX is at
http://www.geocities.com/Broadway/2006/index.html

-Adam

Edson Brusque wrote:
{Quote hidden}

1999\08\31@012248 by William K. Borsum

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At 01:08 PM 8/30/99 -0700, you wrote:
>Hello!
>
>    I'm new to this list and also new to the PIC controllers.
>
>    I want to know if anyone knows a <RS232 to DMX> or ar <Paralell
>(Centronics) to DMX> converter using PIC (preferably)? Where can I find it?
>
>    If the converter makes the other way (DMX to RS232 or DMX to Paralell)
>it would be great.
>
>    To the ones who doesn't know, DMX is a RS485 interface working at
>250KBauds used for lightning control.

"LIGHTNING" control--as in  thunder and lightening?

Would appreciate a little more information on DMX.  Sounds Interesting.

Kelly


William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems
<spam_OUTborsumTakeThisOuTspamdascor.com> & <http://www.dascor.com>

1999\08\31@065852 by Nigel Orr

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At 22:21 30/08/99 -0700, you wrote:
>"LIGHTNING" control--as in  thunder and lightening?

No, lighting, as in stage lighting ;-)

>Would appreciate a little more information on DMX.  Sounds Interesting.

Not much to it, just a string of data sending channel numbers and dimming
levels.  As it doesn't control lightning, I guess it doesn't sound so
interesting any more  ;-P

Nigel

1999\08\31@092124 by Harold M Hallikainen

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       DMX is a lighting control signal sent using EIA485 levels at 250 kbps.
A packet consists of:

       1.  Break
       2.  Mark after break
       3.  Start Code (0x00 for most lighting devices)
       4.  Up to 512 bytes where each byte is a lighting level (0x00 to 0xff)

       Each byte is sent as:

       start bit
       8 data bits
       2 stop bits

Harold



On Tue, 31 Aug 1999 11:56:39 +0100 Nigel Orr <.....nigel.orrKILLspamspam@spam@NCL.AC.UK>
writes:
{Quote hidden}

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1999\08\31@110059 by Harold Hallikainen

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On Mon, 30 Aug 1999 13:08:43 -0700 Edson Brusque <brusquespamKILLspamFLYNET.COM.BR>
writes:
>Hello!
>
>    I'm new to this list and also new to the PIC controllers.
>
>    I want to know if anyone knows a <RS232 to DMX> or ar <Paralell
>(Centronics) to DMX> converter using PIC (preferably)? Where can I
>find it?
>
>    If the converter makes the other way (DMX to RS232 or DMX to
>Paralell)
>it would be great.
>
>    To the ones who doesn't know, DMX is a RS485 interface working at
>250KBauds used for lightning control.
>

       See the StarPort at http://www.dovesystems.com .  It is parallel
to DMX (both transmit and receive DMX).  It uses the 16c74 and is being
changed to the 18c452.

Harold


Harold Hallikainen
.....haroldKILLspamspam.....hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

___________________________________________________________________
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1999\08\31@111332 by Bob Blick

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> At 22:21 30/08/99 -0700, you wrote:
> >"LIGHTNING" control--as in  thunder and lightening?

No, that'd be MIDI, not DMX-512 :-)

Cheers,
Bob

1999\08\31@112003 by Adam Davis

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Heavens, no!  Hardwire all your flash pots...  Well... *MAYBE* Midi... <grin>

-Adam

Bob Blick wrote:
>
> > At 22:21 30/08/99 -0700, you wrote:
> > >"LIGHTNING" control--as in  thunder and lightening?
>
> No, that'd be MIDI, not DMX-512 :-)
>
> Cheers,
> Bob

1999\08\31@112412 by Adam Davis

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At $600.00  it's a bit pricey.  I assume it's CE and FCC approved?

-Adam

Harold Hallikainen wrote:
{Quote hidden}

1999\08\31@112754 by Nigel Orr

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At 06:22 31/08/99 -0700, you wrote:
>        1.  Break
>        2.  Mark after break
>        3.  Start Code (0x00 for most lighting devices)
>        4.  Up to 512 bytes where each byte is a lighting level (0x00 to
0xff)

I don't remember the details, but aren't they pairs of address and level?
Nothing in the above tells you which light is being controlled, and you can
have lots of lights/dimmers in parallel on the bus.

Nigel

1999\08\31@114205 by Adam Davis

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This is a digital multiplexing system, nothing more.

The idea is only to transmit 512 dimmer levels over a twisted pair cable.  So
they start the frame with a break, send a start code (which is defined as 0x00
until they release the next spec) and the 512 (or less) dimmer levels are sent
in order in 8bit bytes, 1 start bit, 2 stop bits.  A break is sent, and the next
frame starts.  It's possible to send 44 frames/sec at 250Kbps, with each of the
512 values included.  You can send shorter frames by ending the transmission
anywhere after the start byte.  ie, the dongle you can build mentioned on this
thread only controls 64 lights, so it sends the first 64 bytes after the start
byte, and then sends the next frame, etc.  The last 448 dimmer channels are
never sent.  Using this method, it's possible to send the values for all 64
channels over 300 times/second.

You can get a somewhat more detailed description on my site at:
http://www.ubasics.com/adam/electronics/dmx512.shtml


-Adam

Nigel Orr wrote:
{Quote hidden}

1999\08\31@134814 by Anne Ogborn

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Wee - Haw!

You mean there's a protocol for controlling lightning?

That's great!  I can think of lots of applications for
that. The IRS, Bill Gates, assorted political figures,
some televangelists...

<SOT><LGHTVOLTS>100000000<TARGET>Bill Gates<REGION>Redmond, WA<CRC>46FA<EOT>

Hey, whoever has this control - please, please hook it to
a socket! That way we can all join the fun!
Oh, and while you're at it, could you do something about that
hurricane??

Bet designing the isolation for THAT was tough. BIG optocouplers.


--
Anniepoo
Need loco motors?
http://www.idiom.com/~anniepoo/depot/motors.html

1999\08\31@151310 by Harold Hallikainen

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On Tue, 31 Aug 1999 16:27:03 +0100 Nigel Orr <@spam@nigel.orrKILLspamspamNCL.AC.UK>
writes:
>At 06:22 31/08/99 -0700, you wrote:
>>        1.  Break
>>        2.  Mark after break
>>        3.  Start Code (0x00 for most lighting devices)
>>        4.  Up to 512 bytes where each byte is a lighting level (0x00
>to
>0xff)
>
>I don't remember the details, but aren't they pairs of address and
>level?
>Nothing in the above tells you which light is being controlled, and
>you can
>have lots of lights/dimmers in parallel on the bus.
>

       The standard (using start code 0) does not send addresses.  It is
assumed that the first byte (after the start code) drives dimmer 1, the
second dimmer 2, etc. up to a maximum of 512 dimmers.  There have been
proposals to include some sort of data compression using RLL or similar,
but, at least with a start code of 0, it's just ordered data.  It's
likely to stay that way for bnackward compatability.  Other start codes
may use different formats.

Harold


Harold Hallikainen
KILLspamharoldKILLspamspamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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