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Author Topic: DMX termination madness  (Read 3832 times)

Dave Potter

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DMX termination madness
« on: March 15, 2013, 05:29:34 AM »

So, I'm still new to all of this and since buying a pair of Chauvet LEDslim Par 56 and a pair of LEDJ Tripar 56 I have not had a chance to use them (band misbehaving  ::) ).  I decided to test them with my new Acme 0408 controller.  All set to different (correct) addresses, daisy chained, and terminated with a 120ohm plug. 

Result:- flashy, crazy colour madness! I removed the terminator and all was sweet.  I checked the terminator and it is wired corectly with a 120ohm across pins 2 and 3.  So what am I missing?
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Jordan Wolf

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Re: DMX termination madness
« Reply #1 on: March 15, 2013, 09:47:06 AM »

Dave,

Are you using it at the end of your signal path?  Also, some devices have built-in termination…check on that.
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Josh Daws

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Re: DMX termination madness
« Reply #2 on: March 15, 2013, 01:06:21 PM »

most (newer) fixtures will have self termination. negates the use of even needing one.

its good to have in your bag of tricks, but rarely is it necessary to actually use one. unless you are on "larger rigs"
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Dave Potter

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Re: DMX termination madness
« Reply #3 on: March 15, 2013, 01:24:14 PM »

Self termination?  That sounds cool ..... and electrically magic.  How can every fixture terminate if there is a subsequent fixture?
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Randall Hyde

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Re: DMX termination madness
« Reply #4 on: March 15, 2013, 03:02:33 PM »

Self termination?  That sounds cool ..... and electrically magic.  How can every fixture terminate if there is a subsequent fixture?

They sense whether downstream devices have a terminator and add/remove the terminator as appropriate.
Cheers,
Randy Hyde
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James Feenstra

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Re: DMX termination madness
« Reply #5 on: March 15, 2013, 05:08:01 PM »

most (newer) fixtures will have self termination. negates the use of even needing one.
no, they don't

Terminators cause as many problems as they solve. I put together hundreds of lighting rigs and can't remember the last time I actually used one, but they're always in my work box.
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Dave Potter

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Re: DMX termination madness
« Reply #6 on: April 23, 2013, 06:31:02 AM »

Quote
can't remember the last time I actually used one, but they're always in my work box.
Electronically, this makes sense to me - and might even solve a network control problem at my day job.
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Tom Bourke

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Re: DMX termination madness
« Reply #7 on: April 27, 2013, 01:34:27 AM »

So, I'm still new to all of this and since buying a pair of Chauvet LEDslim Par 56 and a pair of LEDJ Tripar 56 I have not had a chance to use them (band misbehaving  ::) ).  I decided to test them with my new Acme 0408 controller.  All set to different (correct) addresses, daisy chained, and terminated with a 120ohm plug. 

Result:- flashy, crazy colour madness! I removed the terminator and all was sweet.  I checked the terminator and it is wired corectly with a 120ohm across pins 2 and 3.  So what am I missing?

Cable type and length?  DMX termination is all about controlling reflections of the digital control signal.  Having mismatched or non DMX rated cables can also cause problems.
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Re: DMX termination madness
« Reply #7 on: April 27, 2013, 01:34:27 AM »


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