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Author Topic: DMX cables  (Read 13371 times)

Kemper Watson

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Re: DMX cables
« Reply #20 on: November 13, 2010, 05:39:07 pm »

So the higher the ohms the better to transmit data?
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Rob Spence

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Re: DMX cables
« Reply #21 on: November 13, 2010, 05:49:14 pm »

Kemper Watson wrote on Sat, 13 November 2010 17:39

So the higher the ohms the better to transmit data?

No.

The impedance (not resistance) of the cable needs to match to the circuits in each device and the final termination such that there are no disruptions to cause reflections which will corrupt the digital data. Note that "matching" doesn't mean same impedance. It means the correct number for the design. This is true for all digital transmission.

DMX design specifies a specific cable. Simple. It is only the popularity of inexpensive DMX devices with 3 pin connectors that has led people to use microphone cable because it looks right visually. The fact that it works much of the time for small configurations has led people to make all sorts of erroneous assumptions.
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Rob Spence
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Bob Goodwin

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Re: DMX cables
« Reply #22 on: November 14, 2010, 02:04:49 pm »

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?
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Rob Timmerman

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Re: DMX cables
« Reply #23 on: November 14, 2010, 03:22:29 pm »

Bob Goodwin wrote on Sun, 14 November 2010 14:04

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?


What does the fixture manufacturer recommend?
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Rob Spence

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Re: DMX cables
« Reply #24 on: November 14, 2010, 03:55:22 pm »

Bob Goodwin wrote on Sun, 14 November 2010 14:04

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?

If they are DMX, then the "right" answer is DMX cable.
That said, if they are close together (under 100'), it likely that an XLR cable will work.
Rob is right, what does it say in the manual? You did read it, right?
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Rob Spence
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Bob Goodwin

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Re: DMX cables
« Reply #25 on: November 14, 2010, 05:14:09 pm »

I presently don't have any lights. I happen to read owners manuals when I get them. Thanks for the help!
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Micky Basiliere

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Re: DMX cables
« Reply #26 on: November 14, 2010, 09:14:44 pm »

Rob Spence wrote on Sun, 14 November 2010 15:55

Bob Goodwin wrote on Sun, 14 November 2010 14:04

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?

If they are DMX, then the "right" answer is DMX cable.
That said, if they are close together (under 100'), it likely that an XLR cable will work.
Rob is right, what does it say in the manual? You did read it, right?



Just use a G.D. Mic cable and be done with it! this IS NOT rocket science... Very Happy
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Micky Basiliere
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Bob Goodwin

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Re: DMX cables
« Reply #27 on: November 14, 2010, 09:34:03 pm »

Micky Basiliere wrote on Sun, 14 November 2010 21:14

Rob Spence wrote on Sun, 14 November 2010 15:55

Bob Goodwin wrote on Sun, 14 November 2010 14:04

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?

If they are DMX, then the "right" answer is DMX cable.
That said, if they are close together (under 100'), it likely that an XLR cable will work.
Rob is right, what does it say in the manual? You did read it, right?



Just use a G.D. Mic cable and be done with it! this IS NOT rocket science... Very Happy




Gee, I'm sorry I asked. I thought this was a good place to ask a question. I'll try another Forum next time.
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Micky Basiliere

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Re: DMX cables
« Reply #28 on: November 14, 2010, 11:38:09 pm »

[quote title=Bob Goodwin wrote on Sun, 14 November 2010 21:34]
Micky Basiliere wrote on Sun, 14 November 2010 21:14

Rob Spence wrote on Sun, 14 November 2010 15:55

Bob Goodwin wrote on Sun, 14 November 2010 14:04

I'm afraid to ask but here goes:  If I just want to link 2 LED pars together so that they fade and change colors together (Slave and Master???) without a controller, what kind of cable do I use?

If they are DMX, then the "right" answer is DMX cable.
That said, if they are close together (under 100'), it likely that an XLR cable will work.
Rob is right, what does it say in the manual? You did read it, right?



Just use a G.D. Mic cable and be done with it! this IS NOT rocket science... Very Happy



Sorry man...This topic is just out of control! you will NEVER notice a difference between Mic and "DMX" cable in the 3 pin config. 5 pin would definetly be of the "dmx" type...Have a great night. Smile
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Micky Basiliere
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Mac Kerr

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Re: DMX cables
« Reply #29 on: November 14, 2010, 11:45:01 pm »

Micky Basiliere wrote on Sun, 14 November 2010 23:38


Sorry man...This topic is just out of control! you will NEVER notice a difference between Mic and "DMX" cable in the 3 pin config. 5 pin would definetly be of the "dmx" type...Have a great night. Smile


Why would 3 pin be different than 5 pin? It is only using 3 pins. The signal is also impedence sensitive and should have 110Ω cable. Mic cable usually works, but not always. When it doesn't work, do you want to trace where on the truss the problem is?

Mac
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