Look up the specs for Belden 9842, accepted by many/most as the defacto industry standard.
Depends on the intended use. In conduit or out? Plenum or non-plenum? Next to hot lights? As an FOH snake?What's the best belden to use for three pin dmx
If you cut your cable apart, it better have TWO SEPARATE PAIRS or it really isn't DMX512.
I know there is a ton of what is called "excellent" DMX cable out there that is actually four conductors twisted together with one overall shield. In the computer world, we would call that "dumpster fill." Lucky for the manufacturer, DMX is a hearty signal that is unidirectional, and in most cases only two of the conductors are used. The cable works fine. But....... IT'S NOT DMX! (Despite what is printed on the rubber!)
Proper Construction: West Penn Wire Permanent Installation Bulk Cable
Look up the specs for Belden 9842, accepted by many/most as the defacto industry standard. Or Belden 9729 (or equivalent, as specified by ETC). Also, see attached: View attachment 6095
I know what you're saying, but it doesn't make it right! Cable manufacturers, even Belden, have been getting away with murder! No surprise. Two data lines = Two individual twisted pairs, not four conductors twisted together!
Yes, agreed, although I would not use it. My own opinion. But, my original statement was:
"I know there is a ton of what is called "excellent" DMX cable out there that is actually four conductors twisted together with one overall shield."
There are several major vendor that are selling DMX that is indeed four wires twisted together as one pair.
I can confirm that the Gepco DLC224 does in fact not have 2 individual pairs. The 4 insulated conductors have a common twist. Needless to say, I was not thrilled to discover this, but luckily I only bought 80ft. We bought some Horizon/Rapco DMX cable at my church that does have 2 individual twisted pairs.
Unless/until there's widespread adoption and agreement as to the use of the second pair (which there never will be, as the standard is nearing the end of its lifecycle), I'm not going to worry about it.
-----So once again getting assistance from Milton [Davis, of Doug Fleenor Design] here is the response:...Until you get into running significant distances (over 500 feet), the twisted pairs or 4 wires twisted probably won't matter much.
Regards,
Milton Davis, Engineer, ETCP-CEE-RT
Yes, JD, but I am in agreement with post #20 of the same thread:
Unless/until there's widespread adoption and agreement as to the use of the second pair (which there never will be, as the standard is nearing the end of its lifecycle), I'm not going to worry about it.
What's the best belden to use for three pin dmx
Belden 9841, but I don't like that it's only 24 ga. (not for capacity, but for durability) for portable use. I'd look for a cable for EIA RS-485 application with all of the criteria above: "(100-120Ω, 20-22g, heavy Black jacket, braided shield, but still flexible/coilable, ...) single pair + shield cable."Live events, daisy chaining fixtures. For use along the edge of a room, temp setup.
Belden 9841, but I don't like that it's only 24 ga. (not for capacity, but for durability) for portable use. I'd look for a cable for EIA RS-485 application with all of the criteria above: "(100-120Ω, 20-22g, heavy Black jacket, braided shield, but still flexible/coilable, ...) single pair + shield cable."
Or, just bite the bullet and buy TMB ProPlex PC244T.
"The bitterness of poor quality remains long after the sweetness of a low price is forgotten." --Benjamin Franklin
https://www.google.com/search?q=ela....,cf.osb&fp=bc929a60d4f7d321&biw=1228&bih=671...TMB's ProPlex and Tour-Plex is the absolute best, but I've heard (never used) Elation Accu-cable is acceptable for light-duty applications.
So I really don't care about the opinions here.. 4 pair twisted vs 2 pair pairs twisted... all i'm really looking for is good quality inexpensive 3 pin dmx cable. back to topic - does anyone have any leads?
So I really don't care about the opinions here.. 4 pair twisted vs 2 pair pairs twisted... all i'm really looking for is good quality inexpensive 3 pin dmx cable. back to topic - does anyone have any leads?
ANSI E1.27-1 - 2006 (R2011) also states that it is allowed to build portable cables that contain only the primary data pair provided they are marked with "Single pair" or "1-pair" and also marked with a violet band at least 1/2" wide within 2 inches of this marking. Of course, you still can NOT use the 3-pin XLR. You MUST use the 5-pin XLR (for what I hope are obvious reasons!)Portable DMX512 cables shall use twisted pair conductors. Conductors shall be of stranded construction. The raw cable used for a DMX512 cable assembly shall be declared by its manufacturer as suitable for use with EIA-422/EIA-485/EIA-485-A systems. Shielding shall be on individual pairs or overall shielding of pairs, or both. The portable cable itself shall be flexible and rugged enough for the repeated coiling and uncoiling to which it will be subjected.
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