Following on from my last post "should I do this with
DMX cable" I have been given some cable that is shielded twisted 2pr along the lines of Belden 8723 which has an
impedance of 52
ohm and about 15
ohm resistance per
meter https://catalog.belden.com/techdata/EN/8723_techdata.pdf
Can this be used successfully for an install
DMX run from box to
stage?
I am really interested in results here as I have quite a
bit of it and a little project I could use it for.
Regards
Geoff
@Crisp image [ 15 Ohms DC resistance per
Meter !!?? Say it isn't so. ] I believe I read 15 Ohms per 1,000 feet in the link you provided.
I expect I'll be crucified for posting this; even at the risk of being turned into a pillar of salt, here goes:
DMX is an amazingly robust
protocol. If it's easy for you, strip and connect the ends of your cable and try it. Test it in a NON CRITICAL situation, NOT DURING A PERFORMANCE. If you have 500 or 1,000' of the cable on
hand on a reel or in an Un-Reel cardboard box, fish out both ends and test the heck out of it. Observe all termination rules and run lots of data through it. If
RDM is a requirement, be certain you've tested that too.
If it works flawlessly at 1,000' and your intended application is 500' or less, it's likely you're safe to proceed with your installation.
If it basically works at 1,000' but is slightly erratic AND your proposed installation is less than 300', you're likely going to get away with it.
- Perform ALL tests prior to investing time and effort on your actual installation, the neat and proper installation you're planning to do WITHOUT breaking any other rules.
- Would I risk this on an install in another country six hours away by air when my boss's corporate reputation is on the
line:
NO WAY!!
- Would I try this at home when donating my time to a local
amateur theatre group: IN THE BLINK OF AN EYE.
-
Remember: You're reading this on the internet, posted by a stranger from the opposite side of our
globe; few strangers are STRANGER than this guy.
- This advice is worth every penny you're
not being charged for it.
This old geezer'll crawl back in his cave and NEVER admit to posting this.
Toodleoo! ( From another of the colonies. )
Ron ( I can feel lighting bolts about to
strike me as I'm typing this. ) Hebbard