chatterbox Posted August 17, 2011 Share Posted August 17, 2011 Hi, Just doing an install and found that the builders had already run a cable from the stage to the back of the room mixing point. They labelled the socket "lighting control" and terminated it on a DMX connector. The cable they used is the following: Overall Screened, Multi Pair Application: Internal and external inter-connections of electronic apparatus such as computers, intercoms, telemetering, signalling and alarm systems. Conductor: Tinned annealed copper wire Insulation: Polypropylene; thickness: 0.30mm Screen: Aluminium tape screen, polyester mylar tape lapping and 7/0.20mm tinned copper drain wire Sheath: PVC V75 (grey) Voltage: These cables are run with a 240V radial thickness sheath and must not be connected to mains power supply. Standards: AS1125 (conductor) AS/NZS 3808 (PVC) Austel Approval: A95/CA/0217, EAS7201P to EAS7212, EAS7212P+1 Is this suitable for DMX ????????????? I dont think so, but am curious as to others input....... Link to comment Share on other sites More sharing options...
pritch Posted August 17, 2011 Share Posted August 17, 2011 Might be alright. Looking at the 'Application' line, it's looking like it could be RS485 cable. Do you happen to know what the impedance is? Link to comment Share on other sites More sharing options...
chatterbox Posted August 17, 2011 Author Share Posted August 17, 2011 no - sorry dont know the impedance. I googled the name on the cable and this is what I got.... Link to comment Share on other sites More sharing options...
savage1 Posted August 17, 2011 Share Posted August 17, 2011 I'm not an expert... in fact I'm not even a lighting guy but that sounds like it'll do DMX or cat 5 quite happily. Try it and see? Link to comment Share on other sites More sharing options...
chatterbox Posted August 17, 2011 Author Share Posted August 17, 2011 just found the resitance : 65 pF/m ohms/100m - loop DCR 11.9 - conductor resistance 8.6 - screen resistance 7.6 Link to comment Share on other sites More sharing options...
pritch Posted August 17, 2011 Share Posted August 17, 2011 Resistance != Impedance, though; capacitance and inductance both have a part to play. What's the name of the cable and manufacturer? Link to comment Share on other sites More sharing options...
chatterbox Posted August 17, 2011 Author Share Posted August 17, 2011 Resistance != Impedance, though; capacitance and inductance both have a part to play. What's the name of the cable and manufacturer? Its electra cables eas7021p austel approved... Link to comment Share on other sites More sharing options...
david.elsbury Posted August 18, 2011 Share Posted August 18, 2011 Have you considered emailing (or, shock horror, phoning) the manufacturer? They will have the definitive answer. Link to comment Share on other sites More sharing options...
chatterbox Posted August 18, 2011 Author Share Posted August 18, 2011 Yes - did consider it...but (we are in Australia) and therefore the chances are that the manufacturers will not know what I am talking about... It will be another famous AUSTRALIAN GREY AREA.....(cynical - I know) I will probably get more sense from this forum..... Link to comment Share on other sites More sharing options...
david.elsbury Posted August 18, 2011 Share Posted August 18, 2011 Yes - did consider it...but (we are in Australia) and therefore the chances are that the manufacturers will not know what I am talking about...It appears you need to do your research a little better - a quick Google for "Electra Cables" turned up the following link in the top 3 results... http://www.electracables.com.au/ If you look closely on the front page, you'll even see some contact details... I would hope that they would know the specs of the cable they make (DMX cable is electrically the same as RS485 communications cable, if they don't understand what you are on about when you say DMX) :) Link to comment Share on other sites More sharing options...
chatterbox Posted August 18, 2011 Author Share Posted August 18, 2011 I dont think you actually read the post... I didnt say I couldnt find any contact details...... Link to comment Share on other sites More sharing options...
david.elsbury Posted August 18, 2011 Share Posted August 18, 2011 Fair enough, but surely the first and most logical and accurate step is to contact the manufacturer instead of posting on a (British) forum where almost no one will have heard of the cable in question? :) Link to comment Share on other sites More sharing options...
chatterbox Posted August 18, 2011 Author Share Posted August 18, 2011 maybe but then I do like to get feedback from this forum... some very interesting and intelligent answers.... well - just to keep you happy :D I phoned the manufacturers.... and guess what - qld head office said what did I want to know - I told them - she said " I have absolutely no idea - you will have to call head office"so I called head office and was told.." I dont know what you are talking about - you will have to talk to the person you bought it from" I said " we havent bought it - it has been installed by builders on a job we are doing" she said " well I cant help you - you will have to talk to someone else" end of conversation.. which just proves the point of my earlier post (we are in Australia) and therefore will get more sense from a Britsh forum -even if they are not familiar with the cable..... Link to comment Share on other sites More sharing options...
pritch Posted August 18, 2011 Share Posted August 18, 2011 Well, these people: http://www.leonaudio.com.au/14chcuelight.pdf are recommending that exact cable for use with their RS485 based cue light system, so I strongly suspect your cable will do the job for DMX. Link to comment Share on other sites More sharing options...
chatterbox Posted August 18, 2011 Author Share Posted August 18, 2011 yes I found that when googling..... we will test it next week and see what happens........if it works - it is a very cheap alternative to DMX cable..... Link to comment Share on other sites More sharing options...
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