jcblincs Posted January 19, 2009 Share Posted January 19, 2009 sorry - I know this might have already been covered but I need a fast reply. Just about to order all our new DMX gear from 10outof10 and I noticed the cabling they sell as DMX cable is 110ohm. just reading another thread on DMX cables and it implies that proper cable is 120ohm. is this correct. ? where can I get a prewired proper 120ohm cable 30m long delivered by wed this week ? Link to comment Share on other sites More sharing options...
Dmills Posted January 19, 2009 Share Posted January 19, 2009 110 Ohm is correct, 120 ohms just happens to be the nearest value in the E12 series of resistor values (And is quite close enough). Regards, Dan. Link to comment Share on other sites More sharing options...
HobitLight Posted January 19, 2009 Share Posted January 19, 2009 just reading another thread on DMX cables and it implies that proper cable is 120ohm. is this correct.AFAIA, it doesn't matter whether it's 110ohm or 120ohm as they should both carry the signal fine. Also, both 110 and 120 ohm resistors are used so I don't think it shall matter too much. Of course, I'm no expert at DMX so if any of this is wrong, feel free to correct me! sorry - I know this might have already been covered but I need a fast reply.If it has been covered before, surely it'll be quicker to search for the information yourself than to wait for a reply? :) Link to comment Share on other sites More sharing options...
dbuckley Posted January 19, 2009 Share Posted January 19, 2009 110 ohm cable is fine - Cat5 is 100 ohm and is certified to carry DMX512. Editied to note - two replies before I got mine in - clearly opening a bunch of topics in tabs and working my way along them is far too slow! Link to comment Share on other sites More sharing options...
jcblincs Posted January 19, 2009 Author Share Posted January 19, 2009 [If it has been covered before, surely it'll be quicker to search for the information yourself than to wait for a reply? :) nope. I did a search and couldnt find the exact answer. problem is that searches sometimes bring up info that is nearly right but not quite a specific answer to a specific query !! the other thread about 3pin vs 5pin had some replies that said 120 was the proper stuff so I was a bit confused. jsut about to go and spend up to £1000 of someone elses money on some shiny new kit !!! its exciting !!! Link to comment Share on other sites More sharing options...
boatman Posted January 19, 2009 Share Posted January 19, 2009 ... where can I get a prewired proper 120ohm cable 30m long delivered by wed this week ? I think you should calm down a little. First of all you don't say where you are, if you want a useful reply please fill in your location in your profile. Secondly you don't say how long a cable you need or whether you want 5-pin or 3-pin connectors. If you try using the search function on here and you will find lots of threads about DMX cables and where to buy them. Having said that I'll give you a hint: here's some to get you started and if your username reflects your location as being in Lincolnshire, you're not so far from CPC in Preston that you couldn't drive over and collect them. Link to comment Share on other sites More sharing options...
jcblincs Posted January 19, 2009 Author Share Posted January 19, 2009 ... where can I get a prewired proper 120ohm cable 30m long delivered by wed this week ? I think you should calm down a little. First of all you don't say where you are, if you want a useful reply please fill in your location in your profile. Secondly you don't say how long a cable you need or whether you want 5-pin or 3-pin connectors. If you try using the search function on here and you will find lots of threads about DMX cables and where to buy them. Having said that I'll give you a hint: here's some to get you started and if your username reflects your location as being in Lincolnshire, you're not so far from CPC in Preston that you couldn't drive over and collect them. :) thanks for your help but I think you need to go have a geography lesson !!! preston is about 120 miles and 2.5hrs away. Not all the towns "up north" are near each other !! think reading to portsmouth - about the same distance I reckon !!! I shall complete my details - although I didnt realise this was relevant to getting advice on here. most stuff is bought mail order these days so location is not an issue. I shall now go try your links out - cheers !! Link to comment Share on other sites More sharing options...
johnhuson Posted January 19, 2009 Share Posted January 19, 2009 jsut about to go and spend up to £1000 of someone elses money on some shiny new kit !!! its exciting !!!Yet your latest question in this thread shows you really don't have a grasp of some fairly basic fundamentals of stage lighting. I'd seriously spend some time doing some reading on here and in some books before you go and potentially waste someone else's money. Link to comment Share on other sites More sharing options...
jcblincs Posted January 19, 2009 Author Share Posted January 19, 2009 jsut about to go and spend up to £1000 of someone elses money on some shiny new kit !!! its exciting !!!Yet your latest question in this thread shows you really don't have a grasp of some fairly basic fundamentals of stage lighting. I'd seriously spend some time doing some reading on here and in some books before you go and potentially waste someone else's money. thanks for your opinion but I have spent 3 days trying to learn as much as I can. I am on a tight timescale and came in here for quick pragmatic advice and not comments that tell me I dont have a clue !!! the post you refer to has been answered and I fully understand now. The articles and post on this forum could not help me as nowhere has anyone explained the fundamental difference with LED lights - they need mains power from a fixed 240v supply and then get control via DMX. all other lights that I will use need dimmer pack to control them. Perhaps if this BASIC fact was mentioned in the wiki articles on LED parcans then I would not have had to ask the question. 3 days ago I knew nothing about DMX - I now know enought to do what I want . I know you are probably trying to help me but I think your comment was a bit short !!!I am a fast learner and have a degree in electrical engineering so I am prepared to take a chance that I have enough knowledge. I am sure I will get support on here if I get stuck !!wish me luck !! Link to comment Share on other sites More sharing options...
geek3 Posted January 20, 2009 Share Posted January 20, 2009 It senseless for me to start a new thread for this one question so I will just ask it here. Also I was wondering if I could just directly convert DMX to cat5 Ethernet cable cause I have alot of them. but If I have more of a chance of losing signal with I don't want to use them. Link to comment Share on other sites More sharing options...
Sound In Gloucestershire Posted January 20, 2009 Share Posted January 20, 2009 I am a fast learner and have a degree in electrical engineering so I am prepared to take a chance that I have enough knowledge but will your boss be happy with you taking a chance with his money, that you know enough after 3 days of searching the internet?? Link to comment Share on other sites More sharing options...
boatman Posted January 20, 2009 Share Posted January 20, 2009 . :) thanks for your help but I think you need to go have a geography lesson !!!. .I am on a tight timescale and came in here for quick pragmatic advice and not comments that tell me I dont have a clue !!!. .Perhaps if this BASIC fact was mentioned in the wiki articles on LED parcans then I would not have had to ask the question. . .I know you are probably trying to help me but I think your comment was a bit short !!!. .I am sure I will get support on here if I get stuck !!. With an attitude like you display in all the quotes above? .wish me luck !!. I'll wish you all the luck you can get. Link to comment Share on other sites More sharing options...
Davethsparky Posted January 20, 2009 Share Posted January 20, 2009 thanks for your opinion but I have spent 3 days trying to learn as much as I can. I am on a tight timescale and came in here for quick pragmatic advice and not comments that tell me I dont have a clue !!! You cant have been trying that hard if you haven't sought out a local lighting company and asked them, or visited a library and read some books, or even used good old google, there are plenty of websites which answer the questions which you have asked here. The articles and post on this forum could not help me as nowhere has anyone explained the fundamental difference with LED lights - they need mains power from a fixed 240v supply and then get control via DMX. all other lights that I will use need dimmer pack to control them. Perhaps if this BASIC fact was mentioned in the wiki articles on LED parcans then I would not have had to ask the question. All DMX devices are supplied with hard power and get control data via DMX, so how is this a fundamental difference to the other equipment out there? The wiki is quite clear on how DMX works, are you sure that you read the wiki since some of the other questions you have asked are answered there, ie use of terminators, correct cable and 3 or 5 pin plugs. If you had no knowledge of the subject when you took this job on then surely you only have yourself to blame if you find yourself out of your depth? Surely the company you are getting the equipment from will be able to provide some basic training in the set up and use of the equipment? I am a fast learner and have a degree in electrical engineering so I am prepared to take a chance that I have enough knowledge. Knowledge isn't everything, experience counts for an awful lot too. And the best way to get that experience is to spend some time working with someone who knows what they are doing. Link to comment Share on other sites More sharing options...
Shez Posted January 20, 2009 Share Posted January 20, 2009 I was wondering if I could just directly convert DMX to cat5 Ethernet cable cause I have alot of them. but If I have more of a chance of losing signal with I don't want to use them. Your question is a little ambiguous - CAT5 and ethernet are two entirely different concepts. CAT5 is a type of cable that can be used to carry all manor of signals, including DMX. The BR wiki has more info on this, including a pinout to use. Ethernet is a computer networking technology; it is possible to transmit several universes of DMX over an ethernet network, but requires specialist hardware to do this. Link to comment Share on other sites More sharing options...
mutley Posted January 22, 2009 Share Posted January 22, 2009 110 Ohm is correct, 120 ohms just happens to be the nearest value in the E12 series of resistor values (And is quite close enough).True. In fact, if you are using standard 5% tolerance resistors (gold stripe) the actual measured resistance of a 120 ohm resistor could be less than a 110 ohm resistor! As previously stated, Cat5 cable is "certified" for DMX (which is technically a form of RS485 data), look up DMX in Blue-Room Wiki for full info. Link to comment Share on other sites More sharing options...
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