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Is it possible to send DMX over a TRS 1/4" ?

Discussion in 'Lighting and Electrics' started by koimystic, Nov 12, 2008.

  1. koimystic

    koimystic Member

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    I have 2 scanners that have a 1/4" input and output. It clearly states that they are DMX. I would assume that it would have to be a tip ring sleeve (TRS)? Would a manufacture do that? They are KLS SE204's that were in my youth room and broken. I asked if I could take them home and fix them, so I am in the process of fixing an extremely old scanner that I don't have any documentation. Lol. Thanks for the help!
     
  2. dannyn

    dannyn Member

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    I have seen applications like what you are speaking of. Usually they have that, then they have a DMX add on box sold seperately. That is the way I saw it on a few products at LDI.
     
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  3. koimystic

    koimystic Member

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  4. Van

    Van CBMod CB Mods Premium Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    I have to say I've never seen DMX sent through a TRS connector, Are you sure it's not just and Audio IN/OUT ? A picture of the innards would be great, one could easily determine if they connectors go to an audio input or DMX decoder daughter board.
     
  5. avkid

    avkid Not a New User Fight Leukemia

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    It seems possible from a conceptual point of view.
    they do have 3 conductors.

    Highly unlikely though.
     
  6. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    It's POSSIBLE to send DMX over barbed wire, but I've never seen it used with 1/4" TRS connectors. (And wouldn't use a device that did.)
     
  7. elite1trek

    elite1trek Active Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?


    I sent DMX through a snake once, but that was in a pinch. As for a TRS connector, I don't know why a manufacturer would do that when they could do a 3 pin XLR, or a 5 pin for that matter. Space Maybe?
     
  8. gafftaper

    gafftaper Senior Team Senior Team Fight Leukemia

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    You could possibly do it but it would be highly unadvised. The likelihood of a failure is high. The wire is not high enough quality to maintain a good signal. There are other possible problems as well. If you aren't worried about how the show looks go for it but I wouldn't do it.
     
  9. Van

    Van CBMod CB Mods Premium Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    I have to say I've never seen DMX sent through a TRS connector, Are you sure it's not just and Audio IN/OUT ? A picture of the innards would be great, one could easily determine if they connectors go to an audio input or DMX decoder daughter board.
     
  10. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    [user]Van[/user], is there a one-hour and seven-minute echo where you are? Maybe it's due to the capacitance of the wire of your Internets? Are you not meeting the RS-485 specifications?:)
     
  11. Van

    Van CBMod CB Mods Premium Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    I think it's IE8 Beta,
    I sent the message and waited and waited and waited, and waited, then I had to go fix something in the theatre, < tech week, you know> when I came back the icon wasn't spinning anymore but I was still on the "reply to thread " page. Weird. 'course you're right, it could be a reflection off of a bad connector on my opto-coupler, causing a slight variance in the timing of the flugal valve. I'll recalibrate my Heisenberg compensator and see if that doesn't resolve the issues of feedback in my positronic matrix. ...... Or something like that :rolleyes::twisted:


    < and my google task bar / spell check thingy doesn't work with IE8 Beta either so I'm actually having to use my brain to spell with, yuck>
     
  12. STEVETERRY

    STEVETERRY Well-Known Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    Hey, that's my line!

    ST
     
  13. dramatech

    dramatech Well-Known Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    In the link that you provided, it mentioned the model with an XLR connector. It is possible that you have an older model and that they used TRS connectors when they started out, and saw the error in their ways, later changing to XLR.
    You say that you have already opened it up, well go one further. Follow the wires from the TRS conector to the PC board and then follow the traces on the board probably thru some very low resistance resistors, and see if the first Integrated circuit that it comes to is a 75176. This is the most common transceiver chip used in RS-485, the electrical protocall used by DMX-512.
    Hey have fun with the thing, it is already discarded, what can you lose, and it might be an educational experience for you.
     
  14. TimMiller

    TimMiller Well-Known Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    So does anyone remember the old HES data flash? They used LWR protocol, which is another type of RS485 data. They had 1/4" in and outs but then realized what a PITA it was having a bunch of 1/4" to XLR adapters.
     
  15. len

    len Well-Known Member

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    Re: Is it possible to send DMX over a TRS 1/4%26quot%3B ?

    Based on past experience, manufacturers will do anything to get product on the street. I suppose it's possible to send dmx that way. I guess the easy thing to do would be to build an adapter and find out. Worst case you got some soldering practice in.
     
  16. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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