The above Ad will no longer appear after you Sign Up for Free!

Terminator, DMX

Discussion in 'Wiki' started by derekleffew, Sep 5, 2008.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

    Messages:
    4,506
    Likes Received:
    2,925
    Location:
    Las Vegas, NV, USA
    A male XLR connector, either 3- or 5-pin, with a 120Ω, 1/2 - 2W (See Note1 below), resistor soldered across pins 2 & 3, plugged into the output of the last DMX device in the line. Easily built oneself (see http://www.bigclive.com/dmxtest.htm), or available for purchase from many manufacturers, one example: DFD Base Model, or (a fancy one with a "DMX-signal present" LED indicator: DFD Deluxe Terminator).

    The terminator is required to prevent reflections from causing data transmission errors on all DMX streams, except those ending with an ETC Source Four Revolution® or SmartPack, which cleverly switch in the resistor if they sense nothing plugged into their DMX out port. See also this thread: http://www.controlbooth.com/forums/l...tion-plug.html.

    For more information, see the "Dr. DMX" article, Why Terminate?.

    Steps to build one's own:

    1) Obtain a 1/2W, 120Ω resistor. (Available from any quality electronics component dealer: Allied, DigiKey, Mouser, Newark, etc.; or from The Shack, Cat#271-1108, $0.99 for a five-pack.)
    2) Solder the resistor between pins 2&3 of a Male XLR (5-pin or 3-pin as appropriate) connector. Polarity of the resistor is not important--it doesn't matter which end goes to which pin. Leave pin #1 empty (no connection).
    [​IMG]
    DL's Photobucket
    3) Reassemble the connector and LABEL IT CLEARLY, as it will look just like an un-wired male XLR connector otherwise.

    Note1: The wattage of the resistor used is often an area of confusion. From Doug Fleenor:
     
    Last edited: Jul 3, 2010

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice