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Thread: Protocol: RDM (configuration via DMX)

  1. #1
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    Default Protocol: RDM (configuration via DMX)

    DMX is a single direction protocol for setting dimmer levels. RDM however is a bidirectional protocol that allows communication with remote DMX devices. RDM is able to set properties like starting address from a remote location; you never need to set dip switches.

    Nice summary with resources:
    http://www.rdmprotocol.org

    This document gives a pretty good description of what RDM is:
    http://www.artisticlicence.com/WebSi...appnote005.pdf

    The standard can be purchased from ESTA.
    RDM E1.20
    Last edited by DynamoBen; 04-15-2013 at 10:16 AM.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  2. #2
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    Default Re: RDM (configuration via DMX)

    RDM Enable the Open DMX USB

    After chatting with Henne here:
    http://www.doityourselfchristmas.com...ead.php?t=3479

    We discovered that with a minor modification the Open DMX USB can communicate with RDM enabled DMX devices. This opens up a world of possibilities for us. Like remote start address setting, Firmware Updates via DMX, and remote device status. See the sticky titled “RDM” for a more in-depth explanation of what’s possible.

    What you will need:

    X-acto Knife
    Mod Wire
    Fine tip Soldering Iron
    Enttec OpenDMX USB schematic

    NOTE: This will void your warranty, and could damage your device if not done properly. Perform this mod at your own risk.

    To enable RDM you will need to cut a trace between the SP485CN and FT232BM (RTS). Once cut a jumper wire will need to be soldered between the SP485CN and FT232BM (TXDEN). Take a look at the schematic and device prior to starting this mod to be sure you understand what this mod entails.

    Steps:

    1. Locate the FT232BM and SP485.
    2. Find the trace between the FT232BM pin 23 (RTS) and SP485CN pins 2 & 3 (RE & DE).
    3. Cut the trace between these two ICs and verify there is no longer continuity.
    4. Find pin 16 on the FT232BM (TXDEN).
    5. Solder a mod wire between the FT232BN pin 16 and the SP485 pins 2 & 3.

    Testing:

    Launch Vixen, or the Enttec test app, and ensure DMX-out is working. If you have another DMX transmitting device now is a good time to test DMX-in using the Enttec app.

    Next go here and download the Open RDM software:
    http://www.hoelscher-hi.de/hendrik/english/openrdm.htm

    Connect the OpenDMX USB to a RDM enabled DMX device and try to manipulate the devices parameters via OpenRDM. It works!!!

    Happy RDMing.
    Last edited by DynamoBen; 09-17-2012 at 11:38 PM.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

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