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March 15, 2011 - In December 2010, M.T.H. Electric Trains released a new Rev. L Track Interface Unit (TIU) that significantly improves DCS signal strength on many layouts. However, a small issue has surfaced recently that may cause some Rev. L TIUs to malfunction.

The malfunction affects accessory (ACC) ports 1-6 of any Accessory Interface Unit (AIU) connected to an affected Rev. L TIU and causes the DCS Remote to be unable to activate Accessory (ACC) Ports 1-6. All AIU switch track (SW) ports and ACC ports 7-10 are unaffected. If your Rev. L TIU has this problem, please see the 3-step solution below.

  • The first step is to download the correction TIU software update by clicking here.
  • The second step is to install the correction software update onto the Rev. L TIU using the DCS Loader Program 2.20, just as you would when loading any software update into a TIU. After installing the correction software, cycle power on and off to the TIU.
  • The third and final step is to immediately reinstall DCS 4.20 onto the Rev. L TIU using the DCS Loader Program 2.20.

    If you are unable to load DCS software or have some reservations in doing so, M.T.H. recommends that you contact M.T.H. Technical Support at 410-381-2580 (M-F, 12:00pm to 5:00pm EST).