Speed Steps on a decoder

Model Railroader Layouts and layout building
1

Alrighty,

Well as you all know, 99% of the decoders on the market today come preprogrammed for 28/128 speed steps. However, I have a command 2000 dcc system that uses 16/24 speed steps. Is it possible, and if so, how, do I set up a 28/128 decoder to run on a 16/24 system?

2

I’ve never heard of a DCC system that does 16/24 speed steps. It certainly isn’t NMRA compliant. Where did you get that information? Who makes it? Where did you get it?

Here’s a link to and a quote from MRCs web instuctions on their Command 2000 system:

http://www.tttrains.com/mrc/section2.html

excerpt:

Normal mode/Advanced mode:

Command 2000 can program and run two modes, Normal mode and Advanced mode. In normal mode you only have 14 speed steps to control a loco’s speed. In advanced mode you will have 28 steps.

3

As the prior poster noted you probably mean 14/28 system. The answer is yes. The “how” of your question depends on the specific decoder. In its manual will be a section on how to put it into 14 step mode.

From the Digitrax Decode Manual:
6.2 Configuration Register: CV29
6.2.1 Characteristics Controlled by CV29
Configuration Variable 29 (CV29 for short) is a very special CV. The value
entered for this CV controls several things:

  1. 2 digit addressing or 4 digit addressing (as described above
  2. Normal Direction of Travel (NDOT)
  3. Speed step control: Advanced Mode (28/128 speed steps) or Standard
    Mode (14 speed steps)
  4. Analog mode conversion On or Off
  5. Speed table On or Off

Depending on the other things you want it to do will determine the exact value needed.

4

Yeah I meant 14/28 :slight_smile: Anyway thank you for your help. Now I just need to figure out all those CV’s on my system…

5

If possible use the ‘advanced’ mode so it uses 28 speed steps. Then you won;t have to reprogram any decoders.

–Randy