Speed Step Control-14 or 28/128

Most modern command stations and decoders are set up to run 28/128 speed steps.  If you are using older command stations or decoders you may need to adjust one or the other to get the trains to run.Why are more speed steps better?The reason you want to use a command station and decoders with 128 speed steps is for smoother speed control of your locomotives.   Digital command control signals are just that, digital.  When you send speed commands with your throttle, you are sending digital instructions telling the decoder to change from the current speed to a different speed.  When ...

Your locomotives look like the real thing, Digitrax LocoMotion™ System makes them run like the real thing, too!   128 speed step control.   Smooth deceleration to stop before changing direction when locomotive is reversed. No sudden, non-prototypical stops!   Torque compensation for the smoothest operation ever.   Momentum with acceleration and deceleration settings.   Set normal direction of travel for your loco.   Switching speed feature for quick access to slower switching speeds.   Simple 3 step speed tables are easy to set up.   Advanced 28 step speed tables with 256 level resolution.   Scaleable speed stabilization feature. ...

CV29 is also called the Configuration Register.  It is a special CV that handles several different aspects of locomotive behavior.Characteristics Controlled by CV29:1.     Speed Step Control:  Advanced Mode (28/128 speed steps) or Standard Mode (14 speed steps).2.     Speed Tables: On or Off3.     Analog mode conversion: On or Off4.     Normal Direction of Travel (NDOT)5.     2 or 4 Digit Address selectionDetermining CV Value To Program Into CV29The numerical value value you will program into CV29 will affect many important decoder characteristics.  Each of these characteristics is controlled by a "software switch." This switch is either on or off depending on the CV ...

  CV29 is assigned a single value which chooses a combination of specific effects: 1. Speed step control. 2. Speed table On or Off. 3. Analog mode conversion On or Off. 4. Normal Direction of Travel (NDOT). 5. 2 digit addressing or 4 digit addressing. Speed Step Control. There are two modes for speed step control: Standard (14 speed step mode) and Advanced (28/128 speed step control). Because of differences in the capabilities of DCC compatible command stations and decoders, you may have to set CV29 in your decoders to different values to match the mode of the command station ...

CV29 is called the configuration register. It controls the following decoder characteristics: 1.  Whether the decoder uses 14 speed steps, 28/128 speed steps or loadable speed tables.  This affects how smoothly the loco will move and how it responds to throttle controls.2.  Whether the decoder automatically converts to analog mode when no DCC signal is present.  This allows the decoder to operate on a DC layout even though it is DCC equipped.3.  Defines the normal direction of travel for the locomotive. Normal Direction of Travel or NDOT can be changed when the motor connections of decoder have not been connected so that the locomotive runs ...

Throttle Option 2Throttle Default Decoder Status 128/28/14 speed steps Each DT402/DT400 can be set up to operate new decoders selected by that throttle as any decoder status code you choose. New decoders are defined as decoders that have not been selected in your system. Your throttle's default setting is to operate decoders that are 128 speed step capable, so when a new decoder is selected the throttle automaticaly assumse that all decoders selected are that 128 speed steps. If you operate mostly decoders that are only able to recognize 28 speed steps, you can change this setting.Tetherless Operation Mode Each throttle can be set up with radio ...

A speed table is a list of numbers, one number for each speed step. Many operators customize their locomotives by adjusting the CV's for Vstart (02), Vmid (06) and Vmax (05) to set the throttle response characteristics for each locomotive. This is known as a three-step speed table It is also possible to create a more complex speed table, either with 14 or 28 steps that specify the exact percentage of full power sent to the motor when the throttle is set to that speed. Speed tables can be set up for 14 or 28 speed steps, but not for ...

The Digitrax DCS50 Zephyr is set at the factory to send 128 speed step commands to all mobile decoders.If you have a non-Digitrax decoder that can’t run in 128 speed step mode, you can change the number of speed steps the DCS50 sends to that decoder so that you will be able to control the decoder. This is called status editing the decoder. When you status edit a decoder, the DCS50 will send a different format to that specific decoder address without affecting the 128 speed step operation of Digitrax decoders and other 128 speed step decoders on the railroad.NOTE: ...

Q: I have a Digitrax DT400 throttle. The left speed knob accelerates the locos at one speed unit per "click". However the right knob accelerates at three speed units per "click". How can I change the right knob to one unit per click? There is not a way to change the clicks to one per unit. Each rotation of a throttle knob on the DT400 series throttle generates 24 clicks.  Digitrax supports 14, 28 and 128 speed step operation in decoders; each click on a DT400 series throttle knob is related proportianally to the number of speed steps used by the decoder. So, for a ...