CV 29

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CV 29
Configuration Data #1
Range of Values0-255
Accepted Values0-255
Default Value6 (Varies)

NMRA CV 29 - Configuration Data #1

This CV is used to set up or enable basic functions of your decoder such as direction, speed step modes, enable/disable DC operation, and select the active address type. See the table below for more information on the settings controlled by this CV.

To determine which functions are active, use the table below and combine the values of the functions you would like to have active, and program the sum into CV 29. Fun Fact: TCS also offers a Calculator Tool

CV 29 - Configuration Data #1
Bit Feature Description Default Value
0 Direction This setting controls the locomotive's forward and backward direction in digital mode only.

Direction-sensitive functions, such as the motor and directional headlights will be reversed so that they line up with the locomotive’s new forward direction.

This setting offers a software-level fix if the decoder has been wired backwards, instead of re-wiring the engine.

OFF 1
1 Speed Step Mode
(28/128)
This setting selects the speed step mode used by the decoder. This setting is not affected by your command station's throttle setting.

When enabled, 128 speed step mode is active - the decoder will interpolate 128 speed step mode from 28 speed steps if your command station is not configured for 128 speed step mode.

ON 2
2 Analogue (DC) Operation If this setting is enabled, the decoder will operate when DC power is applied. The functionality of your decoder is based on your DC Mode Settings. ON 4
3 Bi-Directional Communication (RailCom) This setting determines whether the decoder will send or receive information over RailCom. See Bi-Directional Communication Configuration for more details ON 8
4 Disable 3-Point Speed Curve This setting will disable CV 5 and CV 6 for use in the 3-Point Speed Curve when enabled (CV 2 will always be enabled for use) OFF 16
5 Address Type This setting switches the Address Type between 2-digit and 4-digit addressing. When this setting is enabled, the decoder will use a 4-digit "long" address. OFF 32

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