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CV29 - A Special CV With Interesting Options
If you program the locomotive address from the programming track, CV29 is
automatically programmed for you at the same time as the loco address is programed
into the decoder. You do not have to program CV29 unless you want to make a change
that is different from what is normally used when programming a locomotive address.
CV29 lets you setup various decoder functions and features. CV29 controls the following
decoder functions: analog mode conversion, motor direction, number of speed steps in use and
the speed table to be used. Below is a description of each with the corresponding bit number next
to the feature. More on this later.
Motor Direction [Bit 0]: The default “normal” means the motor will turn in the forward
direction when the throttle is sending forward speed commands. However, if you accidentally
reversed the motor wires during decoder installation, the motor will run in reverse. CV29
provides an easy way to electronically reverse the motor wires – no need to tear apart the
locomotive.
# of Speed Steps {Bit 1]: Many decoders allow you to program either 14 or 28 speed steps. This
setting is ignored if using 128 speed steps. Be careful! Some decoders do not support 128 speed
steps. For these decoders, you'll have to settle for just 14 or 28. You do not have to program CV29
to use 128 speed steps. Also see page for information about setting the 128 speed step option.
Analog Mode Conversion [Bit 2]: For best decoder performance, we strongly suggest that this
mode be disabled. If you don’t disable this mode, the decoder may lurch or run when system
power is first turned on. When a decoder has analog conversion disabled, it will only respond to
throttle commands with correct DCC signals. If no DCC is present, the decoder will not move
even if there is 12 volts DC on the rails.
Speed Table {Bit 4]: Your decoder may support a default speed table and a user programmable
speed table. This entry tells the decoder which to use. Be careful! Most alternate speed tables are
blank until you load them. Do not enable this feature without first loading the speed table.
Starting on page are several methods for creating and using custom speed tables.
Long Address [Bit 5]: This bit controls whether a long or short address is in use. For EasyDCC, a
short addresses are in the range of 01 to 99. Long addresses are in the range of 100 to 9999.
The remaining bit numbers of CV29(8, 64, and 128) are reserved for future use.
By loading specific values into CV29, you enable or disable these features. Be sure to check
your decoder manual to verify which features are available. You can not harm a decoder with an
incorrect value. However, it may not operate as expected.
The table on the next page shows CV29 values and what the value does for decoder features and
functions.
Some decoder manuals use the hexadecimal numbering system. You must convert the
hexadecimal value to a standard decimal value to use with EasyDCC.
CV29 Bit Number
CV29 Bit Value
7 6 5 4 3 2 1
1
0
0 0 0 0 0 00
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