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Atlas #544099 and #447399 DCC Decoders
5
Atlas Model Railroad Co., Inc.
your DCC system are specified in the user manual of the particular
system that are using. Note: In order for newly programmed CV values
to take effect after service mode programming, the decoder must go
through a power reset. If your DCC command station does not support
automatic power reset, simply rock the locomotive off the track after
programming.
Configuration Variables
Atlas #544099 and #447299 DCC decoders support a range of features,
which are activated by setting configuration variables. All the
configuration variables are numbered. These numbers are used during
programming and are identical for all decoders that conform to the
NMRA standards, independent of the decoder manufacturer. The
following table lists the CVs supported in Atlas VO-1000 DCC decoders.
Both CV numbers and Register numbers are provided for cross-
reference.
Some CVs (such as CV29) have specific meanings for each bit. In
order to conform to the NMRA convention for bit numbering, the bit
assignments shown in this table use the bit-numbering scheme of 0 to 7.
Table 1: Configuration Variables (CVs) for Atlas
#544099 and #447299 DCC decoders
CV Reg. Description Range Default
Value
**
1 1 Short locomotive address:
This is the (2-digit) number used to specify to the
DCC system the locomotive that you wish to run.
1-127 3
2 2 Start voltage:
This is the voltage applied to the motor in speed-
step 1. Set this value so that the locomotive just
starts moving in speed-step 1.
1-15 10
3 3 Acceleration Momentum:
Determines the rate of change of speed upon
acceleration. A higher value leads to a slower
acceleration.
1-31 1
4 4 Brake Momentum:
Determines the rate of change of speed upon
braking. A higher value leads to longer braking
distances.
1-31 1
5 5 Contains CV29 (see definition of CV29 below)
0-39 6