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Atlas #544099 and #447399 DCC Decoders 8
Atlas Model Railroad Co., Inc.
CV Description Range Default
Value
**
51 DCC Function Used to Dim Headlights
The active headlight (front headlight if locomotive
direction is set to forward and rear headlight if
direction set to reverse) may be dimmed by a DCC
function if and only if Function F0 is set to ON and at
least one of the bits of CV51 is set to the binary
value “1.” The DCC function to be used to dim the
headlights is specified by the bit of CV51 (bit 0 to bit
7) that is set to the binary value “1.”
If two or more bits of CV51 are set to binary value
“1,” all DCC functions corresponding to those bits set
to “1” can be used to dim the headlight. To avoid
unneeded use of DCC functions, it is recommended
that only one bit in CV51 be set to “1.”
The amount of headlight dimming is determined by
the value in CV52.
0-255 0
Bit 0
CV51.0=1: Function F1 controls dimming
0,1 0
(1)
Bit 1
CV51.1=1: Function F2 controls dimming.
0,1 0
(2)
Bit 2
CV51.2=1: Function F3 controls headlight
dimming
0,1 0
(4)
Bit 3
CV51.3=1: Function F4 controls headlight
dimming
0,1 0
(8)
Bit 4
CV51.4=1: Function F5 controls headlight
dimming
0,1 0
(16)
Bit 5
CV51.5=1: Function F6 controls headlight
dimming
0,1 0
(32)
Bit 6
CV51.6=1: Function F7 controls headlight
dimming
0,1 0
(64)
Bit 7 CV51.7=1: Function F8 controls headlight
dimming
0,1 0
(128)
52 Amount of Headlight Dimming.
For noticeable headlight dimming, CV52 should be
set to a mid-range value, such as decimal 64.
Using the value 0 for this CV results in a completely
dark headlight when the headlight is dimmed.
Using the decimal value of 255 for this CV results in
no difference is brightness between a dimmed and a
non-dimmed headlight.
0-255 255
* The notation CVx.y = z means that bit y of CVx has the value z. For
example, CV29.2 = 0 means that bit 2 of CV29 has the value ”0.”
** In the Default Value field, the numbers shown in parenthesis () are the
decimal values that must be written into a CV for the specified bit of that
CV to have the value “1.”