DCC Bit Value Decoder
Example Value (bit 7 -> bit 0) 11011001
Bit
(Decimal
Value)
7(128) 6(64) 5(32) 4(16)
3(8)
2(4)
1(2)
0(1)
Binary
Example
1(on) 1(on) 0(off) 1(on) 1(on) 0(off) 0(off) 1(on)
Decimal
Value
128
64
0
16
8
0
0
1
So, in the above example you simply add up the values in the
“Decimal Value” row – 128+64+0+16+8 +0+0+1 = 217. You would
write 217 to the CV you were altering.
The above applies to any CV. Also, if you have a CV that already
has a value assigned that you do not want to alter but need to
make additions to it, for example CV29, you would simply add the
additional bits you enabled to the existing value to obtain the new
CV value.
For example, if you had a consist address (CV19) set to 5 and you
wanted to alter this to show an engine reversed in the consist you
would need to set bit 7 (decimal value = 128) for the engine you
want to reverse. To do this - take 128 (the new bit you want to set)
+ 5 (the existing bit that you do not want to alter) = 133. You would
then write a value of 133 to CV19.
Premier 2-4-1A Mountain Steam Locomotive
29
