M.T.H. HO 4-6-6-4 Challenger Engineer's Manual page 34

Setting Up CV21 for a Consist
Cv21 allows you to set which F Functions you want the consist address to control.
For example, you will likely want all of your MTH consist engines to respond to
Start-Up/Shut Down (F3). Please refer to the table below to see which bits have
what decimal value and which F Function they correspond to.
To do this:
1. Call up the Front engine on your DCC system
2. To set the Front engine to respond to the Bell (F1), Horn (F2), Start-Up/Shut
Down (F3) and Front Coupler (F7) you will want to write a value of 71 to CV21.
This is setting bits 0, 1, 2, and 6 ON.
a. CV21's bits are shown in the table below – the decimal value is shown
in parenthesis:
Bit
(Decimal 7 (128)
Value)
F
F8
Function
NOTE - CV21 is ONLY used when you have some value other than 0
written to CV19. If CV19 = 0 then the values of CV21, CV22, CV23, and
CV24 are not used
1. Call up your Middle engine (address 2 in the example)
2. Since you want to have the Middle engine respond to F3 only then write a
value of 4 (CV21, bit 2 = ON)
3. Call up your Rear engine (address 3 in the example)
4. Since you want to have the Rear engine respond to the Start-Up/Shut
Down (F3) and Rear Coupler (F8) functions you want to write a value of
132 to CV21
Your engines are now set up according to the example above.
You will note that there is no F0 in CV21. This is because that function (FL) is
controlled by CV22. Please refer to the Advanced Consisting section for more
information regarding CV22.
6 (64)
5 (32)
F7 F6
M.T.H. HO 4-6-6-4 Challenger Steam Engine
4 (16) 3 (8)
F5 F4
34
2 (4) 1 (2)
F3 F2
0 (1)
F1