The list on page 34 includes ALL F functions that an MTH PS3 engine could
have. You are free to change any of the above listed items to any F function
position, 1-28. For example, if you your engine came from the factory without a
smoke unit but you added one at a later date you could swap out any of the F
functions, 1-28, for the Smoke On/Off and the Smoke Volume.
So, using the example of moving F18 (Extended Shut Down) to F28 (Feature
Reset) here are the steps:
1. Refer the MTH Supported CV table to see what CV the destination
Function is assigned to. In doing so, you are looking only for the Low
Byte CV location. In this case it's CV170
2. Using your DCC system, bring up CV programming for CV170
3. Now tell the engine which F-Function you want to write at CV170. So,
looking at the Function ID table above you can see that Extended Shut
Down is a value of 21
4. Using your DCC system, enter a value of 21 for CV170 and hit Enter.
You have just re-assigned the Extended Shut Down sound to F28 on your
DCC controller. The engine will give you a two horn blast indication.
Note – You've also left an empty location where Extended Shut Down
used to be (F13)
5. Now you can fill that location with whichever CV you'd like. For this
example we are just going to move the Train wreck up to F18 (we're just
swapping F18 and F28)
6. Since F18's Low Byte is CV150 then bring up CV programming for
CV150
7. Now tell the engine which F-Function you want to write at CV150. So,
looking at the Function ID table above you can see that Cab Chatter is a
value of 29
8. Using your DCC system, enter a value of 29 for CV150 and hit Enter.
Your engine will give you a two horn blast indication
Custom Speed tables
Below is a table that shows the value to write to CV25 to achieve the desired speed
curve. For example, if you would like to use speed curve 18 then:
1. Write a value of 1 to CV52 to enable PWM Mode
2. Write a value of 1 to bit 4 of CV29
3. Write a value of 18 to CV25. Your engine will now use the speed curve
#18 below
4. If you want to create your own speed table using CV's 67-94 then write a
value of 0 or 1 to Cv25
M.T.H. HO S 3/6 Steam Engine
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