Spoofing a Legacy smoke unit?

Maybe change the R4LC code?

Would that change the RCMC behavior?

I still need the smoke circuit to deliver power.  I just want it to think that everything is ok with the fan motor and smoke resistor;  I was hoping a couple of resistors could do the trick. 

And how exactly would you modify the code? Lionel can, we can’t. I would guess you need some sort of load on the smoke unit outputs like a resistor

Matt Makens posted:

And how exactly would you modify the code? Lionel can, we can’t. I would guess you need some sort of load on the smoke unit outputs like a resistor

I meant the feature code. Can you set it up for a mars light vs a smoke unit by using a different code when resetting the R4LC? There is a list of the codes floating around. Similar to when you are setting the feature code on a ERR product.

The Legacy RCMC doesn't use feature codes. 

John, do you know what the RCMC tests for when it activates the smoke unit?

I believe it's checking for the current draw of the smoke resistor.  You might try a fairly high value like 100 ohms across it and see if that makes it happy.