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Reply to "Legacy - TMCC Mode or Cab1 Mode for TMCC engines"

Originally Posted by gunrunnerjohn:

Well, absolute speed commands are just that, absolute.  If you see a 16 in the speed setting for TMCC or Legacy mode, a given engine will have the same speed command and, given the same environment, should run at the same speed. 

 

Relative commands are just an increment or decrement to the current speed step that the engine is running at.  There is no sense of an absolute speed setting.

 

Try this and you'll see the difference.

 

For TMCC or Legacy settings in the remote, with a compatible locomotive, run the speed up to a mid-range value.  As the engine is running, turn off the power.  Turn the power back on and just move the throttle one step.  The engine will take off at the set speed again.

 

Now, using the CAB1 or R100 modes, do the same test.  When you turn the power back on and go one click on the throttle, the engine will be at dead slow, as it's taking one speed step relative to the current setting, which is zero.

John,  I do understand the difference between absolute and relative speed steps.  It is the clarification of what is best for what system and what reason.  Pete tried to make it sound like motor driver specific, yet Lionel clearly states several modes for the same hardware.  So why one over the other (besides relative versus absolute).  What I alluded too, which Norm seems to support is that even the motor Drive boards have different modes available so that may impact performance.

 

I guess it would be nice to have Lionel come out with a more technical description of the pros and cons of the modes and how to apply them to the various Lionel products.  G

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