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Reply to "Watchdog Signal"

Maybe I am missing something, but if I have a dedicated handle on my Z4000 for just yard tracks, how can the engine take off at full speed if I hit the toggle to allow power to the track then slowly apply power to the track?  I guess for my method to work, a new watchdog signal has to be sent when I take the handle down to zero and then back to 18 volts.  Is the watchdog signal only sent when the transformer is first powered up or is a new watchdog signal sent when the voltage goes to zero then back to 18 volts?

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