Changing the value of CV116 can essentially accomplish the same thing as CV113, but CV116 is more than an Engine Auto Start feature.
Soundtraxx titles CV116 on its Tsunami diesel decoders as “Engine Exhaust Control”. Besides auto start, CV116 affects engine notch rate and dynamic braking.
The default value for CV116 is 39. As a result, the prime mover starts up when power is supplied to the track and the engine RPMs increase every 7 speed steps. So, to enable the prime mover to start up at speed step 1, auto start must be disabled by subtracting a value of 32, resulting in a CV value of 7. Further changes to the value of CV116 will affect the performance of engine RPMs and the dynamic braking feature.
I believe that what the OP is interested in doing is simply preventing sound at power up, and that can be accomplished by changing the value of CV113. Then,sounds become active only when the decoder is addressed. When the value of CV113 is changed from its default value of zero, the sound effects will turn off automatically after the timeout period has elapsed but only when the locomotive has been stopped and all functions have been turned off.
The Op stated that “I idealy want the start up sequence when I first select the engine”. If you are not using manual notching then setting the rpm interlock which changes CV 116 only keeps the engine from moving when it is powered up. As mentioned previously if the tsunami has been shut down using the emergency stop button when the engine is in nuetral then going to step one on the throttle and back will trigger the start up sequence. If the tsunami was not shut down using the emergency stop button the sound will come on without the start up sequence when the throttle is toggled. At least that is what I found while experimenting late last night.
As an additional note, I have set the dynamic brake to operate independently of rpm so I will plead ignorance on what effect the above changes to CV 116 would have on braking.
Shutting the power to the rails off without going through the shut-down sequence, the decoder is basically still stuck in the idle loop. When track power is restored and the decoder is called, the file will pick back up where it left off - in the idle loop.
I prefer utilizing CV116 as opposed to CV113, as there may be times when the engine is sitting idle for some reason, and I don’t want it to time out and shut down. I prefer to have full manual control over when an engine starts up and shuts down. There are many times a local may have to wait for a good deal of time before he can proceed with his job … really wouldn’t want the engine to time out and shut down …
As I understand it, and as someone mentioned above, all functions have to be off before the loco will complete the “go quiet” mode. So, if you leave the headlight on the loco should continue to sit at idle indefinitely.
I’m confused. Are you saying that with a certain setting in CV 116 the tsunami locomotive will not shut down until you push the emergency stop even if all functions (lights) are off and CV 113 is greater than zero? Or does CV 113 have to be set to zero to get the effect you are talking about?
Oddly, on my powercab I’ve found it to do that for the first press of emergency stop, any other further pressing just causes the non scramed loco’s to halt and resume. The decoders I use come from DCC Concepts and so far I’ve had little issue with them.