Motor voltage CVs in Massoth eMotion S sound only decoder?

Beddhist

Motorcycle travel, trains
Country flag
Hi,

I have been studying my sound decoder's manual. Most is pretty clear to me, but I don't understand why they list CVs 2 to 6, which are for Motor control. The manual doesn't actually deal with these, but they are in the list in the appendix. Is this an error, or do they actually do something?
 
In order to align the sound with the running characteristics you can alter these values. Take CV2 as an example, if the value in the driving decoder is different than in the S decoder the loco will start moving with delayed or premature start of sound.
 
Thanks for the explanation. So, even if my decoders are from 2 different manufacturers I just change these CVs in both decoders at the same time, keeping them in sync?
 
You will probably have to alter each independently, as the 'voltage to speed-step' ratios may be different in each manufacturers decoder.
The start voltage will also be (partially) dependent on the load on the loco.. Light engine will move for less input than a formation of several coaches / wagons.
 
I see. I wonder why there is nothing about this in the manual at all? First testing has shown that the two decoders ARE out of sync: the loco doesn't start moving until speed step 2 or 3, but the engine revs up at step one.

Must ask about that in the Massoth forum, if/when they approve my account...
 
Of course, the only way to *really* get a steam model 'in sync' is to use a trigger on one of the axles..

All other methods, be it speed-step, or voltage dependent will always be a 'best effort'..
 
No problem then: it's a diesel.
 
Could it be to help adjust the sound when analogue running.?
 
Beddhist said:
I see. I wonder why there is nothing about this in the manual at all? First testing has shown that the two decoders ARE out of sync: the loco doesn't start moving until speed step 2 or 3, but the engine revs up at step one.

Must ask about that in the Massoth forum, if/when they approve my account...
Increase CV2 for the driving decoder only until the locomotive starts moving at speed step 1. You will have to program the driving decoder seperately from the sound decoder, this is also the recommeded way of programming a multiple decoder set-up to ensure proper programming.
 
Hmmm, yes ... that will have to happen before the body goes back on. After that the sound decoder is inaccessible. I think I will have to keep track of all the changes I make, as Airwire will not read CVs.
 
I thought about this some more and it's making less sense now: the sound decoder has nothing to do with motor voltage. There is no connection. It gets the speed steps from the DCC signal and the sound is adjusted accordingly. That is how I understand it.

Now, off to the Massoth forum...
 
Beddhist said:
I thought about this some more and it's making less sense now: the sound decoder has nothing to do with motor voltage. There is no connection. It gets the speed steps from the DCC signal and the sound is adjusted accordingly. That is how I understand it.

Now, off to the Massoth forum...
Depends on the make of decoder, and how this is implemented..
Also, if running analogue, there are no 'speed-steps', as such.*

*Though the decoder 'might' generate them internally to then drive the system, but I would doubt it.
 
Beddhist said:
Hi,

I have been studying my sound decoder's manual. Most is pretty clear to me, but I don't understand why they list CVs 2 to 6, which are for Motor control. The manual doesn't actually deal with these, but they are in the list in the appendix. Is this an error, or do they actually do something?

How have you connected your Massoth S to your main driving decoder?

If you have just connected it in parallel with motor decoder by connecting it to the track then what has been said in this thread so far is true and CVs 2 to 6 do make a difference. If you have connected it in what Massoth describe as the 'optimum' way via the SUSI interface then these CVs (and some others) are not relevant.

Another advantage of connecting via SUSI is that the main driving decoder and the Massoth S look like one sound decoder and so you do not have any problems programming when everything is installed.
 
Another advantage of connecting via SUSI is that the main driving decoder and the Massoth S look like one sound decoder and so you do not have any problems programming when everything is installed.

Unless CV numbers, but not function, are common between the two decoders.
 
Beddhist said:
I thought about this some more and it's making less sense now: the sound decoder has nothing to do with motor voltage. There is no connection. It gets the speed steps from the DCC signal and the sound is adjusted accordingly. That is how I understand it.

Yes but, assuming your Massoth S is connected in parallel with your motor decoder, the speed steps don't define the actual speed the engine runs at, and when it starts. If you think about some of your other engines say speed step 28 drives different engines at different speeds. The sound decoder does not know how 'fast' to drive the sound if it doesn't also have the other CV info. Hope that helps.
 
Cliff George said:
They are not. The SUSI CV range is from 940 onwards in the Massoth S.
Yes, but we have not been told what the 'S' is in, and what make the driving decoder, if any, is..
 
The driving decoder is an Airwire G3. DCC arrives over the air and the G3 has a "DCC out" socket to which the S is connected. That probably qualifies for a "parallel" connection of sorts. There is no SUSI on the G3 and there are no track pickups in the loco any more, since a battery is being installed.
 
Back
Top Bottom