I have some DSXs that run with various motor decoders. True, the sound does ramp up/down with the throttle, but too fast. (that is, the DSX reaches max momentum before the loco) The DSX ramps up too fast.
I have been told that,
"The final thing to synchronize the DSX with your motor decoder is to adjust the momentum to match that of the motor decoder."
Just how do I do this if the decoder has no CV 3, 4, 2,5,6, or speed tables available?
Thanks.
I don't think there's any way to adjust the DSX because, as you already know, it has no momentum CVs. I have a steam version in an HO engine that starts chuffing like mad before the engine has even begun to move, so I stopped using DSX decoders.
Thanks fellows,
Now I have been able to set the ramp up to a slower speed just by guess and by golly using the CV 58 that you have suggested, Dave.
However, a few corrections. CV 30 is really the CV for factory reset of defaults....not rpm interlock. However, using Decoder Pro I was able to simply set this to enabled.
Now I just tried entering values for CV 58 and found that V58=14 gave a good result. One cannot just enter any old value in this experimentation because the value relate to HEX numbers and some just don't work.
So can anyone tell me if the CV 58 = 14 is really a value of 00001110 as shown in the table?
And then what other values could I enter to experiment. The default is 23 which is 00010111. I am no good at figuring these tables out. I would like to know what other numbers I might try entering.
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The alllowed values are 0-31. 0 disables RPM interlock and Auto Notching. 1-15 disables RPM interlock and enables Auto Notching, and the number that you program is the number of speed steps per throttle notch. 16 enables RPM interlock and disables Auto Notching. 17 - 31 enables RPM interlock and Auto Notching, and subtract 16 from the number you program to get the number of speed steps per throttle notch. As a side note, the documentation that you got with the decoder may be different, but if you download the DSX documentation from the Soundtraxx website, it does show the DSX decoders as supporting CV3 and 4.
To convert the binary: (ok this might not line up properly but I'll try)
.0.....0.....0.....0.....1.....1.....1.....0
128..64...32...16.....8......4....2.....1
Just add up the numbers where there's a 1. So 00001110 does indeed = 14. Sme goes when calculating things liek CV 29 values. Bit 7 is on the left, bit 0 in on the right. Write it down putting a 1 where you need a 1 and a 0 where you need a 0, then add up the decimal numbers for each position it that has a 1 - and there's your value for CV29.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
The DSX decoders do support momentum settings. If you look at the SoundTraxx web site their technical reference manuals apply to both DSD and DSX decoders.
In order to program the DSX separately from the motor control decoder, you will have to lock the motor decoder or both will be programmed at the same time.
In your other post about the DSX having "hidden" CVs, I think that Decoder Pro is wrong in not including all of the CVs that are actually in it.
Hey, thanks very much you guys. That explains a lot. (How do you guys know this stuff? Thanks rrinker and CSXRobert for the detailed answer. And thanks cacole for responding to all my recent posts. )
I don't know why, but these manuals seem a big learning curve for me sometimes. I guess I am just getting old and when reading the manuals I get a little confused. Perhaps dyslexic a little I am .
In the same frame of reference, I think I understand that autonotching is allowing the command station to ramp up the throttle at particular points as opposed to using a function key to do it manually---but what is RPM interlock?
I will be using autonotching, should I use RPM interlock or not?