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Turn DC mode off - CV29 - DCC - Tutorials - Getting You Started. - Your Model Railway Club
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 Posted: Thu Aug 21st, 2014 03:09 pm
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Ed
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Having just altered the normal direction of  travel by changing the value of CV29 for the second time (I really must check which way round I'm soldering these wires), I was wondering what everyone does about changing the value to disable running the decoder in DC mode.

The default appears to be on, so that a chipped loco could be run on a DC layout.

However I have read that turning it off can improve running especially when the track is a bit dirty as it stops the decoder checking for DC and instead makes it look again for the DCC signal.

Since I have no intention of running any chipped Loco on DC, I was just wondering what everyone else does as I'm thing of disabling DC as I chip each loco by subtracting 4 from the value.


Ed



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 Posted: Thu Aug 21st, 2014 03:45 pm
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RFS
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Turning off running on DC can prevent cases of runaway when the decoder temporarily loses the DCC signal.  A good explanation of why this happens is described here:-

http://www.tonystrains.com/tonystips/2011/032211.htm

I turn off both DC running and Railcom on all my locos.  As all locos use 4-digit addresses, all use 28/128 speed steps and none have the decoder the wrong way round, it means every single loco has CV29=34.  Locos with wires reversed would need CV29=35.

Of course, if you take your locos to a club and need to run them on DC you'll have to re-enable DC running, which means setting it to 38, or 39 for locos with reversed wires.



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 Posted: Thu Aug 21st, 2014 04:06 pm
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Silver foxx
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good info there,thanks for posting
:thumbs;-):cool:



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