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Help needed changing loco direction CV via a Zephyr...........

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  • Member since
    September 2003
  • From: Southeast Texas
  • 5,449 posts
Help needed changing loco direction CV via a Zephyr...........
Posted by mobilman44 on Wednesday, April 2, 2014 3:10 PM

Hi,

This is a rookie question, but I'm in need of basic programming help..........

I set up a test track/work station away from the layout using a Digitrax Zephyr for power.   I easily reset the loco numbers of a BLI ABBA consist, and then attempted to reverse the natural direction of one A unit and one B unit (so they could run together in the ABBA configuration.

As I recall, CV29 is the cv that will do this.   But I can't seem to get it to work.  

So my questions are, Am I using the correct CV?   And What value should I put in it?

Sorry to pester you guys with this basic stuff, but its been over a year since I've done this and the memory retention ain't what it used to be...............

 

Thank you!  

ENJOY  !

 

Mobilman44

 

Living in southeast Texas, formerly modeling the "postwar" Santa Fe and Illinois Central 

  • Member since
    September 2003
  • From: Southeast Texas
  • 5,449 posts
Posted by mobilman44 on Wednesday, April 2, 2014 3:30 PM

Thanks David.   All I do is add a 1 to the value and it does the trick.

I was almost right, but was using a 1 instead of adding a 1.

ENJOY  !

 

Mobilman44

 

Living in southeast Texas, formerly modeling the "postwar" Santa Fe and Illinois Central 

  • Member since
    February 2002
  • From: Mpls/St.Paul
  • 13,892 posts
Posted by wjstix on Wednesday, April 2, 2014 3:50 PM

Normally increasing or decreasing the amount in CV 29 by 1 will reverse the engine's "normal" direction. If you mean that when you do that, it doesn't work, I would check the manual for the decoders involved to see if they have a different process for doing it.

Stix
  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Posted by richhotrain on Wednesday, April 2, 2014 4:42 PM

My favorite web site for calculating CV29 values:

http://www.2mm.org.uk/articles/cv29%20calculator.htm

Rich

Alton Junction

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