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Can One Change CV29 Value Using a Function - LokSound? - DCC - Sound - Getting You Started. - Your Model Railway Club
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 Posted: Sat Aug 27th, 2016 12:47 am
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SRman
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I have an ESU LokSound v3.5 that developed a fault. It works perfectly going forwards, but there is no drive in reverse and the sounds run away (no load). It currently has sounds for a T9 4-4-0 and is fitted into  Hornby model, on which I have not fitted a front coupling, so the need to reverse it is not great but it would be useful on occasions (my layout has continuous runs).


I had an idea last night that if I could swap the power feed to the brushes using a switch, I could run in reverse. Then I thought that a physical switch is a bit inconvenient, and would require lifting the model simply to get it to go backwards, so I progressed to thinking about an electrical/electronic switch that could be operated by a function output from the decoder. Then the idea hit that even this is getting over-complicated, and all I need to do is reverse the feed through CV29, by adding or subtracting 1 to or from its value. So. the question is, is this possible to do by assigning a function in the decoder?


If I could do this, I could simply drive the loco forwards to where it has to pick up a train, then hit a function (let's say, function 4), and it will instantly add 1 to whatever is in CV29. The loco would then move backwards even though the controller still says forwards (I have NCE Power Cabs and Pro Cabs).


Any takers?


Please note, I am posting this exact text on multiple forums. If you have a solution, it is entirely up to you whether you post answers in all forums you are a member of (to reach slightly different audiences with some overlap of their citizens), or choose to answer on just one. In that sense, apologies if members of the multiple forums keep seeing the same question. :)



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 Posted: Sat Aug 27th, 2016 01:53 am
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MaxSouthOz
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Hi Jeff

I think I've grasped what you are asking.  Bit 1 of CV 29 reverses the direction of the motor, but it does it permanently.

So, to change Bit 1 every time you want to go backwards would mean going into Programming mode (in my case, F 7  >  CV  >  value  > etc), before you drive off.

I have a better suggestion.  Either take the decoder out of the loco and post it to me, or send me the loco.

I will put it on my Lokprogrammer and fix the settings.

What do you think?

Cheers



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 Posted: Sat Aug 27th, 2016 02:35 am
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SRman
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Hi Max.

Thanks for the offer, but I do have a LokProgrammer myself. The problem lies on the decoder outputs.



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 Posted: Sat Aug 27th, 2016 02:41 am
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MaxSouthOz
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Ah.  So the decoder has a fault on the board.

Well, I don't know how you could map a CV change to a function button.

I'm guessing that you have asked the question on the Loksound forum?

I haven't seen it come up.

https://groups.yahoo.com/neo/groups/loksound/info

I'll certainly be interested to see if they have any suggestions.



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 Posted: Sat Aug 27th, 2016 06:21 am
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SRman
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Thanks Max. I'm not on the LokSound Forum, but I am in some Yahoo groups, so I'll look at joining them as well.



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 Posted: Sat Aug 27th, 2016 09:07 pm
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BCDR
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Hi Jeff,

ESU are likely to charge for repairing a V3.5 (they have a sliding scaleover here). First thing I would do is to have a re-blow of the decoder by the supplier. Next would be to trade in the V3.5 for a new V4.0 (which I think ESU do, whether your retailer would is another issue).

Have you checked to see whether it's the direction key on the controller? (Do your other decoders function normally?).

I have never tried this, I have no idea whether it can be done, but could you program the sequence of steps to change CV29 to 2 macro functions - one for forward, one for reverse? The macro function just remembers the keystrokes used (AFAIK). That would keep the numerical keys assigned to their function. You can do this with accessories, so...

Nigel



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 Posted: Sun Aug 28th, 2016 01:57 am
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SRman
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Nigel, the macro idea is probably a very good one: one that I hadn't thought of! 

It is only this one decoder that is playing up, all others work normally. I know legomanbiffo, who has done quite a few of my diesel and electric sounds, offers the trade-in of older ESU decoders for newer ones, but as this one is faulty, I'm not sure if he'll do it or not - I'll have to ask. I will be contacting him very shortly for some reblows in any case (he sends me the files locked to the serial number of the decoder I want to reblow - saves packaging up the decoders, postal costs and possible loss or damage in both directions).


edit: Another though occurred to me after typing the reply above: with Kernow Model Rail Centre's 4 TC units due next year, I could reblow sounds for one of those onto this decoder as the TC sounds won't be direction-dependent (no motors!), when suitable sound projects become available.



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 Posted: Sun Aug 28th, 2016 02:06 am
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MaxSouthOz
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I'd give you some bucks for your old decoder, Jeff.  I use them for building sounds and the like.

It will probably switch lights on and off as well.

Let me know.

Cheers



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 Posted: Sun Aug 28th, 2016 02:09 am
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SRman
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Hi Max. 

Make me an offer (P.M. me) and we can talk turkey!! I can use the funds to contribute to a replacement decoder.

:)



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 Posted: Sun Aug 28th, 2016 02:15 am
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MaxSouthOz
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I've got to dash out to an NMRA meeting, Jeff.

I'll PM you when I get back.

Cheers



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 Posted: Sun Aug 28th, 2016 08:50 am
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SRman
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That's OK Max. We had to go to a child's birthday this afternoon and evening. Got your PM. :)



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 Posted: Fri Sep 2nd, 2016 03:53 pm
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To make my trains go backwards, I connect the red electric cable to the other rail, and then put the black electric cable where the red one was...

I'm hoping to soon have saved up enough pocket money to buy one of these...

http://www.ebay.ie/itm/Vintage-MECCANO-Ltd-A3-Power-CONTROL-Unit-SPEED-Control-HORNBY-Trains-/291852190948?hash=item43f3bf04e4:g:jaQAAOSw2GlXF1Ip

Douglas [aged 7 and three-quarters]



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 Posted: Fri Sep 2nd, 2016 07:13 pm
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gastwo
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Postage £10.95 ??!!

Not for you Doug. Make one. You know you can.

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 Posted: Sat Sep 3rd, 2016 03:55 am
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SRman
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Chubber wrote: To make my trains go backwards, I connect the red electric cable to the other rail, and then put the black electric cable where the red one was...

I'm hoping to soon have saved up enough pocket money to buy one of these...

http://www.ebay.ie/itm/Vintage-MECCANO-Ltd-A3-Power-CONTROL-Unit-SPEED-Control-HORNBY-Trains-/291852190948?hash=item43f3bf04e4:g:jaQAAOSw2GlXF1Ip

Douglas [aged 7 and three-quarters]
 Top marks to Douglas for thinking this through thoroughly. His scheme would work for analogue DC, but not for DCC, where the direction is dictated from within the decoder.

Thank him for the suggestion, though.

:) :cool:



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 Posted: Wed Nov 8th, 2017 12:48 pm
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peterm
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Did you have any luck with this problem or did you get another decoder.



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 Posted: Wed Nov 8th, 2017 10:03 pm
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SRman
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I ended up selling to Max and buying a new one, Peter. :)



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 Posted: Wed Nov 8th, 2017 11:28 pm
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peterm
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Simplest way Jeff.



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