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Offline applor  
#1 Posted : 02 January 2019 13:14:47(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
Hi all,

A bit of a tricky one but maybe someone knows so I will give it a shot.

I have a Marklin MFX railcar VT 8.5 (39080) that I want to permanently swap its forward/reverse. The controller would be showing forward but in reality the railcar drives backwards.

I am hoping there is a CV bit that does this change for Marklin MFX decoders but I don't know if they do or what CV it is.

ESU for example have CV29 Bit 0 which reverses the direction of travel (forward becomes reverse).
The description however says it is only relevant for DCC standards and so I highly doubt it would be the same or even work for a Marklin MFX decoder.

You may be thinking I'm daft at this stage as to why?

Well the reason is the 39080 railcar has the front bogie powered with both axles having traction tyres.
Unfortunately this means I can't run this train with automation as the S88 detection points don't trigger until the rear bogie!

Easy solution is to just run it permanently in reverse.

Thanks

Edited by user 12 January 2019 05:05:58(UTC)  | Reason: Not specified

modelling 1954 Germany (era IIIa)
Offline H0  
#2 Posted : 02 January 2019 13:22:55(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 13,377
Location: DE-NW
Hi!

The 39080 has an ESU decoder. And somewhere in the mfx configuration space there is a bit that swaps the direction. Do you have a Central Station?

The ESU documentation for CV 29 indicates that bits 1 and 5 are only relevant for DCC. The direction bit is bit 0 and it is relevant for mfx.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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Offline applor  
#3 Posted : 03 January 2019 00:16:06(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
Originally Posted by: H0 Go to Quoted Post
Hi!

The 39080 has an ESU decoder. And somewhere in the mfx configuration space there is a bit that swaps the direction. Do you have a Central Station?

The ESU documentation for CV 29 indicates that bits 1 and 5 are only relevant for DCC. The direction bit is bit 0 and it is relevant for mfx.


Yes I have a CS2 (and ESU lokprogrammer). So you are saying that CV 29 bit 0 for directional change is relevant for MFX as well and what I need to change?

I will attempt change of it today and post how I go. Thanks for your help!



EDIT: Changed CV29 using my CS2 and it worked. Forwards and reverse are now swapped Cool

Edited by user 03 January 2019 05:43:31(UTC)  | Reason: Not specified

modelling 1954 Germany (era IIIa)
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Offline applor  
#4 Posted : 03 January 2019 12:49:21(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
Well it turns out there is a remaining issue that was unforeseen:

When the locomotive temporarily loses power, it remembers its existing speed but in the wrong direction!

I've found when testing that as the railcar drives over a tiny spot on my track and temporarily loses power, it then begins driving at the same speed in the opposite direction.
This means it then hits the same dead spot again and then begins driving in the opposite direction.
It therefore remains permanently stuck at the dead spot as it keeps driving back and forth over it again and againLOL

Laughs aside, it's rather annoying.

Looking at the manual, do you think this could be fixed with CV124 Auxiliary settings - Store direction (Motorola®)?
modelling 1954 Germany (era IIIa)
Offline Purellum  
#5 Posted : 03 January 2019 13:46:25(UTC)
Purellum

Denmark   
Joined: 08/11/2005(UTC)
Posts: 2,896
Location: Mullerup, 4200 Slagelse
Cool

Originally Posted by: applor Go to Quoted Post
It therefore remains permanently stuck at the dead spot as it keeps driving back and forth over it again and again


Brilliant BigGrin

You have invented a "dead spot detector", which shows you exactly where the dead spots are BigGrin

Per.

Cool

If you can dream it, you can do it!

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In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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Offline H0  
#6 Posted : 03 January 2019 14:07:04(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 13,377
Location: DE-NW
Originally Posted by: applor Go to Quoted Post
Looking at the manual, do you think this could be fixed with CV124 Auxiliary settings - Store direction (Motorola®)?
I suggest to give that CV a try.

Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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Offline applor  
#7 Posted : 04 January 2019 04:31:29(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
Originally Posted by: H0 Go to Quoted Post
Originally Posted by: applor Go to Quoted Post
Looking at the manual, do you think this could be fixed with CV124 Auxiliary settings - Store direction (Motorola®)?
I suggest to give that CV a try.



I am sure this is it but CV124 does not appear in the list after choosing edit CV in the locomotive page of the CS2Confused
modelling 1954 Germany (era IIIa)
Offline H0  
#8 Posted : 07 January 2019 13:31:37(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 13,377
Location: DE-NW
Originally Posted by: applor Go to Quoted Post
I can try using my lokprogrammer to change the CV. For some reason though my lokprogrammer can never read CV's from any decoder I've tried and I am hesitant trying to blindly write to it.
The Lokprogrammer has problems with C Sine locos. You should be able to change the decoder settings when you temporarily install it in a loco with a conventional motor (or the ESU decoder tester).
Don't try the DCC CV screen, read the complete decoder settings with the Lokprogrammer software.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
Offline H0  
#9 Posted : 07 January 2019 20:44:57(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 13,377
Location: DE-NW
Here's a screenshot of the CS2 PC software:
UserPostedImage

The bit to set is "Richtung" under "Memory B" on the "Misc" tab.
I didn't check a real ESU decoder on a real CS2, but IIRC this screen will also be shown for those.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
thanks 1 user liked this useful post by H0
Offline applor  
#10 Posted : 08 January 2019 11:06:01(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
That appears to have done the trick - thanks so much Tom!
modelling 1954 Germany (era IIIa)
Offline applor  
#11 Posted : 11 January 2019 07:28:01(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,289
Location: Brisbane, Queensland
edit: nevermind. It is working properly, I happened to get a ghost event on a different train exactly when the VT 8.5 happened to be at the dead spot and I thought the problem was still there. Blushing

edit edit: I retract that previous edit, I did see the VT8.5 do another reverse on me. I am not sure on the trigger though as it was in a different location. I need to test further.

Edited by user 19 January 2019 05:20:54(UTC)  | Reason: Not specified

modelling 1954 Germany (era IIIa)
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