 Joined: 07/01/2015(UTC) Posts: 729 Location: England, Suffolk
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Good day,
As I'm still trying to salvage this loco form the scrap yard I have asked Marklin support if I can replace the ESU 21 pin decoder with one of theirs, specifically I asked about 60972 DCC
Marklin replied that I can use it but, there are a few things to keep in mind:
1) you have to define this motor type in the programing of the motor.
2) that aux 3 and aux 4 has to be defined as a logical function.
3) that for Aux 3 you need a steady function for the direction forward and for Aux 4 a steady function for the direction backward.
The first request seems easy, find the correct CV and set the parameter for SDS. You have to do the same on ESU's
2) and 3) are weird. How can I define the AUX as logical functions and then set a steady function for both AUXs ? Maybe the translation from German is not the most appropriate.
I don't understand it, a bit too complex. Is it clear for you Marklinists ?
I know you can't have variable motor steps with SDS because it 'destroys' the motor or PCB. That is why you can only set Vmin and Vmax but not Vmid, so I have understood.
At the same time I'm in talks with SB-Modelbau to rip out the SDS motor and PCB and install a decent motor with a proper DCC decoder.
Obviously the price difference is huge.
Cheers
Marco
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Joined: 23/07/2014(UTC) Posts: 8,472 Location: ENGLAND, Didcot
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Have you talked about this loco before? if so why haven't you continued that thread?
You have now lost the context of whatever the problem is by starting a new thread.
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 Joined: 17/09/2006(UTC) Posts: 18,771 Location: New Zealand
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Joined: 07/01/2015(UTC) Posts: 729 Location: England, Suffolk
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Hi Bigdaddy, indeed it was 39120 I spoke about. I don’t have that loco anymore as I’ve sold it.
Don’t understand why kiwi has made such a comment, pointless IMO, as this topic holds up itself and is not related to anything else
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Joined: 07/01/2015(UTC) Posts: 729 Location: England, Suffolk
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well apart from involving a conversation on the same crap motor and electronic delivered by Marklin
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Joined: 23/07/2014(UTC) Posts: 8,472 Location: ENGLAND, Didcot
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Originally Posted by: ocram63_uk  Hi Bigdaddy, indeed it was 39120 I spoke about. I don’t have that loco anymore as I’ve sold it.
Don’t understand why kiwi has made such a comment, pointless IMO, as this topic holds up itself and is not related to anything else Well, there is no indication of what the fault is, and you haven't indicated why you believe the decoder is faulty. We do try to help, but it helps if YOU provide the diagnostic information that allows the rest of us to short cut the "what is wrong" part. [edit] Also if had used a phrase along the lines of "i have another loco that has failed" then that would have been another clue that it wasn't the one you had previously posted about which I dimly remembered. [/edit]
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Joined: 07/01/2015(UTC) Posts: 729 Location: England, Suffolk
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kiwi you are right, let me explain. C-Sine motors + mfx decoders by ESU are a bad combination if you have an Ecos control unit. mainly when I tried changing decoder settings the loco driving characteristics went down the toilet and I had to reset the decoder. Same as with 39120 that you remembered.
I thought about using a ‘modern’ decoder by Marklin, hence this thread since I don't understand Marklin’s explanation.
I’m trying to sell this loco, it is spoiling the little fun I have left for trains, but nobody’s interested and if I can’t sell it I will have SB-Modellbau rip out the entrails and install something more decent to drive the loco.
What does logic function output mean? I've downloaded the decoder's manual but it still isn't clear. I will be using DCC and nothing else. The decoder already has Aux3 and 4 as logical outputs so what do they mean?
Thank you
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 Joined: 05/08/2015(UTC) Posts: 26 Location: Viken
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The MSD/3's Aux3 and Aux4 can be configured to be either logical (so it can control a transistor) or amplified (so they can be connected to a led, a telex, a smoke generator ….) From the factory the settings for them are amplified. When programming the decoder, you need to specify that they are logical:  Then you need to add a special function - always. This is then configured to control aux3 forward and aux4 backward.  The enginetype needs to be set to sinus.  Leif
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Joined: 07/01/2015(UTC) Posts: 729 Location: England, Suffolk
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Leif good afternoon,
I have an Ecos control Station. I will have to check the other DCC dedoders I have with Aux 3 and Aux 4 and see how they are setup prior to put them backwrds and forwards.
Thank you
Marco
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