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Locked ESU LokPilot 5 Fx Decoder #esu

 

All,
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I took a quick look at previous posts, but didn't see anything that helps. I just bought a Jagerndorfer RailJet control car with a LokPilot 5 Fx decoder installed. I use a Digitrax system and can operate the lights with the hand controller on address 03. There are four functions for the lights.
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I have tried reading the decoder on my program track and on the main with no luck.
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Any hints on how to program this? I'd like to end up giving this the same address as the engine at some point, once I can read it and assign function numbers.
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Thanks,
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Alan - Valdez, Alaska
 

Alan,

Do any of the lights flicker when you try to read? NMRA-standard reading a decoder on the programming track requires a way for the decoder to control its current consumption. Motor decoders usually pulse the motor for that. The 5 Fx micro needs a 150Ohm resistor on AUX1 (see the manual), I'm not sure about the 5 Fx (the manual doesn't explicitly mention it) but it can't hurt to try.

Although my experience with a 5 Fx micro on my PR3 and my DCS51 was that reading still did not work, probably required an even smaller resistor for higher current pulses. It did work with the LokProgrammer (in "CV read" mode) and with my DCC++EX programmer, so I concluded the Digitrax ACK pulse detector is probably somewhat off.

Reading a decoder can also be done through RailCom on the mainline, but Digitrax does not support it.

You could try programming it on the mainline without reading first, but that would mean a lot of guessing as to the default settings.

In your shoes, my first steps would be trying to read it on a different (non-Digitrax) system (and possibly building a $25 DCC++EX programmer from an Arduino Nano and an L298P Nano motor shield) and/or trying a 150Ohm resistor on AUX1 to give the decoder something to generate ACK pulses.

As you can see from my posting, it's most probably not a JMRI issue but a hardware (Digitrax <-> ESU) issue. You can verify this by trying to read any CV, for example CV1, with your Digitrax command station...

Hope this helps,
Heiko

On 9/4/24 21:27, Alan Sorum WL7CG via groups.io wrote:
All,
I took a quick look at previous posts, but didn't see anything that helps. I just bought a Jagerndorfer RailJet control car with a LokPilot 5 Fx decoder installed. I use a Digitrax system and can operate the lights with the hand controller on address 03. There are four functions for the lights.
I have tried reading the decoder on my program track and on the main with no luck.
Any hints on how to program this? I'd like to end up giving this the same address as the engine at some point, once I can read it and assign function numbers.
Thanks,
Alan - Valdez, Alaska
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Heiko,
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Thanks for the reply. I visited a shop in Innsbruck and got hooked on Jagerndorfer models. I have a Tauris and set of RailJet cars, my first experience with non-Digitrax decoders. Being in rural Alaska, I don't have an alternative layout/system that I can access. I need to read the control car decoder to see how it was programed, before I can reassign the function buttons. I want to program the function decoder to the same address as the engine, but right now there are some commonly assigned function buttons. Running it on tow throttles kind of works.
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I think I will order the ESU programmer, since this won't be the last ESU decoder I come across. Thanks again!
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Alan

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