JerseyJon Posted July 10, 2020 Share Posted July 10, 2020 I've just fitted an ESU FX4 decoder to my 4-TC and the lights at the front and the back come on, and can be independently switched off but I can't get the coach interior to respond to any of the functions? As far as I can gather the FX4 is a 6-fn decoder - does anyone have any ideas? Thanks! JJ Link to post Share on other sites More sharing options...
RMweb Gold Kaput Posted July 10, 2020 RMweb Gold Share Posted July 10, 2020 4TC needs Aux 3 and 4 to be logic level functions on the decoder. ESU website/manual claims the 21pin FX4 can switch between full power and logic level but doesn't seem to actually say how to do it. Link to post Share on other sites More sharing options...
RMweb Premium brushman47544 Posted July 12, 2020 RMweb Premium Share Posted July 12, 2020 There’s a long standing thread on the 4-TC, which may have something. Presumably all the coaches are the correct way round? Link to post Share on other sites More sharing options...
JerseyJon Posted July 13, 2020 Author Share Posted July 13, 2020 Yes, all in the correct order. I think kaput may have hit the nail on the head. unfortunately my controller (zephyr) doesn’t deal with Cv’s above 257 and the only other controller I have access to is an ECoS which won’t either! i might see if if can sort it via JMRI decoder pro but that is a whole new level of DCC for me! guess the passengers will have to sit in the dark! Link to post Share on other sites More sharing options...
Pete the Elaner Posted July 13, 2020 Share Posted July 13, 2020 54 minutes ago, JerseyJon said: i might see if if can sort it via JMRI decoder pro but that is a whole new level of DCC for me! JMRI is a lot easier than programming with a throttle & will cost you no more than a cable suitable for connecting PC/Mac/Pi to your control system, but having a computer in the right place may not be convenient for many. It will only act like a handset, so if your system cannot access CVs above 257, then JMRI may not be able to either. The alternative is a Sprog for programming. I have never used one but it is a small control system with limited current output & no throttle, which makes it particularly suitable for programming with JMRI. 2 Link to post Share on other sites More sharing options...
JerseyJon Posted July 14, 2020 Author Share Posted July 14, 2020 Thanks Pete. My layout is controlled by a MERG unit, not sure if they go to 257+. Will look into the SPROG. my test track is connected to the zephyr! Link to post Share on other sites More sharing options...
NIK Posted July 14, 2020 Share Posted July 14, 2020 57 minutes ago, JerseyJon said: Thanks Pete. My layout is controlled by a MERG unit, not sure if they go to 257+. Will look into the SPROG. my test track is connected to the zephyr! Hi, You could try programming the decoder on the main so you can see if the MERG command station deals with higher CV numbers. Regards Nick Link to post Share on other sites More sharing options...
JerseyJon Posted July 15, 2020 Author Share Posted July 15, 2020 For completeness of the thread, the relevant CV is 124, taking values of 0 or 128 to flip the modes in the Lokpilot FX. Thanks for the help! JJ Link to post Share on other sites More sharing options...
DK123GWR Posted December 30, 2023 Share Posted December 30, 2023 I found this thread after trying to use a Rails 6 function decoder in a 4-TC and being unable to work the interior lights. If I have understood correctly, this cannot operate the interior lights, and I needed the 4+2 version. Is that right? Link to post Share on other sites More sharing options...
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