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MERG/JMRI controller can't access CT DCX77zN decoder


dpgibbons
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I'm running JMRI Decoder Pro on the latest spec MERG DCC CANCMD controller. I'm unable to read/write to a CT DCX77zN decoder; all attempts generate a "Loco not Detected" (Error 301) message.

 

I've tried the DCX76Z v.66 decoder profile, which I'm told is the nearest fit, and also the simple CV programmer. I have tried reversing decoder orientation, installing in multiple locos and a second decoder, all with the same result. I have had the decoder tested on other controllers and it works fine. I've had no problem setting up decoders from other makers.

 

Posts on the MERG and JMRI forums have elicited no solution, so I'm stumped. I'm surely not the first to try this particular combination of controller and decoder.

 

Any ideas please? 

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