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I have recently bought 2 Digitrax TF4 decoders to control coach lights, I am unable to read or program these.? I have iTrain and a YD7001 and can read and program all my other decoders which are ZIMO.

I originally thought that I had a bad connection to the rails and so I connected them directly (one at a time) into the programming track output on the YD7001, still they cannot be read.

Any help would be much appreciated.

Alan

Did you do these steps?


Program the TF4's Address & Function Outputs

1. Before using your TF4, set its address. This may or may not be the same address as a mobile decoder already installed in the loco or car depending on how you are planning to use the TF4. In the case of TF4's being used as a stand alone transponder or as a function decoder, choose an address that is not the same as another mobile decoder address in use on the layout.

2. Connect the RED & BLACK wires of the TF4 to a service mode DCC programmer and program the TF4's address as you would any mobile decoder address.

TF4 Default Settings:



Here is the link:

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Dennis Cherry
Owner/Moderator

Hi Dennis,

Thanks for your reply, that is what I have done. Both of the decoders refuse to be read from or written to.? The only connections I have are to the red and black wires, I am wondering if there is an issue in not having any loads applied.? I have checked my wiring, I'm not sure what next steps to take.

Alan

I always have some kind of load on the decoder when reading the CV's on the programming track. Usually? a small motor.
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Dennis Cherry
Owner/Moderator

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Caz

What is the error message you receive ??

Hi Caz,

It's confusing, documentation says that you can read and write but I can't get it to read.? Anyway, I can write and its now working.

Thanks everyone for your help.

Alan

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Caz