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Hello Bernd,
thanks for your posting and detailed private mail.
The problem is complex and there are several reasons why this does 
not work:
1) Your receiver is a very old revision with a different product ID 
(=> not in the list of receivers Remote Buddy recognizes).
2) I actually have been able to get hold of such an old revision 
receiver several months ago (investing quite some money in the 
process, too). I have also been able to decode the protocol. Problem 
is, I can't initialize that revision of the receiver without 
violating Keyspan's copyright.
I'm still looking for an exit to that situation, but for now using 
that revision of the receiver with Remote Buddy is not possible.
Keyspan DMR bundles sell very cheaply on eBay these days, though. And 
when I was looking for an old revision, I didn't find a single offer, 
there (all offers were of the newer revision). Not exactly a solution 
with your model of the receiver, but a not very expensive alternative.
Hope that helps.
Best regards, 
Felix