The DZ121 was discontinued in 2002. There were some interoperability issues with Easy DCC, MRC and Lenz. The exchange offer is no long valid. This article is still published for reference only.At that time, Easy DCC, Lenz and MRC users could return DZ121's to Digitrax for no charge replacements that will work on their systems. There was no reason for Digitrax, Wangrow or NCE users to replace any DZ121 decoder unless they wre having problems.The text at that time:For Easy DCC and Lenz users who are having problems: To determine whether your DZ121 should be returned, read back CV07. A ...
Short Address Programming Note When programming the short address (CV01) in your DZ121, the decoder will automatically set CV19 to 0, CV29 to 0, CV 55 to 80, CV56 to 30 & CV57 to 0. This is done to insure compatibility with DCC systems that only recognize short addressing (2 digit mode). When using long addressing (4 digit addressing) these CV's are not affected.After changing the short address (CV01), you will probably want to change CV29 to 06 or another appropriate value based on your operations. You can do this on the programming track or, if you forget, you can ...
Many thanks to Dick Sutcliffe, Superintendent BR &T Railway Co. for this application note!Install the DN121 in the tender 1. The tender is easy to open by removing two screws so you can pull the decoder out and put in a plug when running on DC layouts. 2. Use a piece of styrene to raise the decoder off the weight. 3. Notch the front edge of the tender frame to bring the wires through to loco (all power pick up is in the loco). 4. Split the loco frame to isolate the motor brushes, remove the contact springs in the ...