[Accrs] DCC 21PIN - NEM vs. NMRA

[Alameda County Central Railroad Society]

I lot of the new DCC models with factory sound are being shipped with the 21pin connector. (it’s actually a 2x11 connector, but only 21 pins are used)

Understanding that there are no single standard and there is competing vision between the European and American modelers/manufacturers there is cases where “compatibility” may not exist.

It is also important to know that when you purchase a 21Pin decoder you are likely getting the “Daughter Board” that plugs into the “Motherboard”  Below is an example of a Soundtraxx 21Pin.
[https://store.sbs4dcc.com/images/products/detail/TSU21PNEM.jpg]

When you purchase on of these products,  now you need to know what standard does it support – NEM or NMRA.   Your motherboard should match whatever standard the decoder is.



Here’s an example of a TSC product
[cid:image004.png at 01D35F75.15F6E230]

A few good resources I found are:

https://sites.google.com/site/markgurries/home/decoders/decoder-plugs-sockets/21-pin-plug-issues

http://www.sbs4dcc.com/tutorialstipstricks/21mtcconnector.html

http://www.dccwiki.com/NMRA_Connector

http://www.sbs4dcc.com/images/nem660_e.pdf

https://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-9.1.1_connectors_2015.05.22.pdf







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