DCC Signal

[Anonymous]

I am building a DCC decoder interface circuit.  I need to know the signal codes necessary for manipulating the speed/direction, changing the CV variables, and other functions such as toggling the locomotive lights on and off.

What I know already:

I know how a DCC signal communicates electrically with the decoder (command control uses a PWM system with 58us marks for a 1 and 100us for a 0) and the basic packet format (preamble, address, data, and parity check).

I found a pdf http://www.nmra.org/standards/DCC/standards_rps/S-92-2004-07.pdf that contains a table of codes (see figure 2) for manipulating up to 28 speeds and the signal codes necessary to do it.

Thanks 

 

[Vail and Southwestern RR]

If I understood the question right, I think the answer is in here:

http://www.nmra.org/standards/DCC/standards_rps/rp921.html

 

[Vail and Southwestern RR]

I just thought I'd toss in that depending on what you are trying to do it could well have already been done, and can be had for free.

http://jmri.sourceforge.net/

and to interface from the PC to the tracks:

http://bbmgroup.home.comcast.net/sprog/

(that one costs, but it is hardware, so you'd expect it.

I have not used these, but I know that lots of people use DecoderPro (JMRI), and I think SPROG sounds nifty.

 

[CSX Robert]

If I understood the question right, I think the answer is in here:

http://www.nmra.org/standards/DCC/standards_rps/rp921.html

Here is the PDF version:

http://www.nmra.org/standards/DCC/standards_rps/RP-921%202006%20Aug%2021.pdf

Here is the web site for all of the NMRA Standards and Recommended Practices.

http://www.nmra.org/standards/consist.html

If you got Standard 9.2 off of this page, then the Recommended Practices are further down on the same page. There are other Recommended Practices you may want to look at too.