DCC Impulses Column - 3
Enter the all-purpose CV number 29. Bit 5 of CV 29 tells the
decoder whether it is to respond to the short or long address.
If bit 5 = 0, the decoder listens to the short address. If the
decoder is to respond to the long address, bit 5 needs to be 1,
raising the number in CV 29 by a value of 32. Thus, if you read
CV 29 and get a value of 32 or more – frequently 33 to 39 – the
decoder is responding to a long address. If it is less than 32 you
know that it is responding to the short address.
There is a fine online calculator available to determine the val-
ues to put in to CVs 17 & 18, if you want to do it yourself. It also
calculates CV 29, for those so inclined. Check it out as this web
3: Two diesel locos making up a consist – this is train 103
from the PCMRC layout after it has run around its train and
is ready to run back home. Loco 2016 has a value of 103 in
CV 19; the 2035 has 231 (103 + 128) in CV 19. See figure 7.
3
MRH-Feb 2013
