SoundTraxx Tsunami Steam Users Guide - Manual (Page 13)

Tsunami Steam Sound User’s Guide Page 10
Programming Procedure
As each DCC system is different, the procedure for programming a CV will
vary depending upon the system. Unfortunately, we cannot provide detailed
instructions to cover every command station and have to assume that you
have some level of understanding regarding it’s capabilities and operating
procedures. For specific programming procedures, please consult your DCC
system manual.
Locking and Unlocking CVs
The CV Lock/Unlock is a relatively new feature available in some DCC
decoders which allows you to program a decoder without the danger of
overwriting the programming in another. This especially useful in installations
where multiple decoders are used. For example, if you have installed a
function decoder in addition to the sound decoder, you may wish to lock the
CVs after programming to prevent accidentally programming one or the other.
To use the CV Lock feature implemented in CV 15 and 16, Bit 0 of CV 30
must first be set to 1 (the default value is 0). This is to avoid inadvertently
locking the decoder when the CV Lock feature is not needed.
CV 15 and 16 are used for locking and unlocking the decoder. CV 15 is
the Unlock Code and may be programmed to any value between 0 and
255 regardless of whether the decoder is locked or unlocked. CV 16 is the
Lock Code and may be set to any value between 0 and 7 but only when the
decoder is unlocked. Attempts to program CV 16 with a value greater than 7
will be ignored.
The decoder is unlocked when the value in CV 15 matches the value in CV
16. Otherwise the decoder is locked and can not be programmed in either
operations mode or service mode. Further, a locked decoder can not be reset
to its factory defaults until it is first unlocked. Tsunami decoders are shipped
from the factory with all CVs unlocked, that is, CV 15 and 16 are both set
to 0.
Note that if the decoder is unlocked, changing the value in CV 16 will
instantly lock the decoder. You must then set CV 15 to the same value as
was just programmed into CV 16 to unlock the decoder again.
If you decide to use the CV Locking feature for a multi-decoder installation,
each decoder installed inside that locomotive must first have its Lock Code
in CV 16 set prior to installation of any other decoders. Otherwise, all the
decoders will have the same Lock Code and the feature will not work. The
easiest way to go about this is to first install one decoder and program its
Lock Code. Then install the next decoder and program its Lock Code. Since
the first decoder is now locked it will be unaffected by the programming of
the second decoder (unless you accidentally set the Lock Code of the two
decoders to the same value. If this happens you will need to disconnect one
decoder and start over). Continue in this manner until all decoders have been
installed and their Lock Codes have been set.
Basics of Programming