SoundTraxx Tsunami Quick Start - Manual (Page 14)

Tsunami Quick Start Guide Page 11 Tsunami Quick Start Guide Page 11
Programming and Reading CVs
Certain command stations allow you to read a CV during Service Mode
Programming, which is useful to verify its current setting. If you have
trouble reading or verifying CVs, the problem may be due to the design
of your command station and not the DSD itself. Tsunami and all other
decoders communicate back to the command station using what’s called an
acknowledgment pulse, which is defined in NMRA RP-9.2.3 as “an increased
load on the programming track of at least 60mA for at least 5ms.” Like most
decoders, the DSD generates the acknowledgment pulse by momentarily
applying power to the motor.
If your DSD is otherwise working properly (i.e., responds properly on the
mainline to speed and direction commands) but your command station
is having troubles reading CV data from the DSD, it may be due to
incompatibilities between the electrical requirements of the DSD (which are
different from conventional decoders due to the added audio circuitry) and
the electrical characteristics of your programming track. In such an event,
you will need to use a Programming Track Booster, such as SoundTraxx
PTB-100 (P.N. 829002). The PTB-100 amplifies the programming track
signals to levels that work best with Tsunami. It is easy to install (see below)
and inexpensive. An advantage to using the PTB-100 is that it also provides
short circuit detection and some helpful diagnostics. It works well for all other
SoundTraxx decoders, too.
Figure 3 - General Wiring Diagram for the SoundTraxx PTB-100
Power In
Power In
Programming Track Output
Programming Track Output
Programming Track
To
P
ro
gr
am
m
in
g T
rac
k
COMMAND
STATION
POWER
SUPPLY
COMMAND
STATION
PTB-100
BLACK
BLACK
ORANGE
ORANGE
YELLOW
YELLOW
Programming