DCS Command System User’s Guide
Universal Locomotive & Accessory Operation
Advanced Wiring
Conventional, Command, or Both
If you plan to run trains in conventional and command mode on the track at the same
time you will need to use a Variable channel of the TIU. Using the Variable channel of
the TIU, you can run conventional engines (vary the voltage to the track) and command
engines (send digital commands) on the track at the same time to vary the speed of the
engine for example. It is important to remember that the top speed of the command
train will be limited to the voltage on the track.
Note: The variable channels require 22 volts AC power at the Variable Input to provide the voltage
displayed on the DCS Remote. If less than 22 Volts AC is provided to the Variable Input the voltage
output to the track will be less than that displayed in the DCS Remote. The TIU Variable Channel
will NOT vary DC power.
Using DC Power Supplies
It is important to remember the DCS system was designed for inside layouts. If DCS is
used outdoors on One gauge or (G gauge) layouts, please make sure the system is pro-
tected from the weather (rain and snow for example). In addition, DC power will NOT
pass through the TIU Variable Channels. Therefore, use only the Fixed 1 & 2 Channels
with DC power supplies. Also remember the polarity is critical to DCS Command opera-
tion. The positive (+) rail carries the digital signal. You may have to place the engine on
the track in the opposite direction if the engine does not have a polarity switch. It is also
very important to keep in mind the positive output (+) from the DC power supply must
be connected to the positive (+) input terminal on the TIU Fixed channel to carry the
DCS signal to the track.
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