Digitrax DT400 User manual

DT400/DT400R
When a 9 volt battery is inserted in a DT400 or
DT400R throttle, the following two splash screens
are displayed in sequence.
The first splash screen displays the firmware ID
and version.
The second splash screen displays the battery
voltage.
When a DT400 or DT400R throttle is plugged into
the LocoNet it displays either Ir” or Ra and the
LocoNet ID of the LocoNet it is plugged into.
When a DT400R throttle is then unplugged, it will
only control trains on a LocoNet with that ID.
A DT400 throttle has no radio capability and needs
to be plugged into the LocoNet to change any
setting, such as speed and direction. However, it
will work as a memory throttle. You can unplug
the DT400 and the train will maintain its speed and
direction until the DT400 is plugged in and a
setting is changed.
A DT400R has a simplex (one way) radio capability. Once the LocoNet ID has been set by plugging
it into the LocoNet, speed, direction and functions, e.g. headlight, can be controlled with the DT400R
unplugged. The DT400R needs to be plugged into the LocoNet for all other operations, such as
entering a decoder number.

DT402D
When a 9 volt battery is inserted in a
DT402D throttle, the following three
splash screens are displayed in
sequence.
The first splash screen displays the
firmware ID and version.
The second splash screen displays
the Duplex Group Name and Duplex
Channel ID. The group name for our
N-Trak layout is currently set to
OKNRail and the channel is 26.
The third splash screen displays the
battery voltage and Duplex Channel
ID. A DT402D throttle needs at least
8.0V to operate reliably
A DT402D has a duplex (two way) radio capability. If the throttle displays the correct Duplex Group
Name and Duplex Channel ID, all throttle functions can be performed with out being plugged into the
LocoNet, and the throttle should not be plugged into the LocoNet. If the throttle does not display the
correct Duplex Group Name and Duplex Channel ID, briefly plug the throttle into the LocoNet to set
the group name and channel.

Track Power (DT400/DT400R/DT402D)
To turn track power on or off, first press
the PWR button.
The throttle message displays +On –Off.
The Mode Indicator displays Pw.
To turn track power on, press Y +. Note the track power
indicator dot. If it is
flashing, press Y + again to
change it to on steady
indicating track power on.
To turn track power off, press N -.

Enter Loco ID (DT400/DT400R/DT402D)
The Mode Indicator displays FN.
Throttle address shows flashing
SEL (or previous loco #)
indicating which side is active.
Note: to switch sides turn knob on
the other side.
Press Loco button.
Message window displays either
stat 128 or Sel Loco.
The Mode Indicator displays
flashing Lo.
Enter locomotive ID.
Press Loco button.
Displays shows power setting.
The Mode Indicator displays FN.
Throttle address shows locomotive ID

Locomotive Operation (DT400/DT400R/DT402D)
Note: this example shows use of right throttle to the left and left throttle to the right.
Control speed with knob.
The Mode Indicator displays FN.
Power setting
Arrow show direction (forward or reverse).
Throttle address shows locomotive ID.
Reverse button changes direction.
Numbers indicate which functions are on.
Example show function 5 on.
Flashing smoke indicates active side.
Toggle functions with numeric pad.
Function 0 is head lights as indicated by light bulb.
Function 1 for sound decoders is the bell as indicated by bell.
Function 2 for sound decoders is the horn or whistle as indicate by whistle.

Multiple Unit Consists (DT400/DT400R/DT402D)
Enter the lead locomotive ID on right side and the second locomotive ID on the left side.
Ensure left smoke
is flashing.
Check direction
arrows. (see
below)
Press MU button.
Message briefly
displays Consist.
Message then
alternates + = add
and –remove.
The Mode
Indicator displays
MU.
Press Y + to add second locomotive to consist
Left speed indicator Control speed for both locomotive
shows CN. with right knob.
Right speed indicator show power
setting for both locmotives.
Flashing smoke indicates which
locomotive responds to function
buttons.
Note: if locomotives are facing the same direction, the left and right direction indicators need to show
the same direction. If locomotives are facing opposite directions, the left and right direction indicators
need to show opposite directions.

Clear Loco IDs (DT400/DT400R/DT402D)
If any locomotives are consisted, they should be removed from the consist
Left speed indicator shows CN.
Ensure left smoke is flashing.
Press MU button.
Press N - to remove second locomotive
from consist
Ensure smoke is flashing on side to clear
locomitive ID.
Press LOCO button.
Locomotive ID is flashing.
Press EXIT button. This clears the
locomotive ID from the command station.
Note that pressing LOCO then DISP clears
the locomotive ID from the throttle, but the
command station continues to control the
locomotive. This allows another throttle
can take control of that locomotive by
entering the locomotive ID.
Repeat for opposite side.

Enter Loco ID (UT4D)
Enter the locomotive ID on the rotary address
selectors.
Press the SEL button or plug the throttle into the
LocoNet.
Check the status light. If it is blinking green the
locomotive ID has been acquired.
If taking locomotive control from another throttle,
press the STEAL button.
Locomotive Operation (UT4D)
Control direction with the three position switch: Left is reverse.
Center is brake (stop)
Right is forward
Control speed with
knob.
Fully counterclockwise
(7 o’clock) is stop
Fully clockwise
(5 o’clock) is full
power.
Toggle functions with
function pad.
For functions 7-12,
press & hold the
SHIFT button and
press the function key.

Glossary
CN Consist DT400/DT402 indication that loco ID has been added to
consist (speed and direction controlled by another loco ID)
D Duplex Duplex (two way) radio allows all controls without being
plugged into the LocoNet
DISP Dispatch DT400/DT402/UT4D button to release control of locomotive
ID Identifier A number (0-9983) which identifies a locomotive decoder.
Ir Infrared Infrared allows locomotive operation by pointing throttle at
infrared receiver.
LOCO Locomotive DT400/DT402 button to select locomotive ID
LocoNet Digitrax communication network
Mode Indications: Fn Function Normal locomotive operation functions available on the
keypad
Lo Loco Selection Locomotive Address Selection Mode
Mu Multiple Unit Multiple unit (consist) operation set up and break up
Pw Power Turn track power on and off
MU Multiple Unit DT400/DT402 button to select multiple unit mode
PWR Power DT400/DT402 button to select track power mode
R or Ra Radio Simplex (one way) radio allows direction, speed & function
without being plugged into LocoNet
SEL Select DT400/DT402 indication that no locomotive ID is entered
SEL Select UT4D button to select locomotive ID
SP Speed DT400/DT402 indication that power setting are displayed
V Volts