Digitrax DH123PS User manual

DH123PS
Fits Many HO
Locomotiv s
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nDigitr x LocoMotion®System-Your locomotives look like the real thing.
The Digitrax LocoMotion System makes them run like the real thing, too!
Torque Compens tion for smooth as silk silent operation.
128 Speed Step operation (14 or 28 steps can also be used).
Momentum with acceleration and deceleration.
Norm l Direction of Tr vel is user selectable.
Switching Speed feature for easier and faster access to yard speeds.
3 Step Speed T bles set start, mid and max voltage for custom control.
28 Step Speed T bles with 256 level resolution for precise control.
nSuperSonic motor drive for silent operation.
nFX3Function outputs for prototypical lighting effects and on/off control:
Const nt Brightness Lighting with directional or independent control.
Re listic Effects like Ditch lights, Mars lights, strobes, and many more.
FX3 & St nd rd Function Qu lifiers operate functions based on direction,
F0 on or off, direction and F0, and whether loco is moving.
Function Rem pping for custom function setup.
M ster Light Switch turns off all lights & functions with one keystroke.
nPlug ‘N Pl y Digitrax 9 in to DCC Medium lug 1.0” harness
nTr nsponder ID Equipped ready for transponding on your Layout
Compatible with digital surround sound systems
nAll Mode Progr mming
nDecoder Reset CV with or without speed table reset.
nMotor Isol tion Protection helps prevent damage to your decoder.
nB sic, Adv nced & UniVers l Consisting
n2 Digit nd 4 Digit Addressing
nDCC Comp tible
nFCC P rt 15, Cl ss B RFI compli nt
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1 DH123D Decoder 1 Instruction sheet
1 DHWH S 1" Harness, 9 in lug
to DCC Medium lug
©2011 Digitrax, Inc. www.digitrax.com 1
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HO Scal
Mobil D cod r
DCC Plug ’N Play with 1.0” Harn ss
1.5 Amp/2 Amp P ak
2 FX3Functions, 0.5 Amp

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See the Digitrax Decoder Manual for complete decoder test procedures, installa-
tion instructions, programming and technical information. Digitrax manuals and
instructions are updated periodically. lease visit www.digitrax.com for the lat-
est versions, technical updates and additional locomotive-specific installations.
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1. Carefully remove the locomotive’s shell from the frame. Notice the orienta-
tion of the shell to the frame so that you can reinstall correctly.
2. The DH123D uses the DHWH Digitrax Easy Connect 9 in Harness
System which consists of a 1.0” harness that has a Digitrax 9-pin plug on
one end and a DCC medium plug on the other. Remove the jumper plugs
from the DCC medium socket on the factory light board and plug in the
DCC plug end of the harness.
3. lug the 9 in plug on the DHWH harness into the socket on the decoder.
The plug is notched to fit easily into the socket in only one orientation.
4. Replace the loco shell. You are now ready to run your locomotive. The
DH123D is factory programmed to address 03. You can easily customize
the address and other features. See section “Customizing Your Decoder”
that follows.
Inst ll tion Notes:
1. Do not exceed the decoder’s 500mA total unction output rating.
2. To use a unction output with an inductive (coil) type load, see the Digitrax Decoder Manual
or more in ormation to avoid damage to the decoder.
3. See the Digitrax Decoder Manual or ull details o wiring 12-16V lamps, 1.5V lamps, and
LEDs. Lamps that draw more than 80 mA when running require a 22 ohm 1/4 watt resistor in
series with the directional light unction lead to protect the decoder.
Figure 1. DH123PS Wiring Diagram
©2011 Digitrax, Inc. www.digitrax.com 2
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Warning: to prevent decoder
damage, be sure the motor
brushes are properly isolat-
ed before applying power.
NOTE: The Violet and Green leads o the harness are
not used by this decoder.

©2011 Digitrax, Inc. www.digitrax.com 3
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Your Digitrax decoder is ready to run and will operate using address 03 with no
additional programming. For a more prototypical railroading experience, your
decoder can be customized for your specific locomotive by programming some
of the Configuration Variables, or CVs, available. See the Digitrax Decoder
Manual or the Digitrax web site for more information.
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The first CV most people change is the decoder address. This allows you to
independently control each loco with a unique address. Digitrax decoders are
shipped with CV01 (AD2), the two digit address, set to 03. Following is a brief
description of how to change the decoder address with a Digitrax DT series
throttle. See your Starter Set Manual for complete programming instructions.
1. lace the loco on the programming track. Go into rogram Mode on your system.
On DT400/DT402 press PROG. On DT300, DT100 & DT200 press RUN/STOP &
FN/F0.
2. Choose AD2 for 2 digit addressing or AD4 for 4 digit addressing (DT400/DT402
and DT300). (Ad for DT100 & DT200, see set manual for 4 digit instructions).
3. Choose the address you want to set up for the decoder.
4. Complete address programming. On DT400/DT402 press ENTER. On DT300,
DT100 & DT200 press SEL.
Note: CV29 must also be programmed to enable 4 digit addressing, this is
done automatically by the DT400/DT402 & DT300 but not on earlier throttles.
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Decoder reset lets you reset all CV values to the initial factory settings. To
reset all CV values, program CV08 to a value of 008. You also have the option
of resetting all values except the 28 speed step tables. To do this,
program CV08 to a value of 009.
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Digitrax gives a one year “No Worries" Warranty against manufacturing defects and
accidental customer damage on all Digitrax products.
Th t's it! A simple, str ightforw rd w rr nty with no tricky l ngu ge!
Visit www.digitrax.com for complete warranty details and instructions for returning
items for repair.
Digitrax, Inc. is not responsible for unintentional
errors or omissions in this document.
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M de in U.S.A.
307-1011-0000
DH123PS D cod r
Fits A Vari ty Of DCC R ady Locos
Available
Computer InterfaceComputer Interface
Decoder ProgrammerDecoder Programmer
Sound ProgrammerSound Programmer
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