DN121PS
Fits Many DCC-Ready N and HO
Scale Locomotives
Features:
1 Amp (1.5 Amp Peak) Mobile DCC Decoder
New Thin Profile for easier installation
Supports Both Short (127) & Long (10,000) Address Modes
User Programmable Address, Acceleration, Deceleration, Start-voltage,
Mid-point voltage, Max Voltage and more
Constant brightness directional headlights (Does not support independent
forward & reverse light operation)
Programmable from DCC compatible equipment without opening the loco
Smooth conversion to analog operation with functions operational
Smooth locomotive speed control with user selectable 14, 28, or 128 forward
& reverse speed step capabilities
Supports Basic, Advanced & UniVersal Consisting
Compatible with DCC standards
Complies with FCC Part 15, class B RFI requirements
©2003 Digitrax, Inc www.digitrax.com 1
DD
igitraxCCommandCControl
Run Your Trains, Not Your Track!
N Scale
Mobile Decoder
1.0 Amp/1.5 Amp Peak
2 Functions, 0.5 Amp
DCC Plug 'N Play with 1' Harness
Parts List
1 DN121PS Decoder 1 Instruction sheet
Installation Information
See the Digitrax Decoder Manual for complete decoder test procedures, installation instructions, programming and technical information. Digitrax manuals
and instructions are updated periodically. Please visit www.digitrax.com for the
latest versions, technical updates and additional locomotive-specific installation
instructions.
Installation Instructions - Atlas U23B (HO Scale)
1. Carefully remove the locomotive’s shell from the frame. Notice the orienta-
tion of the shell to the frame (Figure 1) so that you can reinstall the shell
correctly.
2. Remove the dummy plug from the locomotive’s DCC-ready socket. (Figure
2) The jumper plug allows the loco to operate on a standard DC track or in
analog mode on a DCC track. Pin 1 is marked for proper orientation of the
decoder.
©2003 Digitrax, Inc www.digitrax.com 3
3. The DN121PS has a short, 1" harness with a DCC medium plug on the end
of it. The plug is oriented so the pin for the orange wire is inserted in the
socket marked “pin 1.” Seat
the decoder firmly in the socket. (Figure 3) The Green and
Violet wires are not used on
the DN121PS because it only
supports F0 Fwd and F0 Rev
functions.
4. Replace the loco shell. You are
now ready to run your locomotive. The DN121PS is factory
programmed to address 03.
You can easily customize the
address and other features. See
section “Customizing Your
Decoder” that follows.
Installation Notes:
1. Do not exceed the decoder’s
500mA total function output
rating.
2. We recommend that the Blue
wire, also called +Common or
Lamp Common, be connected
as shown. If you wish to omit
the Blue wire in your installation, consult the Digitrax
Decoder Manual for more
information.
3. The head lamp should be
hooked up using the
Blue/+Common wire for optimal Digitrax transponding
operation.
4. See the Digitrax Decoder Manual for full details of 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 function lead to protect the decoder.
5. Some locomotives employ filter capacitors for RFI suppression in the locomotive wiring. These may cause problems with Supersonic decoders and
non-decoder analog operation on DCC. This capacitor should be removed
for safe operation.
450 Cemetery Street
T
770-4441-77992
Norcross, GA USA 30071
F
770-4441-00759
www.digitrax.com
E
sales@digitrax.com
©2003 Digitrax, Inc www.digitrax.com 2
DD
igitraxCCommandCControl
Run Your Trains, Not Your Track!
Figure 1. Remove loco shell
Figure 2. Remove dummy plug
Figure 3. Install decoder
dummy plug
Pin 1, Orange lead
Pin 1, Orange lead
Customizing Your Decoder
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.
Changing the Decoder Address
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 Place the loco on the programming track. Go into Program Mode on your
system. On DT400 press PROG. On DT300, DT100 & DT200 press
RUN/STOP & FN/F0.
2. Choose AD2 for 2 digit addressing or AD4 for 4 digit addressing (DT300 &
DT400). (Ad for DT100 & DT200, see your Starter Set manual for 4 digit
instructions).
3. Use your throttle to choose the address you want to set up for the decoder.
4. Complete address programming. On DT400 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 DT300 & DT400 but not on earlier throttles.
Warranty & Repair
All warranties on Digitrax products are limited to refund of purchase price,
repair or replacement at Digitrax’s sole discretion. Except as expressly stated in
the full warranty statement, there are no warranties, express or implied, including but not limited to any warranties of merchantability or fitness for a particular purpose. For complete warranty details see www.digitrax.com.
Damaged decoders should be returned directly to Digitrax for repair.
Digitrax, Inc. is not responsible for unintentional
errors or omissions in this document.
Made in U.S.A.
307-3007-0000
DN121PS
Fits a Variety of N and HO Scale Locomotives
450 Cemetery Street
Norcross, GA USA 30071
www.digitrax.com
T 770-441-7992
F 770-441-0759
E
sales@digitrax.com
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