Digitrax UT1 User manual

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Digitrax
Command
Control
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UUTT11
Traditional Style
LocoNet Throttle Manual
Digitrax, Inc.
450 Cemetery ST #206
Norcross, GA 30071 USA
[phone] Fax [phone]
www.digitrax.com
Digitrax Manuals & Instructions are updated periodically.
Please visit www.digitrax.com for the latest version of all manuals.
This manual was updated 03/03.

1
1.0 UT1 Utility Throttle Features and Specifications 3
2.0 Using your UT1 3
2.1 Turning On Track Power 3
2.2 Turning Off Track Power 4
2.3 Running a Locomotive 4
2.3.1 Run An Analog Locomotive on Address "00" 4
2.3.2 Run A DCC Equipped Locomotive 5
3.0 UT1 Throttle Control Panel 6
3.1 General color codes 6
3.2 The Throttle Knob 6
3.3 Direction Toggle Switch 7
3.4 Address Selector Rotary Dials 7
3.5 Status Indicator 7
3.6 Shift Key 7
3.7 Run/Stop Key 7
3.8 ACQ/DISP Key 7
3.9 F0/F3 Key 7
3.10 F1/F4/ON Key 8
3.11 F2/F5/OFF Key 8
3.12 Four Top Row LEDs (Chase Lights) 8
4.0 UT1: System Modes 8
4.1 UT1 Configuration Mode 8
4.1.1 UT1 Configuration Options 8
4.1.2 UT1 ID Number 9
4.2 Track Power Mode 9
4.3 Walkaround Operation on LocoNet 9
4.4 Stop Mode 10
4.5 Address Mode 10
4.6 Programming Mode 11
4.7 Switch Mode 11
5.0 Running Trains 12
5.1 Locomotive Speed Control 12
5.2 Locomotive Direction Control 12
5.3 Selecting a Locomotive (Safe Mode) 12
5.4 Selecting A Locomotive (Quik Mode) 13
5.5 Dispatching Locomotives 14
5.6 Controlling Lights & Functions 16
5.6.1 Controlling Functions on Consisted Locos 16
UT1 Traditional Style Throttle Manual
Table of Contents

1.0 UT1 Utility Throttle Features and Specifications
· The UT1 is a "traditional" hand held DCC throttle. The UT1 is laid
out with a single knob for speed control and a simple toggle switch
for direction.
· Digitrax LocoNet network forms a simple, reliable interconnect
between all Digitrax Command Control System components using
extremely reliable and convenient gold plated RJ12 6 pin modular
telephone jacks.
· Control up to 98 locomotives (97 DCC & 1 Analog)
· 128 speed step operation!
· Simple locomotive selection using two rotary selectors.
· Control directional lighting & 5 additional function outputs from the
keypad. If you have locomotive equipped with sound, controls for
bell & whistle are on F1 & F2. F2 is a non-latching control that
allows you to sound the horn for as long as the key is held down. F2
can be configured to be non-latching.
· F3 can be configured to be momentary for remote coupler functions,
etc...
· Special "DISPATCH" function to allow consists or 4 digit addresses
to be operated by the UT1.
· "SAFE" mode operation allows smooth pick-up and or release of
trains or locomotives.
Your success with and enjoyment of our products are very important to
us. After all, this is a hobby and it is FUN!!! Please read this manu-
al carefully before you install your system. We have included lots of
hints and operating ideas based on our experience with the Digitrax
system. If you have questions not covered by this manual please
contact your dealer or Digitrax.
2.0 Using your UT1
For operation, the UT1 does not need a battery. The UT1 will remember
the last throttle settings after it is unplugged from LocoNet and will
resume when it is plugged back into LocoNet.
Plug the UT1 into any LocoNet jack on your LocoNet system
When the UT1 is first connected to LocoNet all the LEDs in its display
will blink on and then off again. This means that the throttle is
working and is communicating as it should.
2.1 Turning On Track Power
Turn on the track power by pressing and holding the "RUN/STOP" button, then
simultaneously pressing the "ON/F1" button. The command station will beep
once and the "TRACK STATUS" light on the command station will come on.
3
6.0 Troubleshooting 17
6.1 Clean Track 17
6.2 UT1 Won't power up when plugged in (LEDs Flicker) 17
6.3 Decoder Won't Respond 17
6.4 Emergency Stop 17
6.5 Mechanical Drive Train Problems 17
7.0 FCC Information 17
8.0 Warranty and Repair Information 18
2
Digitrax, LocoNet and others included in this manual are trademarks
of Digitrax, Inc.
Digitrax, Inc. is not responsible for unintentional errors
or omissions in this document.
©Digitrax, Inc. All Rights Reserved. Printed in USA
UT1 Traditional Style Throttle Manual
Table of Contents (continued)

2.3.2 Run A DCC Equipped Locomotive
Connect UT1 to any LocoNet jack on your LocoNet System.
In order to select a DCC locomotive, you must know its address. All
Digitrax decoders are factory programmed to the default 2 digit
short address "03." If your decoder has not been re-programmed
then select "03" as the address.
1. Select the two digit address "03" of the DCC locomotive you want
to run using the rotary selectors on the UT1. The left rotary selects
the "tens" and the right rotary selects the "ones".
2. Press "ACQ/DISP" to select locomotive. The "STATUS" LED
should be a steady green to indicate that you now control that loco-
motive.
3. If the "STATUS" LED is dark, the locomotive that you tried to select
is already being controlled by another throttle in the system and is
not available.
4. A red "STATUS" LED indicates that the direction switch is not set
to the same direction as the locomotive you are trying to select.
Reverse the direction toggle switch and the "STATUS" LED will
turn green.
5. Strobing green "Chase Lights" across the top of the keyboard indi-
cate the throttle speed is higher or lower than the locomotive you
are trying to select. If the LEDs are strobing Left to Right, turn the
throttle knob clockwise until the LEDs stop strobing and the "STA-
TUS" LED turns green. If the LEDs are strobing Right to Left, turn
the throttle knob counter clockwise until the LEDs stop strobing and
the "STATUS" LED turns green. NOTE: if the "STATUS" LED is
red then change the direction of the toggle switch.
6. Flipping the toggle switch to the right will make the locomotive go
forward. Flipping the toggle to the left will make the locomotive go
in reverse.
7. Turn the throttle knob clockwise to increase speed and counter
clockwise to decrease the speed. The throttle knob can rotate
approximately. 300 degrees from start to stop.
5
2.2 Turning Off Track Power
Turn off the track power by pressing and holding the "RUN/STOP" but-
ton, then simultaneously pressing the "OFF/F2"button. The com-
mand station will beep once and the "TRACK STATUS" light on the
command station will go out.
2.3 Running a Locomotive
Connect UT1 to any LocoNet jack connected to the command station in
your LocoNet system.
2.3.1 Run An Analog Locomotive on Address "00"
The address "00" is reserved for "Analog" locomotives or any locomotive not
equipped with a decoder.
1. Place a non-decoder equipped locomotive on the track. The locomo-
tive will make a "humming noise", this is the normal sound an ana-
log locomotive will make on a DCC layout.
2. Select the two digit address "00" of the analog locomotive you want
to run using the rotary dial selectors on the UT1. The left rotary dial
selects the "tens" and the right rotary dial selects the "ones".
3. Press "ACQ/DISP" to select locomotive. The "STATUS" LED
should be a steady green to indicate that you now control that loco-
motive.
4. If the "STATUS" LED is off, the locomotive that you tried to select
is already being controlled by another throttle in the system and is
not available.
5. A red "STATUS" LED indicates that the direction switch is not set
to the same direction as the locomotive you are trying to select.
Reverse the direction toggle switch and the "STATUS" LED will
turn green.
6. Strobing green "Chase Lights" across the top of the keyboard indi-
cate the throttle speed is higher or lower than the locomotive you
are trying to select. If the LEDs are strobing Left to Right, turn the
throttle knob clockwise until the LEDs stop strobing and the "STA-
TUS" LED turns green. If the LEDs are strobing Right to Left, turn
the throttle knob counter clockwise until the LEDs stop strobing and
the "STATUS" LED turns green. NOTE: if the "STATUS" LED is
red then change the direction of the toggle switch.
7. Flipping the toggle switch to the left will make the locomotive go
forward. Flipping the toggle to the right will make the locomotive
go in reverse.
8. Turn the throttle knob clockwise to increase speed and counter
clockwise to decrease the speed. The throttle knob can rotate
approximately. 300 degrees from start to stop.
4

3.3 Direction Toggle Switch
Flip to the right for forward direction and to the left for reverse direction.
3.4 Address Selector Rotary Dials
Rotate these two selectors to select the two digit address ( 00 to 98 ) of
the locomotive you wish to control. The left selector dials in the 10s
and the Right selector dials in the 1s. Select address "99" to select a
locomotive or consist that has been "DISPATCHED" from another
Digitrax throttle. (See section on dispatched locomotives.)
3.5 Status Indicator
Indicates the status of the UT1.
·Off indicates no locomotive is currently selected.
·Green indicates a locomotive has been successfully selected.
·Red indicates the direction and/or speed are out of correspondence
on a locomotive being selected.
·Blinking orange indicates the UT1 is in "Switch Mode".
3.6 Shift Key
· Press and hold to access F3, F4, F5.
· Press in conjunction with the ACQ button to "Dispatch"
3.7 Run/Stop Key
· Use as emergency stop. When held down will change locomotive
speed to "0". Turn throttle to "0" speed setting to regain control or
press RUN/STOP again.
· RUN/STOP key is used in conjunction with other keys to activate
other throttle functions.
3.8 ACQ/DISP Key
· Press to acquire any locomotive address after the address has been
dialed in with the rotary selectors.
· When address selector reads "99", press "ACQ/DISP" to acquire
locomotive address that has been dispatched by another throttle in
the system.
· If address selector is set to other than "99" press ACQ/DISP and
SHIFT to dispatch the locomotive address to another throttle in the
system.
· Press ACQ/DISP along with RUN/STOP to set Option Switches in
your booster.
3.9 F0/F3 Key
· Press F0 to toggle front and rear headlights on and off.
· Hold "Shift" and press F3 to toggle Function 3 on and off.
7
UT1 Throttle Diagram
3.0 UT1 Throttle Control Panel
3.1 General color codes
The UT1 is color coded according to how the keys are used.
The only RED key is Run/Stop. This is so you can't miss it in case of
emergency.
The BLUE keys are used in conjunction with the "SHIFT" key.
3.2 The Throttle Knob
Turn clockwise to increase the speed of your locomotive. Turn counter
clockwise to decrease the speed of your locomotive. There is about
300 degrees of rotation from 0 speed to full throttle.
6
R
LOCO ADDRESS
ST
F4 F5
UT1
F3
RUN
STOP
SHIFT
ACQ
DISP
ON OFF
F0 F1 F2
00
Throttle Knob
Section 3.2
D
irection Toggle Switch
Section 3.3
Address Selector
Section 3.4
Status LED
Section 3.5
Shift
Section 3.6 Run/Stop
Section 3.7
ACQ/DISP
Section 3.8
F0/F3
Section 3.9
F1/F4
Section 3.10 F2/F5
Section 3.11
Green LED Indicators
Section 3.12
Address Selector
Section 3.4

network. As soon as the UT1 powers up, release the F0 key. The
UT1 is now set to the new configuration and will continue to use
this configuration until you change it again. The UT1 will remember
this new configuration whether it is plugged in or not.
4.1.2 UT1 ID Number
All UT1 throttles come from the factory with the Throttle ID set to "00".
As you add throttles it is a good idea to make each throttle's ID
unique. Use the following procedure to set the ID number.
1. Unplug the UT1 from LocoNet.
2. Set the two digit ID number of your choice on the two rotary selec-
tors.
3. Press and hold the "SHIFT/PROG" key and plug back into LocoNet.
4. Release the "SHIFT/PROG" key. The UT1 will remember this num-
ber until you decide to change it.
4.2 Track Power Mode
If track power is off, press "RUN/STOP" and "ON" simultaneously to
have the Digitrax command station turn on the track power & go
through power up sequencing. Press "RUN/STOP" and "OFF" to
turn track power off.
4.3 Walkaround Operation on LocoNet
The UT1 does not use a battery to maintain its internal memory. All data
is stored in EEPROM. When the UT1 is connected to LocoNet It
receives its total power requirements from the network.
NOTE: The UT1 draws approximately 15 mA at a minimum 6.8V
DC and gets its total power requirements from the network. It
may be necessary to supplement the network power supply, on
large networks, when using multiple throttles. This can be done
using Digitrax UP5 Universal Panel(s), to expand LocoNet, with
the battery saver option hooked up.
When a UT1 is disconnected from the network it turns off, but all the
settings are retained in EEPROM while you move to a different part
of the layout.. When the UT1 is re-connected to the network, it will
reselect the locomotive it was previously controlling with all the pre-
vious settings intact.
When a UT1 with a selected in-use locomotive is disconnected from
LocoNet, for more than the system purge time (about 200 seconds),
the Command Station will purge these in-use locomotives to the
common state so that other throttles can access these locomotives. If
9
3.10 F1/F4/ON Key
· Press F1 to toggle Function 1 on and off.
· Hold "Shift" and press F4 to toggle Function 4 on and off.
· Press "RUN/STOP" and "ON" together to turn track power on.
3.11 F2/F5/OFF Key
· Press F2 to toggle Function 2 on and off.
· Hold "Shift" and press F5 to toggle Function 5 on and off.
· Press "RUN/STOP" and "OFF" together to turn track power off.
3.12 Four Top Row LEDs (Chase Lights)
· Indicates function status, lit when on
· All four LEDs strobing left to right means that you need to increase
speed on the throttle knob to complete the selection of a locomotive.
· All four LEDs strobing right to left means that you need to decrease
speed on the throttle knob to complete the selection of a locomotive.
· Indicates CLOSED when in Switch Mode.
· LED above ACQ blinking every 4 seconds indicates that the throttle
is active.
4.0 UT1: System Modes
4.1 UT1 Configuration Mode
The UT1 comes from the factory configured with the most common fea-
tures enabled as defaults. You can change these features to suit your
particular needs by the following procedure.
4.1.1 UT1 Configuration Options
1. Choose the features you want from the chart below. Add up the val-
ues of your choices to get the "SETTING" value. Example: 0 (Safe
Mode) + 2 (F2 Toggle on/off) + 0 (F3 toggle on/off) = "SETTING"
of 2. TABLE I
2. With the UT1 unplugged from LocoNet, Set the rotary selectors to
the proper setting (See Table I).
3. Press and hold the F0 key while you plug the UT1 into the LocoNet
Defaults
Options
0=Safe Mode
1=Quik Mode
0=F2 Momentary
operation
2=F2 Toggles on/off
0=F3 Toggles
on/off
4=F3 Momentary
operation
8

the throttle knob counter clockwise until the LEDs stop strobing and
the "STATUS" LED turns green. Flipping the toggle switch to the
right will make the locomotive go forward. Flipping the toggle to
the left will make the locomotive go in reverse.
6. Turn the throttle knob clockwise to increase speed and counter
clockwise to decrease the speed. The throttle knob can rotate
approximately. 300 degrees from start to stop.
Quik Mode
While in "QUIK MODE" the UT1 is able to select an available locomo-
tive regardless of its present speed and direction
1. Select the two digit address "03" of the DCC locomotive you want
to run using the rotary selectors on the UT1. The left rotary selects
the "tens" and the right rotary selects the "ones".
2. Press "ACQ/DISP" to select locomotive. The "STATUS" LED
should be a steady green to indicate that you now control that loco-
motive.
3. If the "STATUS" LED is dark, the locomotive that you tried to select
is already being controlled by another throttle in the system and is
not available.
While in "QUIK MODE" the UT1 is able to select an available loco-
motive regardless of its present speed and direction. The selected
locomotive will change direction and or speed to match the cur-
rent settings on the UT1. Care should be taken to insure that the
UT1 is at a comparable speed setting and direction before select-
ing a locomotive.
4.6 Programming Mode
The UT1 has no programming ability. To program decoders use a system
throttle such as a UT2 or a DT100 series throttle.
4.7 Switch Mode
Turnout Control
The UT1 can be used to throw turnouts on your layout if they are con-
nected to a stationary decoder such as a Digitrax DS54.
1. Press the "RUN/STOP" and the "ACQ" buttons at the same time to
activate "Switch" Mode.
2. Use the two rotary selectors on the UT1 to select the turnout address
to throw or close (With the UT1 you are limited to a two digit
turnout address).
3. The LED above "ACQ" will light if the last known state of the
turnout selected is the "closed" position.
4. Press "ACQ" to throw and close the turnout.
5. The LED above "ACQ" will be dark if the last known state of the
11
the original UT1 is reconnected after a purge of its last in-use loco-
motives, and no settings have changed on the UT1, it will start the
selection process again and as long as no one else has selected that
locomotive, the UT1 will re acquire it. The designation of locomo-
tives as in-use or common ensures orderly sharing of locomotives on
the layout and increases the system's ability to run more locos at a
time.
4.4 Stop Mode
Press "RUN/STOP" for 1 second by itself and the locomotive under con-
trol of your throttle will go to Emergency Stop or "0" speed. There
are two ways to restart your locomotive.
· Turn the throttle knob counter clockwise to "0" speed. If you now
increase the throttle setting, your locomotive will respond normally.
· If you press "RUN/STOP" again, for 1 second, the locomotive will
resume at the speed it was running previously.
Use this only as an Emergency Stop.
4.5 Address Mode
The UT1 has two different "Addressing Modes", both of which are
described below. These Modes are selectable during the throttle con-
figuration process described later in Section 4.1.
Safe Mode (Default)
While in "SAFE MODE" the UT1 is unable to complete the selection of
an available locomotive unless its present speed and direction match
the settings on the UT1.
1. Select the two digit address "03" of the DCC locomotive you want
to run using the rotary selectors on the UT1. The left rotary selects
the "tens" and the right rotary selects the "ones".
2. Press "ACQ/DISP" to select locomotive. The "STATUS" LED
should be a steady green to indicate that you now control that loco-
motive.
3. If the "STATUS" LED is dark, the locomotive that you tried to select
is already being controlled by another throttle in the system and is
not available.
4. A red "STATUS" LED indicates that the direction switch is not set
to the same direction as the locomotive you are trying to select.
Reverse the direction toggle switch and the "STATUS" LED will
turn green.
5. Strobing green "Chase Lights" across the top of the keyboard indi-
cate the throttle speed is higher or lower than the locomotive you are
trying to select. If the LEDs are strobing Left to Right, turn the
throttle knob clockwise until the LEDs stop strobing and the "STA-
TUS" LED turns green. If the LEDs are strobing Right to Left, turn
10

a. If the UT1 is in “SAFE MODE” (default) and the locomotive
you have selected is available and the speed and direction match the
UT1, the “STATUS” LED will light a solid green. You will have
control of the locomotive.
b. If the “STATUS” LED lights red, the direction switch is reversed.
Flip the reverse switch to the other direction, the “STATUS” LED
will light solid green.
c. If the four top LEDs are strobing from left to tight or right to left,
this indicates a speed mismatch between the speed setting on the
UT1 throttle and the actual speed of the locomotive. Turn the throt-
tle knob in the direction of the strobing LEDs until the “STATUS”
LED turns green and the top LEDs go off indicating that the throttle
speed is now matched to the locomotive’s actual speed..
4. If the "STATUS" LED does not light at all when the address is
dialed in, that locomotive is already assigned to another throttle and
is not available.
5.4 Selecting A Locomotive (Quik Mode)
1. Connect the UT1 to LocoNet.
2. To select a locomotive, dial in the two digit address ( 00 to 98 ) of
the locomotive you wish to control using the two rotary selector
switches. The right selector dials in the 10s and the left selector dials
in the 1s. Select address "99" to select a locomotive or consist that
has been "DISPATCHED" from another Digitrax throttle. (see sec-
tion on Dispatched locomotives).
3. After selecting the address, press "ACQ/DISP" once to finish the
selection. If "ACQ/DISP" is pressed a second time the locomotive
will be returned to the system again. Pressing"ACQ/DISP" again
will reselect again.
4. If the UT1 is in "QUIK MODE" and the locomotive you have
selected is available, the "STATUS" LED will light a solid green.
The selected locomotive will immediately change direction and or
speed if the current settings on the UT1 don't match the locomo-
tive. Care should be taken to insure that the UT1 is at a compa-
rable speed setting and direction before selecting a locomotive
when in QUIK MODE".
5. If the "STATUS" LED does not light at all when the address is dialed
in, that locomotive is already assigned to another throttle and is not
available.
13
turnout selected is the "thrown" position.
6. If the LED above "ACQ" flashes on and off, the turnout state is
unknown.
7. Return the rotary selector switches to the locomotive address before
exiting "Switch Mode". If the locomotive address is not correct the
locomotive will be released.
8. Press "RUN/STOP" and "ACQ" at the same time to return to normal
operation.
While in "Switch" Mode, you can still control the speed and direc-
tion of your locomotive. Functions will also operate normally
while in "switch" Mode.
5.0 Running Trains
5.1 Locomotive Speed Control
To control the speed of a locomotive, just turn the Throttle Knob clock-
wise to increase speed and counter clockwise to decrease speed. The
knob has approximately. 300 degrees travel from minimum. or zero
throttle to full throttle.
5.2 Locomotive Direction Control
To change the direction of a locomotive, just move the direction toggle
switch to the right for forward direction and to the left for reverse
direction.
If the decoder has momentum, CV 03 and CV 04 set to a value above
zero, then reverse the direction while the train is moving, and the
locomotive will slow down at the programmed deceleration rate,
stop and accelerate again at the programmed acceleration rate in the
opposite direction.
5.3 Selecting a Locomotive (Safe Mode)
1. Connect the UT1 to LocoNet.
2. To select a locomotive, dial in the two digit address ( 00 to 98 ) of
the locomotive you wish to control using the two rotary selector
switches. The right selector dials in the 10s and the left selector dials
in the 1s. Select address "99" to select a locomotive or consist that
has been "DISPATCHED" from another Digitrax throttle. (see sec-
tion on Dispatched locomotives).
3. After selecting the address, press "ACQ/DISP" once to finish the
selection. If "ACQ/DISP" is pressed a second time the locomotive
will be returned to the system again. Pressing"ACQ/DISP" again,
etc.
12

UT1 Address Selection Flow Chart
6
6
4
2
ACQ
DISP
STATUS LED solid "GREEN"
RUN
LOCOMOTIVE
OLD
ADDRESS DESIRED
ADDRESS
ACQ
DISP
QUIK MODE
SAFE MODE
If STATUS LED
is RED
Flip Reverse Switch
If TOP 4 LED's strobe
L R Speed Up
L R Slow Down
Adjust Speed Knob
STATUS LED solid "RED"
=
USER
CHANGES ACQUIRE
LOCOMOTIVE
RELEASE LOCOMOTIVE
to "COMMON"
G
R
ACQ
DISP
"DISPATCH" ADDRESSED LOCOMOTIVE to "COMMON"
SHIFT
+
STATUS LED "DARK"
R
LOCOMOTIVE
NOT
AVAILABLE
15
5.5 Dispatching Locomotives
Dispatching is a special feature incorporated into the LocoNet "lan-
guage" to meet the needs of clubs and serious operators that wish to
enforce a strict discipline in how engineers access locomotives. An
example would be having a Superintendent of motive power making
all the locomotive assignments. This also allows the UT1 to run 4
digit addresses and consists made up on other throttles in the system.
To dispatch a locomotive using a the UT1, simply press the "ACQ/DISP"
and the "SHIFT" buttons together and the locomotive or consist cur-
rently being controlled will be released to the system and also spe-
cially marked as a "Dispatched" locomotive as apposed to just
releasing it to the system.
This specially marked Dispatch locomotive can be requested and
acquired by any UT1 using the "99" address on the address selec-
tors.
Note: The same care should be taken when acquiring a "DIS-
PATCHED" locomotive as when selecting from scratch.
This specially marked Dispatch locomotive can also be requested and
acquired by any BT2 "Buddy Throttle." BT2s have no address
selection capability of their own.
The BT2 that acquires the dispatched locomotive/consist will pick-up the
train in exactly the state it was in when it was initially dispatched,
i.e., if the unit was moving with lights on, it will be acquired with no
speed change and continue with lights on until the acquiring BT2
commands a new setting.
The TOP or control locomotive in a consist or MU lash up can be
Dispatched to pass control of the entire consist .
There is only one Dispatch marked locomotive in the system at a
time. Any throttle can select this dispatched address since it is
“common” to all devices in the system. If another locomotive is
dispatched, it will replace the last locomotive in the dispatch slot.
14

6.0 Troubleshooting
6.1 Clean Track
The majority of intermittent operation faults can be traced to bad connec-
tions and poor or noisy wheel pickups on locomotives. Check track
cleanliness and quality of wheel pickups. The DCC digital packet
communication strategy performs exceptionally well in a less than
perfect environment, and will often mask bad connections until they
are really impossible to work with!
6.2 UT1 Won't power up when plugged in (LEDs Flicker)
Voltage on LocoNet is dropping below 6.8V DC as the UT1 powers up.
If you are using UP5 Universal Panels to extend the LocoNet net-
work, hook up the battery saver option using an external 12V DC
power supply.
6.3 Decoder Won't Respond
If you cannot figure out what a locomotive is doing or "who" it is by
address, do not panic! Just reprogram the locomotive. If the decoder
is damaged, all is not lost, it can be repaired. See the Warranty sec-
tion for details.
6.4 Emergency Stop
If the layout starts to "get away" on you, either PRESS "RUN/STOP" or,
turn the track power to "SLEEP" on the command station. Either
way will give you a chance to regain your composure, and you will
be able to rejoin the contest.
6.5 Mechanical Drive Train Problems
Pay attention to the mechanical drive train and free movement of the
locomotive wheel sets. This is especially important with inexpensive
locomotives. Using Digitrax decoders with appropriate programming
settings, you can achieve surprisingly good quality motion, if you
carefully adjust the mechanisms for smooth running.
7.0 FCC Information
Radio or TV Interference: (this information is MANDATED by the FCC)
This equipment has been tested and found to comply with the limits for a Class B digi-
tal device, pursuant to part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference in a residential environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in
a particular installation. If this equipment does cause harmful interference to radio or
17
5.6 Controlling Lights & Functions
The UT1 has 3 function buttons. Each of these buttons controls 2 func-
tions. F0 thru F2 are controlled by just pressing the appropriate but-
ton. The function will toggle on and off each time a button is
pressed. F2 will only stay on as long as the button is held down, this
lets you control whistles and horns when using sound equipped loco-
motives.
To access F3 thru F5 press the "SHIFT" button at the same time as the
function buttons. F3 thru F5 will toggle on and off each time a but-
ton is pressed.
Note that for proper light operation, you must be sure that the
decoder’s speed steps match the speed steps sent by the
Command Station. If you are using a Digitrax or other
Advanced capability decoder, we recommend it be programmed
to the 128 speed step (default) mode or 28 step mode.
5.6.1 Controlling Functions on Consisted Locos
All locomotives in a "BASIC" consist (all locos the same address) will
respond to any function commands issued. F0 will turn the head-
lights of all the locomotives in the consist on and off. The other
functions will work the same way.
If the UT1 is controlling a consist that was made up using UniVersal
consisting with a DT100 and then "Dispatched " to the UT1, each
locomotive in the consist can have its headlight and functions con-
trolled independently as long as the consisted locomotives are using
2 digit addressing.
Select the 2 digit address of the locomotive in the consist using the
address selectors. Press "ACQ/DISP", the "STATUS" light will blink
green if a consisted locomotive, other than the TOP or controlling
locomotive address, is selected. Press the appropriate function button
to control the desired function in the consisted locomotive.
Note: The throttle and direction controls will not work while the
"STATUS" LED is blinking green. To regain control of the con-
sist, return the address selectors to the TOP or controlling loco-
motive address and press "ACQ/DISP", The "STATUS" LED
will turn to a steady green, speed and direction control will
return for the consist.
16

19
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and the receiver.
-Connect the equipment into an outlet on a circuit different form that to
which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help.
Note that any modifications to the equipment not expressly approved by Digitrax voids
the user's authority to operate under and be in compliance with CFR 47 rules, as admin-
istered by the Federal Communication Commission. Digitrax believes any conscien-
tiously installed equipment following guidelines in this manual would be unlikely to
experience RFI problems.
For Canadian Users:
"This digital apparatus does not exceed the Class B limits for Radio noise emission
from digital apparatus set out in the Radio Interference Regulation or the Canadian
Department of Communications."
Le present appariel numerique n emet pas de bruits radio-electriques depassant les lim-
ites applicables aux appareils numeriques de la classe B prescrites dans le Reglement
sur le brouillage radioelectrique edicte par le ministere des Communications du Canada.
8.0 Warranty and Repair Information
Digitrax gives a one year guarantee against manufacturing defects on
UT1 throttles. These units are not user serviceable (opening the case voids your
warranty). If a defect occurs, return the unit to us for service. We will repair or
replace these units at our discretion at no charge to you for one year from pur-
chase date. Proof of date purchased is required for warranty repair. This war-
ranty excludes damage due to abuse, such as failure to properly protect against
input over current with a fuse or circuit breaker or applying excessive input
voltage to the unit. We will make any repair needed because of physical dam-
age or electrical abuse at fair and reasonable rates. See www.digitrax.com for
complete warranty information and repair charges for non-warranty repairs.
All warranties on Digitrax products are limited to refund of purchase
price or repair or replacement of Digitrax products at the sole discretion of
Digitrax. In the event that Digitrax products are not installed or used in accor-
dance with the manufacturer's specifications, any and all warranties either
expressed or implied are void. Except to the extent expressly stated in this sec-
tion, there are no warranties, express or implied, including but not limited to
any warranties of merchantability or fitness for a particular purpose.
Digitrax, Inc. reserves the right to make changes in design and specifications,
and/or to make additions or improvements in its products without imposing any
obligations upon itself to install these changes, additions or improvements on
products previously manufactured.
18
Index
A
ACQ/DISP Key 7
Address "00" 4
Address Mode 10
Address Selection Flow Chart 15
Address Selector Rotary Dials 7
Analog Locomotive 4
B
battery 3, 9
C
Configuration Options 8
D
Decoder Won't Respond 17
Direction Control 12
Direction Toggle Switch 7
Dispatching Locomotives 14
E
Emergency Stop 17
F
F0/F3 Key 7
F1/F4/ON Key 8
F2/F5/OFF Key 8
FCC Information 17
Four Top Row LEDs 8
Functions 16
Functions on Consisted Locos 16
I
ID number 9
intermittent operation 17
L
Lights 16
Locomotive Speed Control 12
LocoNet 3
M
Mechanical Drive Train Problems 17
N
non-decoder equipped locomotive 4
P
Programming 11
Q
Quik Mode 11, 13
R
Run A DCC Equipped Locomotive 5
Run/Stop Key 7
Running a Locomotive 4
S
Safe Mode 8, 10, 12
Selecting a Locomotive 12
Shift Key 7
Status Indicator 7
Stop Mode 10
Switch Mode 11
T
Throttle Knob 6, 12
Track Power 3, 9
Troubleshooting 17
U
UP5 Universal Panel 9
UT1 Configuration Mode 8
UT1 Won't power up when plugged in
17
W
Walkaround Operation 9
Warranty and Repair 18