Digitrax UT4D User Manual

The UT4D is a low cost, simple-to-operate duplex equipped radio throttle:

n Duplex Equipped Radio operation with UR92 Duplex transceiver

n InfraRed operation with UR90, UR91 or UR92

n Supports 2 & 4 digit addressing

n Built for operation

n Features a large knob for precise speed control

n Features a three position toggle switch for Forward, Brake and Reverse

n Simple address selection with rotary selectors

n UT4D can’t program decoders, turnoff layout power or throw turnouts

Forward
Brake
Reverse
Switch

Infrared emitters

Rotary Address
Selectors

Function Keys

Status Lig

ht

©2009 Digitrax, Inc. www.digitrax.com 1

UT4D Duplex Equipped Radio

Utility Throttle User Manual

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Joining a Duplex Group For The First Time With UT4D:

1. Insert a known good 9 volt battery into the UT4D.

2. Plug the UT4D into a LocoNet port on a layout equipped with a UR92
transceiver to join that layout’s Duplex Group.

3. After the UT4D has joined a Duplex Group, any time a battery is inserted
into the UT4D while it is unplugged, it will search for that Duplex Group.
The UT4D will join the Group if it is within range.

4. When the throttle has re-joined the Group, the Status light will blink Green
5 times. The UT4D then will attempt to select the Loco address on the 4
rotary address selectors.

5. If the UT4D’s Status light blinks red 5 times this means that no UR92 with
the Group Name is within range. You may need to move closer to the
UR92 for the Duplex group to re-join the Group or you can simply plug in
to LocoNet to join another Duplex Group that is available.

Loco Selection: (Acquiring a locomotive address to operate on UT4D)

1. Dial up the desired 2 or 4 digit address using the 4 rotary address selectors.
Addresses from 0000 through 9983 are supported by UT4D.

(2-digit addresses are entered in the 2 right hand selectors, example 0025)

2. If a Duplex Group has been joined wirelessly, simply press the SEL key to
begin operating the loco address, otherwise plug the UT4D into a LocoNet
port and automatic selection of the address will occur.

3. The Status light will blink Green about once per second to confirm the
address selection.

4. If the Status light is blinking Red, this means the loco address shown on the
address selectors is not selected or is already selected by another throttle
(see Stealing below if you want to steal the loco from the other throttle).

If the selected loco is already moving, then the loco’s speed will gradually
match the current speed setting of the UT4D. This means that if you’ve select­ed a train that’s moving forward at approach speed, and the UT4D throttle is
set to zero, when selection occurs, the train will slowly come to a stop.

Forward/Brake/Reverse Control Switch

Changing the Direction switch from ‘Forward’(F) to the center ‘Brake’ position
causes the loco to stop at the loco’s programmed deceleration rate. Changing
quickly from ‘F’ to ‘R’ causes the loco to stop at the programmed deceleration
rate, then reverse direction and accelerate at the loco’s programmed
acceleration rate.

Release a Locomotive Address and Dispatch Address from UT4D:

When you are finished running a particular locomotive address, you can release
it from the UT4 by changing the position of the rotary address selectors. You
can also Dispatch the address so that it is specially identified as the just
released loco so that another user can take control of it.

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To release or dispatch, a loco under current UT4D control:

Duplex Radio Mode: (not plugged in and joined to a UR92 Group)

1. Change the rotary address selectors to a different address. The Status light
will change to blinking red showing that the loco address is released.

2. (Optional Dispatch Step) Press the Dispatch key if you wish to Dispatch
this loco address and make it available for selection by another throttle as a
Dispatched loco address.

IR Mode: (not plugged in)

1. Be sure the UT4D Infrared emitters are pointed at a UR panel. Change the
rotary address selectors to a different address. The Status light will change
to blinking red to show the loco address is released.

2. (Optional Dispatch Step) Press and hold the Dispatch key.

3. Plug the throttle into a LocoNet port then release the Dispatch key.

Walkaround Mode: (wired operation, plugged in to LocoNet)

1. Change the rotary address selectors to a different address. The Status light
will change to blinking red to show the loco address is released.

2. (Optional Dispatch Step) Press the Dispatch key if you wish to also
Dispatch this loco.

Stealing: Stealing is defined as acquiring control of a loco address that is
being used currently by someone else on another throttle. To ensure the loco­motive does not get conflicting speed and direction commands, it is best to
ensure the other throttle has released this address.

To ‘Steal’ a loco address:

Duplex Radio Mode: (not plugged in and joined to a UR92 Group)

1. Change the address selectors to desired address

2. Press the Steal key . The Status light will start blinking green to show the
loco is now selected after being stolen from another throttle.

IR mode (no UR92) or Wired Mode :

1. Release the loco address and unplug the UT4D from LocoNet.

2. Dial up the address of the loco you want to steal.

3. Press and hold the ‘STEAL’ key while plugging the throttle into a LocoNet
jack. Note: To steal or dispatch another loco, you must unplug the UT4D
and repeat the above sequence.

©2009 Digitrax, Inc. www.digitrax.com 4

2443 Transmitter RD

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850-872-9890

Panama City, Fl 32404

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850-872-9557

www.digitrax.com

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[e-mail]

©2009 Digitrax, Inc. www.digitrax.com 5

Consisting (MU)

If the loco you select is the “top” loco in a consist the Status light will blink
Green, and you have complete control over the consist speed, direction and the
functions on the “top” loco.

When you’ve selected a consist member that is not the “top” loco, the status
light will show steady Orange and the UT4D will control only the functions of
the loco. You will not have throttle, forward/reverse direction or brake control
of the consist. This is normal. The UT4D is not designed to make up or break
up consists, but can control functions of individual consist members.

The Function Keys: Controlling lights and sounds

There are 7 function keys and a SHIFT key on the UT4D for controlling func­tions F0-F12. Functions F0-F6 are controlled by pressing the corresponding
key. F7-F12 are controlled by using the SHIFT key with the function keys. To
use functions F7-F12 you must press and hold down the SHIFT key on the
lower left row as you press the F7 through F12 key. The function keys toggle
on and off with each press, except for F2, which is ON only when held down,
and OFF when released. The F2 key has a ‘Hold’ feature that can be set by
holding the F2 key down for 15 seconds. Tapping F2 again turns it off.

Duplex Radio and Infrared Operation:

The UT4D has wireless Duplex radio capability for layouts that are equipped
with one or more UR92 Duplex transceivers within range. The UT4D will not
modify the UR92 Group Name or Channel#. UT4D will not work with UR91
simplex radio receivers in radio mode but can be used as infrared or walka­round on simplex radio layouts.

Duplex operation:

1. Install a known good 9 volt battery into the UT4D.

2. Plug the UT4D into a LocoNet port to get the Group Name

3. When the UT4D is unplugged from LocoNet, the unit will automatically
change to Duplex mode and generally operate as if it were plugged in.

Infrared operation:

In addition to Duplex Radio capability, your UT4D is equipped with infrared
emitters that allow it to work on layouts that are equipped with one or more
operating UR90 and/or UR91 infrared receivers.

1. Install a known good 9 volt battery into the UT4D

2. With the UT4D plugged in to LocoNet, dial up the address using the 4
rotary address selectors and press SEL to acquire the locomotive address.

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3. Unplug the UT4D from LocoNet. The throttle will automatically shift into
infrared operation. Any UR90/91 unit that sees infrared commands will
blink a red led to show the message was received OK.

In infrared mode you can control: Locomotive speed, Direction, Brake and,
Functions F0-F8 (F9 and above are not available in IR mode). You must plug
in to select a new loco address while in IR mode. To Select, Dispatch or Steal
another loco when in IR mode you must plug the throttle into a LocoNet.

UT4D Battery Conservation Mode (Sleep Mode):

The UT4D has an automatic battery conservation mode when not connected to
a LocoNet port. After about 8 seconds of no action, the normal Status light
blink rate , either green or red, of about once per second will slow down to
once every 3 seconds to show the UT4D is conserving battery power. Any
user action will exit this mode automatically and the Status light will return to
the faster blink rate.

Digitrax “No Worries Warranty” & Repair

Digitrax gives a one year “No Worries" Warranty against manufacturing
defects and accidental customer damage on all Digitrax products. That's

it! A simple, straightforward warranty with no tricky language!

For complete warranty and repair details see www.digitrax.com.

Please contact Digitrax tech support before sending anything to us for service
so that we can try and resolve the problem by phone or e-mail.

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.

Digitrax, the Digitrax train logos, LocoNet, Super Empire Builder Xtra, Super
Chief Xtra, Zephyr, Jump & others are trademarks of Digitrax, Inc. This manu­al may not be reproduced in any form or translated into other languages with­out Digitrax’s express permission.

This manual was updated November 2009.

Get the latest version of all manuals at www.digitrax.com.

UT4D is covered co

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US p

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5,739 and others.

Dig

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2443 Transmitter RD

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850-872-9890

Panama City, Fl 32404

F

850-872-9557

www.digitrax.com

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[e-mail]

©2009 Digitrax, Inc. www.digitrax.com 6

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2443 Transmitter RD
Panama City, FL USA
32404-3157
www.digitrax.com

T 850-872-9890
F 850-872-9557

UT4D

DuplexEquippedRadioUtilityThrottle

307-UT4D-0000

Made in U.S.A.