Page 1
DT-3+1
DIGITAL
TRANSMITTER
Code Setting
Instructions
(800) 421-1587 • www.linearcorp.com
STEP 2
1-8. To set coding switch “A”, select any combination of ON or OFF positions for switch
keys numbered 3-8. Use a paper clip or other pointed object (except a pencil or pen) to
set the keys. To set coding switch “B”, select any combination of ON or OFF
positions for switch keys numbered 1-8.
STEP 4
described in the receiver’s installation instructions. Be sure the door/gate area
is clear. Activate the transmitter and verify that t he receive r trig gers th e operator.
Check that the correct button on the DT-3+1 activates the desired operator.
Setting Code Switches.
SWITCH "A"
Keys 1, 2, 3,
4, and 6 OFF
3
1
O
N
O
F
F
☞
CAUTION: IT IS NOT ADVISABLE TO SET A CODE WITH ALL KEYS ON, OFF, OR
ALTERNATING ON AND OFF. THESE CODES CAN EASILY BE DUPLICATED.
8
7
6
5
4
Keys 5, 7
and 8 ON
Test the equipment.
WARNING!
BE SURE DOOR
AREA IS CLEAR
OF OBSTRUCTIONS
1
2
3
4
The coding switches have eight keys numbered
SWITCH "B"
Keys 1, 3,
4, and 8 OFF
3
1
O
N
O
F
F
8
7
6
5
4
Keys 2, 5, 6,
and 7 ON
Connect the receiver(s) to the operators as
ACTIVATE TRANSMITTER
TO TEST EQUIPMENT
DESCRIPTION
The Delta-3 DT-3+1 is a hand-held four-channel transmitter with a
three-channel section plus an individual one-chann el section. It is
designed so that channel 1 may h ave a syste m code inde pendent
of the other three channels. This transmitter operating in
conjunction with four single-channel receivers, or one
multi-channel receiver, can perform a variet y of remote switching
tasks. The DT-3+1 has 2 digital encoders (switch A, and switch B).
Coding switch “A” is designed fo r use with private m ultiple ga rage
door openers, activated by push buttons 2, 3, and 4. Coding switch
“B” under the back cover is designed for use with less frequen tly
changed codes, such as a community access gate that can be
activated by push button 1.
NOTE: The transmitter transmits continuously with the button
pressed. The red indicator lights during transmission to indicate
battery condition. Should it fail to illuminate, it is recommended that
you replace the 9-volt battery.
STEP 3A
Code Setting for Four Single-Channel Receivers.
Set keys 3-8 of
receivers 2, 3, and 4 to match keys 3-8 of switch “A”. Set keys as follows:
Receiver 1 - Set all eight keys to match switch “B”, activates from button 1
Receiver 2 - Set Key 1 and 2 OFF, match keys 3-8, activates from button 2
Receiver 3 - Set Key 1 ON, Key 2 OFF, match keys 3-8, activates from button 3
Receiver 4 - Set Key 1 OFF, Key 2 ON, match keys 3-8, activates from button 4
Receiver #1 (Channel 1)
Match with the code set
on transmitter Switch "B"
2
3
1
O
N
O
F
F
Receiver #2 (Channel 2)
2
3
1
O
N
O
F
F
4
56
7
OPEN
Match with the code set
on transmitterSwitch "A"
4
56
7
OPEN
8
8
Receiver #3 (Channel 3)
on transmitter Switch "A"
2
3
1
O
N
O
F
F
Receiver #4 (Channel 4)
on transmitter Switch "A"
2
3
1
O
N
O
F
F
Match with the code set
4
56
7
OPEN
Match with the code set
4
56
7
OPEN
8
8
BATTERY REPLACEMENT
The battery should last 12 to 18 months with normal use. The red
LED on the face of the transmitter will glow when the unit is
activated. When the red LED lights dimly, or not at all when
transmitting, the battery needs to be replaced. Remove the battery
access door to change the battery. Any type of 9-volt battery can
be used.
REPLACE BATTERY WITH
FRESH 9-VOLT BATTERY
STEP 1
Locate coding switch.
There are two digital coding switches in the
DT-3+1 transmitter. Code switch “A” is exposed by removing the battery access
cover by inserting your thumbnail or small screwdriver under either of the two slots
at the edge of the case. To access switch “B” remove the battery and remove the
rear half of the case by gently pulling down and back on the b atte ry end of the rear
case. (CAUTION: the white plastic push buttons rest freely in case front and may
fall out if care is not exercised.)
CODING
SWITCH
"B"
STEP 3B
BATTERY
CODING
SWITCH
"A"
CODING SWITCH "A"
REAR VIEW WITH BACK COVER
REMOVED TO ACCESS SWITCH "B"
Code Setting for Four-Channel Receiver.
Set coding switch keys
3-8 of receiver to match keys 3-8 of coding switch “A” of the DT-3+1. Matching
these keys completes the coding procedure required to activate the first THREE
channels of the receiver. The receiver keys 1 and 2 do not have to be set. Their
functions are preprogrammed to access channels 1-4. Receiver channels are
activated as follows:
ACTIVATES
CHANNEL 4
ACTIVATES
CHANNEL 2
1
2
3
4
Channel 4 of the receiver can be
activated by setting keys 3-8 of
coding switch “B” to match keys 3-8
of coding switch “A”. Set keys 1, and
2 of coding switch “B” to on position.
ACTIVATES
ACTIVATES
CHANNEL 1
This product is warranted to the consumer against defects in material and workmanship for one year from the
date of purchase. This warranty applies to first retail buyers of new devices. Warrantor will repair, or at its option,
replace, any device it finds that requires service under this warranty, and will return the repaired or replaced
device to the consumer at the warra ntor’s cos t. For warr anty servi ce and shippi ng instruc tions contact warrantor
at the address shown below. Devices must be sent to warrantor for service at owner’s expense. The remedies
provided by this warranty are exclusive. Implied warranties under state law are to the one year period of this
written warranty. Some states do not allow limitations on how long an implied warranty lasts, so the above
limitation may not apply to you. In order to be protected by this warranty, save your proof of purchase and send
copy with equipment should repair be required. This warranty gives you specific legal righ ts, and you may also
have other rights which vary from state t o state.
All products returned for warranty service require a Return Product Authorization Number (RPA#).
Contact Linear Technical Services at 1-800-421-1587 for an RPA# and other important details.
Linear radio controls provide a reliab le communications link and fill an important ne ed in portable wireless
signaling. However, there are some limitations which must be observed.
For U.S. installations only: The radios are required to comply with FCC Rules and Regulations as Part 15
✶
devices. As such, they have limit ed transmitter power and therefore limi ted range.
A receiver cannot respond to more than one transmitted si gnal at a time and may be blocked b y radio signal s
✶
that occur on or near their operating frequencies, regardless of code settings.
Changes or modifications to the devic e may void FCC compliance.
✶
Infrequently used radio links should be tested regularly to protect against undetected interference or fault.
✶
A general knowledge of radio and its vagaries should be gained prior to acting as a wholesale distributor or
✶
dealer, and these facts should be communicated to the ult i mate users.
This device complies with FCC Rule s Part 15. Oper ation is subject to the following two c onditions: (1) This device
may not cause harmful interference and (2) this device must accept any interference received, including
interference that may cause undesired operation.
Copyright © 1999 Linear Corporation 207408 D
CHANNEL 3
LINEAR LIMITED WARRANTY
IMPORTANT !!!
Channel 4 of receiver can now be
activated by pressing button 1 of the
DT-3+1.
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