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DESCRIPTION
The D-4B is a handheld four-channel transmitter,
designed to perform four separate functions. this
attractive, lightweight transmitter, operating in
conjunction with four single-channel receivers, or
one multi-channel receiver, can perform a wide
variety of remote switching tasks.
CODE SWITCH LOCATION
The digital coding switch is attached to the circuit
board inside the transmitter. It is located beneath
the small access door on the back of the case
(see Figure 1). To reach the coding switch and
the 9-volt battery, gently pry open t he access
door and lift it off.
CAUTION:
Transmitters and receivers should be
recoded by the installer prior to
installation.
Figure 1. Removing the Battery/Coding Access
Door
In order to avoid the possibility of duplicating
codes in adjacent systems, factory set codes
should not be used. In addition, among the valid
codes available, four other should not be used
because they, also, are too often duplicated.
These include: (1) all keys set to ON; (2) all keys
set to OFF; (3) keys set in alternating ON/OFF
positions; and (4) keys set in alternating OFF/ON
positions.
CODE SETTING FOR FOUR
SINGLE-CHANNEL RECEIVERS
Following is the procedure for coding four
single-channel receivers to a D-4B transmitter.
Use a paper clip or other pointed object (except
a pencil or pen) to set the keys on the di gital
coding switches to the code you select remember the previous caution about coding. Do
not use a pen or pencil; the ink or graphite may
contaminate the switch keys. Note that the D-4B
and each receiver has an eight-position
dipswitch (see Figure 2).
selected on keys 3-8 in the transmitter must
match exactly with the ON/OFF code selected
on keys 3-8 in each receiver.
or OFF positions from left to right (from numbers
3-8). In the example shown in Figure 2, keys 4,
6 and 7 are set to ON; keys 1, 2, 3, 5, and 8 are
set to OFF.
Keys 1 and 2
not connected, they can be set in any
position.
Set each receiver’s switch keys 1 and 2 as
follows:
Receiver #1:
Switch 1 OFF, switch 2 OFF (see
Figure 3)
Receiver #2:
Switch 1 ON, switch 2 OFF (see
Figure 4)
Receiver #3:
Switch 1 OFF, switch 2 ON (see
Figure 5)
Receiver #4:
Switch 1 ON, switch 2 ON (see
Figure 6)
The ON/OFF code
Set keys to ON
in the transmitter are
8
7
6
5
4
3
2
1
O
N
O
F
F
Figure 2. Example
Digital Coding
Switch
Each button on the D-4B will now activate a
separate receiver.
NOTE:
Mount receivers at least 10 feet apart
from each other.
CODE SETTING FOR
FOUR-CHANNEL RECEIVERS
To code a D-4B transmitter with a four-channel
receiver, procede as follows:
Set keys 3 through 8 in the transmitter to
correspond exactly to keys 3 through 8 in the
receiver. Matching these keys completes the
coding procedure required to activate the four
channels. Their functions are programmed to
access channels 1 through four corresponding
with buttons 1 through 4 on the D-4B transmitter.
1 2 3 4 5 6 7 8
O
N
O
F
F
Figure 3. Receiver #1 Coding
CODE SETTING FOR
EIGHT-CHANNEL RECEIVERS
To code a D-4B transmitter with an eight-channel
receiver, procede as follows:
Set keys 4 through 8 in the transmitter to
correspond exactly to keys 4 through 8 in the
receiver.
For the transmitter to activate channels 1 through
4 of the eight-channel receiver, set key 3 in the
transmitter to OFF.
For the transmitter to activate channels 5 through
8 of the eight-channel receiver, set key 3 in the
transmitter to ON.
1 2 3 4 5 6 7 8
O
N
O
F
F
Figure 4. Receiver #2 Coding
1 2 3 4 5 6 7 8
O
N
O
F
F
Figure 5. Receiver #3 Coding
1 2 3 4 5 6 7 8
O
N
O
F
F
Figure 6. Receiver #4 Coding
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CHECKOUT AND TEST
After coding the D-4B transmitter and receiver,
the units should be tested as a system.
The receiver should be powered as
described in the Code Setting and
Installation Instructions pamphlet
enclosed with the receiver. Provision
should be made (with a meter or sounder)
to detect that the correct receiver output
is activated when a signal is received
from the D-4B transmitter.
To test the transmitter, perform the following
steps:
STEP 1:
away from the receiver and press a pushbutton.
Receiver activation indicates that the transmitter
is operating properly and that the
transmitter/receiver’s digital codes are correctly
matched.
STEP 2:
locations. This will help to locate possible null
areas where structural steel, and/or certain
obstacles may interfere with transmission.
If the transmitter fails to activate the receiver, first
check the coding switches to see that the switch
keys in the transmitter and receiver are properly
matched. Next, check the battery and replace it
if it is week. Although the battery should last for
a year with normal use, it is good practice to
install a new battery every six months.
Move the transmitter at least six feet
The transmitter transmits continously
with any button depressed. The red LED
lights during transmission to indicate
batery condition.
Operate the transmitter from various
NOTE:
NOTE:
LINEAR LIMITED WARRANTY
This Linear product is warranted against defects
in material and workmanship for twelve (12)
months. The Warranty Expiration Date is labeled
on the product.
wholesale customers
Linear or through Linear’s normal distribution
channels.
product to consumers.
inquire from their selling dealer as to the nature
of the dealer’s warranty, if any.
obligations or liabilities on the part of Linear
corporation for consequential damages
arising out of or in connection with use or
performance of this product or other indirect
damages with respect to loss of property,
revenue, or profit, or cost of removal,
installation, or reinstallation.
warranties, including implied warranties for
merchantability and implied warranties for
fitness, are valid only until Warranty Expiration
Date as labeled on the product.
Corporation Warranty is in lieu of all other
warranties express or implied.
For warranty service on Linear equipment return
product, at sender’s expense to:
Linear Corporation
5957 Landau Court
Carlsbad, CA 92008
Attention: Repairs Department
This warranty extends only to
who buy direct from
Linear does not warrant this
Consumers should
There are no
All implied
This Linear
IMPORTANT !!!
Linear radio controls provide a reliable
communications link and fill an important need in
portable wireless signalling. 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 limited transmitter power and
therefore limited range.
✶ Receivers may be blocked by radio signals
that occur on or near their operating
frequencies, regardless of code settings.
✶ A receiver cannot respond to more than one
transmitted signal at a time.
✶ 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
ultimate users.
Copyright © 1989 Linear Corporation 203983 A
D-4B
FOUR-CHANNEL
DIGITAL TRANSMITTER
Code Setting
Instructions
A NORTEK COMPANY
2055 Corte Del Nogal
Carlsbad, CA 92009
(619) 438-7000 • (800) 421-1587
CA (800) 321-1845 • FAX (619) 438-7043
Customer/Technical Service: (800) 392-0123
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