WIRELESS MADE SIMPLE
®
4-POSITION RELAY FUNCTION MODULE DATA GUIDE
DESCRIPTION
3.100"
The Relay Function Module is a member of
the Linx pre-certified OEM product line. The
modules have been tested for FCC and
Industry Canada compliance and can be
quickly customized to meet a specific OEM’s
labeling requirements. This greatly reduces
3.200"
the time and expense of bringing an RF-
based product to market. The Relay
Function Modules provide four latched or
1.770"
momentary relay outputs that are capable of
switching external AC or DC powered loads
4.700"
of up to 5 amps. The Relay Modules
5.775"
incorporate a Linx LR Series receiver and an
on-board Holtek decoder IC. Selectable
Figure 1: Package Dimensions
addressing provides security and allows the
creation of 256 distinct transmitter / receiver relationships to avoid unwanted
interaction when multiple systems are in use. When paired with a compatible Linx
OEM Handheld transmitter or transmitter module, the Relay Function Module serves
as a reliable wireless switching device at distances of up to 1,000 feet.
FEATURES
FCC, Industry Canada pre-tested
Wide operational voltage
(5 to16VDC)
Dual power inputs
Long-life relays switch AC or DC
Flange-mount case
Quick-attach heavy-duty device
connectors
256 unique addresses
Can be cosmetically customized
for OEM applications
APPLICATIONS INCLUDE
General Remote Control
Motor Control
Garage / Gate Openers
Lighting Control
Call Systems
Home / Industrial Automation
Wire Elimination
ORDERING INFORMATION
PART #
FCTN-RLY4-315
FCTN-RLY4-418
FCTN-RLY4-433
DESCRIPTION
Relay Function Module - 315MHz
Relay Function Module - 418MHz
Relay Function Module - 433MHz
Revised 1/28/08
ELECTRICAL SPECIFICATIONS
Parameter
POWER SUPPLY
Operating Voltage
Supply Current
RECEIVER SECTION
Receive Frequency Range
FCTN-RLY4-315
FCTN-RLY4-418
FCTN-RLY4-433
Center Frequency Accuracy
Receiver Sensitivity
RELAY CHARACTERISTICS
Arrangement
Switched Power
Relay Switching Voltage
Switched Device Current
Operate Time
Release Time
Life Expectancy
Mechanical
Electrical
Contact Dielectric Strength
(at sea level for 1 minute)
ENVIRONMENTAL
Operating Temperature Range
Storage Temperature Range
–
-40
-45
–
–
+85
+85
–
–
–
–
–
20 million
1x10
-5
@ 5A
30VDC or 250VAC
750Vrms between open
3000Vrms contact-to-coil
cycles
–
–
–
–
–
–
–
–
–
–
–
0.0
0.0
0.6
–
–
SPST
–
–
–
–
–
6.0
3.0
150
1250
30.0
250.0
5.0
–
–
watts
VA
VDC
VAC
A
mS
mS
–
–
–
–
–
–
–
–
–
F
C
–
–
–
-50
-106
315
418
433.92
–
-112
–
–
–
+50
-118
MHz
MHz
MHz
kHz
dBm
–
–
–
–
2
V
CC
I
CC
5.0
12.0
–
–
16.0
170.0
VDC
mA
–
1
Designation
Min.
Typical
Max.
Units
Notes
THEORY OF OPERATION
The FCTN-RLY4-*** module combines
the popular Linx LR Series receiver
with a decoder IC and four relays that
are capable of switching a variety of AC
or DC loads. The Relay Function
Module is designed to receive a
wireless signal transmitted from a
compatible Linx RF module or pre-
certified OEM transmitter. When
transmitted data is received, the data is
presented to the decoder. The decoder
detects the logic states of the DIP
switch address lines, and if they match
the address settings of the encoder, the
decoder’s outputs are set to replicate
the state of the encoder’s data lines.
The relay outputs are then latched on
or off. If momentary operation is
desired, jumper pads J2 through J5 can
be bridged. Figure 3 displays the
location of the pads. Each jumper
corresponds to a relay as shown.
Relay
Jumper
1
J2
2
J3
3
J5
4
J4
Jumper Pads
Figure 3: Jumper Pad Locations
POWER SUPPLY CONSIDERATIONS
The module should be powered from a DC source that is free of noise and high
ripple. The best results are normally obtained using a battery or high quality AC
wall adapter capable of providing the supply currents indicated in the Electrical
Specifications section. Two supply connection options are provided: black
(ground) and red (+) quick-connect terminals or a barrel jack (for a 5.5mm plug,
tip 7 to 16VDC, shell ground). Only one connection should be used at a time and
polarity should be observed.
°
C
°
C
1
1
Notes
1. Characterized, but not tested.
2. For BER of 10
-5
at 1,200bps.
SETTING THE MODULE ADDRESS
The Relay Function Module provides
a total of 256 unique addreses to
avoid contention with other units or
to create unique relationships.
Address selection is made via eight
externally accessible DIP switches
as shown in the adjacent figure.
RELAY FUNCTION MODULE FEATURES
1
1. Antenna
2. DC Power Connector (5 to 16VDC)
3. “Quick-Connect” Alternate DC Input
4. Switched Device Connectors
5. Address Selector DIP Switches
4
3
2
5
Figure 2: Relay Module Features
Page 2
If the switch is on, the address line is
connected to ground, otherwise it is
floating. The transmitter’s address
must match exactly in order for the
Figure 4: Address DIP Switches
units to communicate. Application
Note AN-00300 describes in detail how to set the address to match any of the
transmitters offered by Linx. This application note can be found in the Support
section of the Linx website, www.linxtechnologies.com.
Page 3
A0 = 8
A1 = 7
A2 = 6
A3 = 5
A4 = 4
A5 = 3
A6 = 2
A7 = 1
OFF ON
SWITCHED DEVICE ATTACHMENT
The Relay Function Module features heavy-duty quick-connect block terminals
for attaching the devices to be switched. To use the terminals, press and hold
the button over the entry channel to release the contact. Insert the wire and then
release the button to allow the internal contact to clamp down on the wire.
The terminals accept wire gages from 16 to 26 AWG. Funnel-shaped entry
channels help prevent fraying when using untinned wire. The terminal block is
arranged as shown in the figure below. There is no polarity on the relay terminals
and they may be used in any order (or left unterminated) without internal
damage. Do not attempt to switch loads in excess of the limits listed in the
Electrical Specifications section. The module does not provide internal protection
for shorted loads. Therefore, the designer must provide external protection, such
as fusing, if the possibility of shorting exists.
ANTENNA ORIENTATION
Since the control signals for the Relay Function Module are sent through the air,
the physical orientation of the transmitter and receiver plays a critical role in
determining the overall range of the system. The antenna may be tilted and
swiveled to adjust for maximum range in your environment. In most cases,
orienting the antenna in a vertical position will result in optimum system
performance and the greatest range.
RELAYS
GND
1
2
3
4
5-16VDC
Poor
Optimum
Acceptable
Figure 6: FCTN-RLY4-*** Antenna Orientation
Figure 5: Relay Connection Block
INTERFERENCE CONSIDERATIONS
It is important to remember that the range performance of the modules is heavily
dependent on the environment in which they are operated. The effects of
interference, multipath, and physical attenuation will vary significantly from
location to location.
The Relay Function Module is based on the Linx LR Series RF receiver. These
are simple low-cost devices intended for short-range transmissions. They utilize
OOK AM-based modulation. AM devices can be affected by external noise, such
as that from motors or other sources of broadband RF emissions. Interference
can also come from sources such as paging towers or amateur radio activity.
The designer should carefully test the Relay Function Module in the environment
in which it will be used to ensure that its performance is appropriate for the
chosen application.
The placement of the module in the final product will also affect the range and
performance of the system. If the module is to be placed inside an enclosure,
then the enclosure must be plastic or another non-conductive material.
Otherwise, a hole must be cut into the enclosure to allow the antenna to stick out
as the metal or conductive enclosure will shield the module and it will not be able
to receive a valid transmission. In this case, the antenna should stick straight out
of the enclosure and should not be bent to rest parallel to the metal. This will
detune the antenna and significantly reduce its performance.
The module should be placed in a position to have the widest line-of-sight field
so that the range may be maximized. Typically, the module will be placed on top
of the product to accommodate this, especially when used with machinery.
Remote location of the module’s antenna is not possible as it will invalidate the
FCC testing, so the positioning of the module and its antenna is an important
consideration in the design of the system.
CONTENTION CONSIDERATIONS
An unlimited number of Relay Function Modules may be operated in proximity
without interference, but only one transmitter at a time can be activated within a
reception area. While the transmitted signal consists of encoded digital data,
only one carrier of any particular frequency can occupy airspace without
contention at any given time. If two transmitters are activated in the same area
at the same time, the signals will interfere with each other, so the Relay Module
will not see a valid transmission and will not take any action.
Page 4
Page 5
LABELING REQUIREMENTS
In cases where the FCTN-RLY4-*** module is incorporated inside a product and
its standard labeling is not visible, the end product must be labeled as shown
below.
• The following label shall be affixed in a conspicuous location to any device
previously self-certified under the FCC’s Declaration of Conformity process,
when the product is authorized based on assembly using separately
authorized components and the resulting product does not require additional
testing:
COMPLIANCE REQUIREMENTS
The FCTN-RLY4-*** has been tested by an FCC-approved facility and been
found to comply with all applicable FCC and Industry Canada requirements as of
the date of this document. A Declaration of Conformity (DoC) is on file. It is the
user’s responsibility to consult the FCC or other testing body to determine if any
additional testing may be required on the user’s completed product. In products
where no additional testing is required, further labeling of the unit is not needed
unless the module will be placed inside another housing. It is, however,
necessary to include the following statement in the end product’s instruction
manual or insert card.
Trade Name
Model Number
Assembled From Tested Components
(Complete System Not Tested)
INSTRUCTION TO THE USER
This device complies with Part 15 of the FCC Rules.
Operation of this device is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference
that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, 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
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 receiver.
Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
This equipment has been certified to comply with the limits for a Class B
computing device, pursuant to FCC Rules. In order to maintain compliance with
FCC regulations, shielded cables must be used with this equipment. Operation
with non-approved equipment or unshielded cables is likely to result in
interference to radio and TV reception. The user is cautioned that changes and
modifications made to the equipment without the approval of manufacturer
could void the user’s authority to operate this equipment.
Place the above statement in the instruction manual or insert card.
• When the device is constructed in two or more sections connected by wires
and marketed together, the label is required to be affixed only to the main
control unit.
• When the device is so small, or for such use that it is not practical to place
the statement on the unit itself, the information shown on the label shall be
placed in a prominent location in the instruction manual or pamphlet supplied
to the user or, alternatively, shall be placed on the container in which the
device is marketed. However, the unique FCC logo, device trade name, and
model number must be present on the device.
• The label shall not be a stick-on paper label. The label shall be “permanently
affixed” to the device (meaning the label is etched, engraved, stamped, silk-
screened, indelibly printed on a permanently attached part of the device, or
on a nameplate fastened to the equipment by welding, riveting, or a
permanent adhesive). The label must be designed to last the expected
lifetime of the equipment in the environment in which the equipment may be
operated and may not be readily detachable.
Page 6
Page 7
TRANSMITTERS
The Relay Function Module incorporates a Linx LR Series receiver paired with a
Holtek HT658 decoder IC. This means that there are several options available
for controlling the module.
The first option is to use one of the
pre-certified OEM transmitters offered
by Linx. These transmitters come in
several packages and can be
customized to bear the logo or other
artwork required by the customer. The
only setup required by the customer is
to set the address of the transmitter
and the Relay Module.
There are four OEM transmitters that
can be used with the Relay Function
Figure 7: Pre-Certified Transmitters
Module: the Full Size Handheld, the
Compact Handheld, the Long-Range Handheld, and the Keyfob. The Full Size
Handheld uses the same eight address lines used by the Relay Function
Module, so they only need to be set the same for proper function.
The other three transmitters use all ten address lines offered by the Holtek ICs
while the Relay Function Module uses eight. This means that the last two
address lines on the transmitters (A8 and A9) must be left floating (turn off the
DIP switches on the handhelds, cut traces 8 and 9 on the Keyfob). The other
address lines can be set to whatever the user desires, as long as the transmitter
and the Relay Function Module match.
A custom transmitter can also be created with a KH Series transmitter or an LC
or LR Series transmitter paired with a Holtek HT640 encoder or microprocessor.
Because the Holtek ICs have 10 address lines, the last two lines (A8 and A9)
must be left open. The Holtek address lines are tri-state, meaning that they have
three valid input conditions: high, low, or floating. The Relay Function Module
uses only the low and floating states, so the custom transmitter can only use
these states as well. The lines that are floating should be left open and have no
electrical connection.
It should be noted that the Keyfob
transmitter does not allow full
functionality of the Relay Function
Module. Each of the four relays in
the module uses two data lines for a
total of eight. The Keyfob transmitter
offers a maximum of five buttons, so
at most, it can control two relays in
latched operation and three in
momentary operation.
ONLINE RESOURCES
®
www.linxtechnologies.com
•
•
•
•
•
Latest News
Data Guides
Application Notes
Knowledgebase
Software Updates
If you have questions regarding any Linx product and have Internet access,
make www.linxtechnologies.com your first stop. Our website is organized in an
intuitive format to immediately give you the answers you need. Day or night, the
Linx website gives you instant access to the latest information regarding the
products and services of Linx. It’s all here: manual and software updates,
application notes, a comprehensive knowledgebase, FCC information, and much
more. Be sure to visit often!
www.antennafactor.com
The Antenna Factor division of Linx offers
a diverse array of antenna styles, many of
which are optimized for use with our RF
modules. From innovative embeddable
antennas to low-cost whips, domes to
Yagis, and even GPS, Antenna Factor
likely has an antenna for you, or can
design one to meet your requirements.
RE3
OFF
RE4
ON
RE2
ON
RE3
ON
RE4
OFF
www.connectorcity.com
Through its Connector City division, Linx offers a wide
selection of high-quality RF connectors, including FCC-
compliant types such as RP-SMAs that are an ideal
match for our modules and antennas. Connector City
focuses on high-volume OEM requirements, which
allows standard and custom RF connectors to be offered
at a remarkably low cost.
Page 9
Application
Note
AN-00300
describes in detail how to set the
Relay Function Module address to
Figure 8: Keyfob Button / Relay Relationships
match any of the transmitters offered by Linx. This note can be found in the
Support section of the Linx web site, www.linxtechnologies.com.
Page 8
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