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Page 8

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

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.

Application

Note

AN-00300

describes in detail how to set the

Relay Function Module address to

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.

Figure 7: Pre-Certified Transmitters

RE3

OFF

RE4

OFF

RE4

ON

RE3

ON

RE2

ON

Figure 8: Keyfob Button / Relay Relationships

ONLINE RESOURCES

• 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.

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.

®

www.linxtechnologies.com