Linx Technologies FCTN-RLY4-xxx-2 - Manual (Page 5)

Page 9 Page 8
TRANSMITTERS
The Relay Function Module incorporates a Linx LR Series receiver paired with a
Holtek-based 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 KH2 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 Holtek-based 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
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