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Remote Control Overview
Wireless remote control is growing in popularity and finding its way into
more unique applications. Remote Keyless Entry (RKE) systems for
unlocking cars or opening garage doors quickly come to mind, but how
about a trash container that signals the maintenance office when it needs
to be emptied? The idea behind remote control is simple: a button press or
contact closure on one end causes some action to be taken at the other.
Implementation of the wireless RF stage has traditionally been complicated,
but with the advent of simpler discrete solutions and modular products,
such as those from Linx, implementation has become significantly easier.
Encoder and decoder ICs are generally VCC
employed to maintain the security
and uniqueness of a wireless RF or IR
link. These devices encode the status
of inputs, usually button or contact
closures, into a data stream
suitable for wireless transmission. Upon
ENC
HS
Series
Tx
LR
Series
successful recovery and
validation, the decoder’s outputs are set
to replicate the states of the
encoder’s inputs. These outputs can
Rx
LR
Series
DEC
HS
Series
GND
then be used to control the circuitry
Figure 11: Remote Control Block Diagram
required by the application.
Prior to the arrival of the Linx HS Series, encoders and decoders
typically fell into one of two categories. First were older generation,
low-security devices that transmitted a fixed address code, usually set
manually with a DIP switch. These products were easy to use, but had
significant security vulnerabilities. Since they sent the same code in every
transmission, they were subject to code grabbing. This is where an
attacker records the transmission from an authorized transmitter and then
replays the transmission to gain access to the system. Since the same
code is transmitted every time, the decoder has no way to validate the
transmission.
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