LICAL-ENC-MS001 データシートの表示（PDF） - Unspecified

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LICAL-ENC-MS001

MS Series Encoder Module Data Guide

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Design Considerations

The Linx MS Series encoders and decoders are designed for remote

control applications. They provide an easy way to securely register button

presses or switch closures over a wireless link. The encoder side turns the

status of eight parallel input lines into a secure, encoded, serial bit-stream

output intended for transmission via an RF or infrared link. Once received,

the decoder decodes, error checks, and analyzes the transmission. If the

transmission is authenticated, the output lines are set to replicate the status

of the lines on the encoder.

Prior to the arrival of the Linx MS 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 address lines frequently caused the user confusion when

trying to match a transmitter to a receiver. Another disadvantage was the

possibility that address information could be captured and later used to

compromise the system.

These concerns resulted in the development of a second type of encoder /

decoder that focused on security and utilized encryption to guard

against code cracking or code grabbing. Typically, the encoding of each

transmission changes based on complex mathematical algorithms to

prevent someone from replicating a transmission. These devices gained

rapid popularity due to their high security and the elimination of manual

switches; however, they imposed some limitations of their own. Such

devices typically offer a limited number of inputs, the transmitter and

receiver can become desynchronized, and creating relationships and

associations between groups of transmitters and receivers is difficult.

The Linx product line, which includes the MS and HS Series, is the first

product line to offer the best of all worlds. Both series accept up to eight

inputs, allowing a large number of buttons or contacts to be connected.

The devices also allow relationships among multiple encoders and

decoders to be easily created. Security is well provided for. The MS Series

uses a random fixed word with 224 possible combinations to give a high

level of uniqueness and a reasonable level of security. For applications

requiring the highest security, the HS Series, which employs tri-level,

maximum-security encryption, should be considered.

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