Rolling code: Difference between revisions

Revision as of 16:28, 21 August 2013

Revision as of 16:41, 21 August 2013

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Remote controls send signals in code. When the sending code is the same as the code which is expected by the receiver, then the receiver will actuate the relay, unlock the door, or open the barrier. Remote controls with a fixed code always send the same fixed code. Remote controls with a rolling code (or hopping code) always send out a different code from the one previously sent.

== Typical Rolling code System - KeeloqKeeLoq ==

{{main|KeeLoq}}

The Microchip HCS301 iswas once the most widely used system on garage and gate remote control and receivers,. forThe example,chip BFT / ATA / Nice all employs HCS301 keeloq system to encodeuses the transmitterKeeLoq data,algorithm. we can see theThe HCS301 keeloqKeeLoq system has 66 data bits which consistsconsist of 32a 32-bit serial number, anda 32 -bit rolling datacode, and otheranother 2 bits are used for additional data on oscilloscope.<ref>[http://blog.solidremote.com/post/hcs301-rolling-code-remote-control-on-oscilloscope.aspx "HCS301 Rolling Code Remote Control on Oscilloscope"] Solidremote Blogs</ref>

== References ==