Decoder Learn More
Learn Mode serves several functions in the HS decoder. First, it provides
the access point for other modes, such as Send Copy, Create Key,
and Clear Memory. It also enables the decoder to learn the Control
Permissions for an encoder. One of the most innovative features of the
MS and HS Series is their ability to establish a unique user identity and
profile for the device containing the encoder. In other products, all encoded
transmissions are either recognized or denied based on the address. In
cases where encoder and decoder addresses match, the state of all data
lines is recognized and output. The HS Series uniquely allows a user or
manufacturer to define which encoder inputs will be acknowledged by each
decoder.
Consider this practical example: a three door garage houses Dad’s
Corvette, Mom’s Mercedes, and Son’s Yugo. With most competitive
products, any user’s keyfob could open any garage door as long as the
addresses match. In a Linx HS-based system, the keyfobs could easily be
configured to open only certain doors (guess which one Son gets to open!)
The decoder is placed into Learn Mode by pulling the LEARN line high and
then taking it low within ten seconds. The decoder will begin toggling the
MODE_IND line to indicate that the decoder is ready to learn the Control
Permissions for a specific encoder. On the encoder end, simply activate
each data line that it will be allowed to access and the decoder will record
the lines that were activated as the Control Permissions. Pull the LEARN
line high again or let the decoder timeout after 17 seconds, after which it
will automatically exit Learn Mode and return to sleep.
The decoder can store up to 15 encoder IDs in memory. If a new encoder
is learned while the memory is full, then the decoder will wrap around and
write the new User Data over the first User Data in memory. The decoder
will flash the MODE_IND line five times as an indication that the memory is
full and the next code learned will overwrite the first. This must be clearly
conveyed to the end user, since system users’ access would be affected
by the overwrites.
If the LEARN line is held high for ten seconds, the decoder will erase all of
the saved User Data from memory. The MODE_IND line will be high for as
long as the LEARN line is high, but after ten seconds, it will go low. Once
the LEARN line is pulled low again, the MODE_IND line will go high for two
seconds to indicate that the memory has been cleared.
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