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08/2015
Pag 10 of 21
4.2
Rolling code synchronization system
The code transmitted by the transmitted changes at each key activation.
That means that the receiver has to be able to follow the right sequence in order to activate its
outputs.
The code actually transmitted is composed by 3 main blocks:
a manufacturer key
a serial number
a counter number
The manufacturer key is proprietary of the manufacturer and is fixed in each transmitter.
The serial number is characteristic of each transmitter and is set-in-factory by the manufacturer
during the programming of the micro; for this reason, it is different for each transmitter.
The counter number comes from a counter which increments at every activation.
All the above numbers once assembled are encrypted and then sent to the modulator.
The synchronisation system operates as follows:
32768
65525
0
128
Once the serial number of the transmitter has been stored into the receiver memory, is the counter
number received and the counter number of the receiver differ for less of 128 the receiver updates
its counter and enable the output.
If the difference between the two counter numbers is greater than 128 but less than 32768, the
synchronisation can occur only after 2 consecutive received counter numbers ( that means two
close transmissions without any error of the transmitter).
The device is approved by the FCC and it complies with Part 15 of the FCC Rules.
Its operation is subject to the following 2 conditions:
1. This device may not cause harmful interference.
2. The device must accept any interference that may cause undesired operation.