The protocol that the SC5272 chip is one of the kind that accepts some address and data inputs and generates a 12-bit protocol using different ON/OFF signal patterns.
This chip allows 3 different states per bit.
From the datasheet you can see that the sync code is sent after the data bits and the whole protocol is sent 3 times in a row. Therefore other protocol definitions with a starting sync code may conflict. E.g. see intertechno-old protocol.
There are also very similar chips like the PT2264 on the market that also send these kind of signals and you can find also derivations of this protocol.
From the manual you can find 4 different codes in use:
| Code | timing ratio |
|---|---|
| bit '0' | 4 : 12 : 4 : 12 |
| bit '1' | 12 : 4 : 12 : 4 |
| bit 'f' | 4 : 12 : 12 : 4 |
| sync bit | 4: 124 |
These rations need to be multiplied by a base timing that varies.
The SC5272 protocol can be added to the signal parser by calling sig.load(&RFCodes::sc5)
The baseTiming of 100 µ seconds is a good starting point but may be adjusted in the protocol definition.
[sc5 0000f0000fffS]
[sc5 0000f0000ff0S]
- SC5272 datasheet https://old.domotronic.fr/telechargement/SC5272S-L4datasheet.pdf
- PT2264 datasheet http://www.princeton.com.tw/Portals/0/Product/PT2264_1.pdf