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Reading data from DS1982

Category: Software
Product Number: DS1982
Software Version: OneWireViewer

I was trying to read the data from a DS1982.

I managed to read it successfully, but I need to know the equation that produced the second byte of Bytes 

Button (1):

ROM ID: B7 00 00 0A 11 E5 F4 09

BYTES : 08 E3 E6 56 0C C8 E6

Button (2):

ROM ID: 78 00 00 09 46 BA AC 09

BYTES : 50 87 7E 55 54 97 7E