Checksum Crc - AEG ARE H9 HF User Manual

7.3 Checksum CRC

The check sum (CRC=cyclic redundancy check) is generated using the
standardized
ISO-Polynomial (or CRC-CCITT) 0x1021; P(X) = X
CRC-CCIT Polynom
CRC order
Initial CRC-value
data stream
CRC
---------------------------------------------------------------33/51---------------------------------------
16 12 5
+ X + X + 1 .
0x1021
16 Bit
0x0000
reverse each data byte (process from LSB to MSB)
reverse CRC result before final XOR