There are several variations on CRC16 calculation.

Some of the things you should look out for:

1: The polynomial. Although the term CRC16 is supposed to indicate the use
of a specific polynomial (don't have it handy here), many people use the
term CRC16 to refer to _any_ 16-bit CRC calculation.

2: The initial value of the CRC register. Again, CRC16 provides a standard,
but you'll see variations.

3: What bytes are included in the computation. Often some bytes of the
message are _not_ included in the CRC compution.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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