Mini-Tutorial: Formats for Packing and Unpacking Numbers 

pack "L>", 0xAABBCCDD   # "\xAA\xBB\xCC\xDD"
pack "L<", 0xAABBCCDD   # "\xDD\xCC\xBB\xAA"

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In reply to Re^2: CRC-16/X25 problem by ikegami
in thread CRC-16/X25 problem by bonzi

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