in reply to Re: CRC-16/X25 problem
in thread CRC-16/X25 problem

Mini-Tutorial: Formats for Packing and Unpacking Numbers 

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

[download]

In Section Seekers of Perl Wisdom