In example telegrams there a few mistakes in header strings. Using '\'
in strings have special feature to add to string some non-printable
characters, for example to add new line we can add \n for tab \t etc. So
whenever we want to just print backslash as normal character we have to
add another '\' before. In short string "On\\Off" prints "On\Off" ascii
string.
In enquired telegrams there are few strings with \2 sign in header,
'/ISk5\2MT382-1000\r\n' and when we calculate CRC for whole given
telegram part of "..\2.." is interpreted as one character (value 0x02)
instead of two characters ('\', '2').
I think in a header in the example enlosed in P1 DSMR Companion Standard
/ISk5\2.. stand for printable '\' and '2' character instead of
"converted" to special '\2' character.
dunajski