ali hadim wrote: > Hello all , > I'm trying UCP Format text and I learned a lot but I have not > understand someting This is example.: "FC" is Checksum and What is > the checksum and what is the rule?
This is explained clearly in the UCP manual. The <checksum> is derived by the addition of all bytes of the header, data field separators and data fields (i.e. all characters after the stx-character, up to and including the last "/" before the checksum field). The 8 Least Significant Bits (LSB) of the result is then represented as two printable characters. The character containing 4 Most Significant Bits (MSB) (of those 8 LSB) shall be transmitted first. For example, if the checksum is 3A(hex) the representation shall be the characters "3" (33(hex)) and "A" (41(hex)). -- Ian Cass
