what is soh start of header
In computing and telecommunication, a control character or non-printing character is a code point (a number) in a character set, that does not represent a written symbol. C0 and C1 control codes-Wikipedia. STX-Start of Text-First character of message text, and may be used to terminate the message heading. SOH-Start of Header-First character of a message header. GS-Group Separator-Can be used as delimiters to mark fields of data structures.