start of text (control character) (STX)
In character-based control methods, the transmission control character( TC) Start of Text(STX) initiates a related string of characters that is transmitted to the receiver.
The complete characters consist of an alphabet agreed upon by both communication partners.
The STX control character terminates a string that begins with Start of Heading( SOH). The characters used for the control commands shall not appear in the user data to be transmitted. In the code tables, these control characters are used as special characters outside the normal alphabet. In the ASCII character set, the STX control character occupies position 02.