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It is often used in conjunction with Start of Text (STX) [1] and Data Link Escape (DLE), e.g., to distinguish data frames in the data link layer. All this use is pretty much obsolete, except in modem communication (AT command set). [2] In both ASCII and EBCDIC, ETX is code point 0x03, often displayed as ^C, and a (ASCII) terminal can send it by ...
In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...
The start of text character (STX) marked the end of the header, and the start of the textual part of a stream. The end of text character (ETX) marked the end of the data of a message. A widely used convention is to make the two characters preceding ETX a checksum or CRC for error-detection purposes. The end of transmission block character (ETB ...
Start of Text: STX U+0003 End-of-text character: ETX U+0004 End-of-transmission character: EOT U+0005 Enquiry character: ENQ U+0006 Acknowledge character: ACK U+0007 Bell character: BEL U+0008 Backspace: BS U+0009 Horizontal tab: HT U+000A Line feed: LF U+000B Vertical tab: VT U+000C Form feed: FF U+000D Carriage return: CR U+000E Shift Out: SO ...
In teleprinter systems, the sequence "NNNN", on a line by itself, is an end of message indicator. In several Morse code conventions, including amateur radio, the prosign AR (dit dah dit dah dit) means end of message. In the original ASCII code, "EOM" corresponded to code 03 hex, which has since been renamed to "ETX" ("end of text"). [3]
ISO 1745:1975 Information processing – Basic mode control procedures for data communication systems is an early ISO standard defining a Telex-oriented communications protocol that used the non-printable ASCII transmission control characters SOH (Start of Heading), STX (Start of Text), ETX (End of Text), EOT (End of Transmission), ENQ (Enquiry), ACK (Acknowledge), DLE (Data Link Escape), NAK ...
Yes, you should say *something.*
The content of the heading is not defined by the protocol but is defined for each specific device. The heading, if present, is preceded by an SOH (start of heading) character and followed by an STX (start of text). [4] Text data normally follows the heading, begun by the STX, and terminated by ETX (end of text) or ETB (end transmission block).