Analysis of information sources in references of the Wikipedia article "Control character" in English language version.
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The EOT character terminates the current transmission and returns all terminals in the data-link to control mode. When sent by the transmitting terminal, it indicates that the terminal has nothing more to transmit and is relinquishing the communications line. The receiving terminal can send an EOT character instead of a normal DLE 0, DLE 1, or NAK response. The EOT character in this case is an abort signal that terminates the transmission. When sent in response to a polling operation, the EOT character indicates that the polled terminal has no data to transmit or is unable to continue transmission. An EOT character is recognized (except in Six- Bit Transcode) only when immediately preceded by a SYN pattern (SYN SYN EOT PAD), or when imme- diately preceded by a DLE and followed by a character of which the first four bits must be all "1" bits (PAD character) DLE EOT PAD.
