Usage in Mainframe Computer System Communications Protocols
The EOT character is used in legacy communications protocols by mainframe computer manufacturers such as IBM, Burroughs Corporation, and the BUNCH. Terminal transmission control protocols such as IBM 3270 Poll/Select, or Burroughs TD830 Contention Mode protocol use the EOT character to terminate a communications sequence between two cooperating stations (such as a host multiplexer or Input/Output terminal).
A single Poll (ask the station for data) or Select (send data to the station) operation will include two round-trip send-reply operations between the polling station and the station being polled, the final operation being transmission of a single EOT character to the initiating station.
Read more about this topic: End-of-transmission Character
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