Digital Equipment DEClaser 1100 Series, Руководство оператора

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4.5.6.5 Buffer Control (xon/xoff)
The buffer control (xon/xoff) feature uses software to regulate the flow of
data to the input buffer of the printer.
It is sometimes referred to as
software handshaking protocol, a method the printer and the host computer
use to exchange on/off signals. These signals prevent the input buffer from
overflowing with data. If the input buffer becomes full and handshaking is
not enabled, the overflowing data will be lost. Xon/xoff must be enabled in
systems that use this software handshaking protocol to prevent the loss of
data.
4.5.6.6 End of Text/Acknowledge (etx/ack)
The end of text/acknowledge (etx/ack) feature is another type of
handshaking protocol which is used on some systems to prevent data
overflow. The etx/ack feature also uses software to regulate the flow of
data to the input buffer by exchanging signals with the host computer. It is
recommended that this feature be enabled by systems that support etx/ack
to prevent the loss of data.
NOTE: The etx/ack feature is not supported on Digital systems. Use
xon/xoff if you have a Digital system.
4–26 Operator’s Guide