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4.5.6.6 End of Text/Acknowledge (etx/ack)
The end of text/acknowledge (etx/ack) feature is used with another type
of handshaking protocol 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.
4–30 DEClaser 2100 Printer Operator’s Guide