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3-42 Printer Operation
Pacing (Handshaking)
Pacing (or “handshaking”) is a type of communication between the
printer and the computer. This is an important setting in the printer
because it allows the printer to tell the computer when to send
information. If the printer is unable to receive information, for
example, when the print buffer is full or when the printer is out of
paper, a signal is sent to the computer to stop sending information.
When the printer is able to resume receiving information, it sends
another signal to the computer to send more data.
Pacing is set through the Control Panel’s I/O Menu. Two types of
handshaking are supported by the printer:
●
Select
DTR/DSR
through the I/O Menu’s
PACING
item if the
computer requires hardware flow control (most personal
computers do). Through the I/O Menu’s
DTR POLARITY
item, the
DTR polarity can be set to High or Low. The default is
DTR
POLARITY=HI
.
●
Select
XON/XOFF
through the I/O Menu’s
PACING
item if the
computer requires software flow control (for example, if you are
using a UNIX workstation). Note that status readback messages
are not paced when
XON/XOFF
is selected. Through the I/O
Menu’s
ROBUST XON
item, Robust Xon can be set to
ON
(the
default) or
OFF
. Note that the
ROBUST XON
item only appears
under the I/O Menu if
XON/XOFF
is selected.