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9.0.0 Serial Printer
9.1.0 THEORY
9.1.1
Introduction
Serial printers produce printed characters by a
series of dots within a matrix. Characters are
formed by printing a pattern of dots that corres-
pond to a stored image in the attachment. The
character pattern is 7-high by 7-wide. The print
head contains eight vertically mounted print
wires; one through seven to print the characters
and the eighth to print an underscore. Signals
from the system move the print head along the
print line and selectively fire the print wires
against the ribbon.
Printer control, power, and data signals are pro-
vided by the system. Printing occurs while the
print head is moving either right or left (bi-
directional). Through variations of moving the
print head and advancing the forms, the system
can make the printer space, line feed, and restore
the print head carrier to the forms loading
position.
Note: To interchange forms between the serial
printer and the belt printer, the maximum
distance from the center line of the left margin
holes to the center line of print position 1 must
be 0.5 inch (12.7 mm) for correct print align-
ment. See Form Design Reference Guide for
Printers, GA24-3488.
The serial printer is available in four models:
120 CPS (characters per second) bidirectional
80 CPS bidirectional
40 CPS bidirectional
40 CPS unidirectional
The two models of the 40 CPS printer are identical.
The attachment circuitry controls whether they
print only left to right or, in both directions. All
four models provide the following capabilities:
•
As many as 128 different characters can be
printed .
• The print line is up to 132 characters long.
•
Horizontal spacing is 10 characters per inch
(25.4 mm).
• Vertical spacing is six lines per inch (25.4 mm).
•
Cut forms are advanced by a 15-inch (381.0
mm) pressure feed platen.
• A forms tractor unit can be attached to print
continuous forms.
• The print head is moved to the left margin and
retracted after two minutes of idle time or
under program control at end of job.
Serial Printer
9-1
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