Section 5. Functional Description; Printing Approach; Normal Printing (10 Cpi) - Honeywell PRU7070 Handbook

Section
5
Functional Description
This section describes some of the functional characteristics of the PRU7070/7071
and the PRU7075/7076 printers employing a 9-needle printhead and providing
100 characters-per-second print speed at 10 or 16.7 characters-per-inch on a 9 x 7
dot matrix (vertical x horizontal).
Printing Approach
The carriage moves continuously during printing, which is started after recep-
tion of a data block. Printing is performed with the logic-seeking approach, which
means that before a line is printed, the printer examines the actual position of the
carriage and finds the left and right limits of the printable characters. Then the
printer makes a decision whether to print forward or backward starting from left
or right. In this way, the carriage movement without printing is minimized, and
the actual throughput can reach higher values according to the actual print pat-
terns. Printing is performed while the carriage is moving with a constant speed
over the line length. Data reception is overlapped with the printing.
Normal Printing (10 CPI)
Character spacing is determined by internal switch setting (see Appendix A).
Normal print character spacing can be changed by software by sending the printer
the appropriate command at the beginning of a printable data line.
10 Characters Per inch
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPGRSTUVWXYZ
1234567890'NM$X&'()=_~A: I\@(()]+;*=(,).?I_
Figure 5-1. ActualIO.OCPISizeandWidth
Functional Description
5-1
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