Tally Genicom T5023+ - Manual (Page 192)

Important notes on document processing Additional commands (Printer)
182 T5023/5023+ - Programming Guide
Definition 2:
The reference line for vertical positioning on the document printer is the base line
(needle 20). The distances between print characters and reference lines above
and below the print characters specified in this manual always refer to this base
line.
For measurements of the left and right character box limits, print characters are
recommended which extend from the left to the right edge of the character box
(for example, continuous horizontal bar (hex 2D) or block graphics characters).
Capital letters are recommended for measuring the base line.
Horizontal positioning
When positioning the print head horizontally, a logical distinction must be made
between the horizontal leading edges on the left and on the right.
For application programming, the difference is that for the horizontal positioning
on the document or passbook with the horizontal leading edge on the right, the
print positions of the document in question must be converted to the print positi-
ons of the printing unit, therefore the physical width of the printing unit and of the
document must be taken into consideration. If leading spaces are necessary in
a print line, the left margin can be set as required (ESC l (n)).