Epson SQ-2550, Руководство пользователя

Страница: 140 / 315

User-defined Characters
Now you have seen how to design a character by placing dots
on a grid and translating the dots to decimal equivalents. The
last step in defining a character is to send this information to
the printer.
Sending information to your printer
The printer loads characters in the print style (Letter Quality,
draft, or proportional) that the printer is currently using. It also
records whether italic or script (either superscript or subscript)
is turned on. This means that if you want to print a character
in the italic mode, for example, you must have the italic mode
turned on when you define the character.
The command your printer uses to define characters is one of
the most complex in its repertoire. The format of the command
is this:
ESC & 0 nl n2 d0
dl d2
data
The ESC & is simple enough. The 0 (which is ASCII code 0, not
the numeral zero in quotation marks) allows for future
enhancements. At this time, it is always ASCII 0.
With your printer, you can define many characters with a sing
command. The values nl and n2 are the ASCII codes of the
first and last characters you are defining. If you are defining
only one character, n1 and n2 are the same. You can use any
codes between 0 and 127 decimal for
nl
and
n2,
but it is best
not to define decimal 0 to 32, which are the codes for control
codes. Also, you can use letters in quotation marks instead of
ASCII numbers for nl and n2.
l e
Software and Graphics
4-25