User-defined Characters
Copying ROM Characters to RAM
After running the program, if you select the user-defined character
set and try to print other characters, the only one that will print is
your arrow. Since no other characters are in the printer’s user-
defined RAM, there is nothing else to print. Other characters sent to
the printer do not even print as spaces; it’s as if they were not sent at
all.
In many cases, you will
want
to redefine only a few of the characters
to suit your needs-the rest of the alphabet will work fine as it is. As
you have seen, it is possible to switch back and forth, at will,
between the normal character set and your user-defined character
set. It is, however, rather inconvenient.
Therefore, your printer has a command that allows you to copy all
of the standard characters from ROM to the user-defined character
set.
The command format is as follows, where the value of n represents
the font family:
E S C : 0 n 0
Note:
This command cancels any user-defined characters you
have already created. You must send this command to the printer
before you define characters.
If you use this command at the beginning of a program, then define
your special characters and select
the
user-defined set, you can print
with the user-defined set as your normal character set. You never
need to switch back and forth between sets.
4-28
Software and Graphics
