Epson SQ-2550, User Manual

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User-defined Characters
There is one restriction in designing characters. Dots in the
same row may not print in adjacent columns. That is, there
must be an empty dot position to the left and to the right of
each dot that prints. This is true in draft, Letter Quality, and
proportional.
Defining your characters
The first step in defining characters is to place the dots on a
grid just as you want them to print. The examples here, like the
ones in the graphics section, use an X to represent each dot.
In the illustration below, you see a draft grid with a simple
user-defined character planned on it.
Now you translate the dot pattern you’ve created on paper to a
numeric format so you can send the information to your
printer. Every dot has an assigned value. Each vertical column
which has a maximum of 24 dots is first divided into three
groups of eight dots. Each group of eight dots is represented
by one byte, which consists of eight bits. Hence, one bit
represents one dot.
Software and Graphics 4-23