Epson 4500 - Manual (Page 120)

Graphics
The Graphics Command
The graphics mode command is quite different from the other
commands used by the printer. For most of the other printer modes,
such as emphasized and double-wide, one ESC code turns the mode on
and another turns it off. For graphics, the command is more
complicated because the code that turns on a graphics mode also
specifies how many columns it will use. After the printer receives this
code, it interprets the numbers that follow as pin patterns and prints
them on the paper.
Your printer has one command that allows you to use any of the
11
graphics options. The format of the command is:
ESC * m n1 n2 data
In this command, m selects the graphics option and n1 and n2 specify
the number of columns to reserve for graphics. The available graphics
options are listed below:
* Adjacent dots cannot be printed in this mode.
Software and Graphics 4-13