32 Line Matrix Printer PCL II Programmer's Reference Manual

Raster Graphics

Graphics are sent to the printer using the following escape sequences:

ESC*t[70, 140]R Raster graphics resolution

ESC*r#L Horizontal raster graphics resolution

ESC*r#V Vertical raster graphics resolution

The ESC*r#L and ESC*r#V escape sequences allow you to set the horizontal

and vertical raster graphics resolutions independently. Valid raster graphics

resolutions are 70 DPI by 72 DPI, 140 DPI by 72 DPI, 70 DPI by 144 DPI, and

140 DPI by 144 DPI. The following table lists the graphics resolution and the

corresponding escape sequence used to select that graphics resolution.

There are many different valid ways to select a given graphics resolution. The

following table lists only one of the many valid ways.

The ESC*t#R escape sequence allows you to select a graphics resolution of

either 70 x 72 dots per inch (default) or 140 x 144 dots per inch (high

resolution). For example, to specify high-resolution, you would send the

ESC*t140R escape sequence to the printer. Using the standard resolution,

the maximum amount of graphics data that can be printed is 115.5 bytes

versus 231 bytes for high-resolution.

ESC*rA Prepare for raster graphics (PCL Level I)

ESC*b[

# of bytes

] W[

binary data

] Raster data transfer (PCL Level I)

ESC*b[

# of raster lines

]Y Move paper # number of raster lines

ESC*rB Raster graphics complete (PCL Level I)

The ESC*rA sequence informs the printer that a raster graphics dump is to

follow the sequence. If the printer has received a partial line of ASCII data

before this sequence is received, this escape sequence causes the ASCII

data to be printed and a carriage return and line feed to be performed.

The ESC*b#W[binary data] sequence actually sends the raster data to the

printer. This escape sequence must be sent for each raster line to be printed.

The # of bytes parameter is the decimal number of bytes of binary graphics

data to be sent to the printer. The binary data consists of a 1 for every dot to

be printed and a 0 for every blank space.

Table 9. Graphics Resolution

Horizontal DPI Vertical DPI Escape Sequence

70 72 ESC*r70l72V

140 72 ESC*r140l72V

70 144 ESC*r70l144V

140 144 ESC*r140l144V