32 Line Matrix Printer PCL II Programmer's Reference Manual

Line Spacing

Vertical line spacing of 6 or 8 LPI (lines per inch) can be selected either from

the control panel or remotely using the ESC&l[6 or 8]D sequence. When the

printer is reset, the vertical line spacing is as set from the control panel. If a

parameter other than 6 or 8 is entered, the command is ignored and no line

spacing change is made.

NOTE: Changing the line spacing causes the standard VFC table to be

recalculated.

Vertical Forms Control (VFC)

Vertical forms control (VFC) is a feature which allows increased throughput by

enabling the printer to skip to predetermined print locations. Key page

locations, such as top of form, half form, double space, and triple space, are

referred to as channels (0 through 16) and are stored in a VFC “table.”

The printer has both a standard (computed) VFC and a programmable VFC.

The following paragraphs explain each in more detail.

NOTE: In most situations, the printer's standard (computed) VFC page length

setting, as determined from the front panel, meets the application

requirements. Refer to the

User’s Manual

for information on setting

the page length from the front panel.

Standard (Computed) VFC

The printer VFC uses the logical page and form length (text length) to

calculate the distance to be skipped for each VFC channel. This information is

then loaded into the printer's VFC “table.” The “table” is 16 channels wide and

lines long, where

is the logical page length in number of lines. A VFC

channel contains a 1 in this table on every line it can access. If the VFC

channel cannot access the line, a 0 is placed on that line for that channel. For

example, to specify a skip to the next half form, a program would specify VFC

channel 6. Notice in the sample on page 35 that 1's are placed in the table at

the half form position (lines 1 and 9). Then, for example, if the printer has

finished printing line 2 and channel 6 is selected, the paper will be advanced

to line 9.

To use the standard VFC, perform the ESC&l[0 through 16]V sequence using

the appropriate parameter number listed in Table 7.