HP LineJet Printers - PCL-II/LinePrinter Plus Technical Reference Manual, 171249-001PX

Self-test
71
Self-test
(PCL Level I)
ESCz prints the PCL-II configuration report, which shows available character
sets, symbol sets, bar codes, etc.
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
n lines long, where n 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 67 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[0-16]V sequence using the
appropriate parameter number listed in Table 12.
Stroke Weight (Bold)
The Stroke Weight command designates the thickness of the strokes that
compose the characters of a font.
ESC(s#B Primary stroke weight
ESC)s#B Secondary stroke weight
The value field (#) must be 0 for standard stroke weight, or 3 for bold stroke
weight.
Switching Character Fonts
Character fonts can be accessed using the Shift In/Shift Out (SI/SO) control
codes.
The SO (CTRL N) control code is sent to the printer to access the secondary
font; the SI (CTRL O) control code is sent to select the primary font.