HP PCL/PJL reference - PCL 5 Comparison Guide

2-98 Printer-Specific Differences ENWW
Comments:
• MODE. Determines the interpretation mode as follows:
0 Interprets each byte as a character (8-bit mode where
the default row_number equals “0”). Computed
character code is equal to (row_number * 256) + 8-bit
code sent in LB or SM command.
1 Interprets the next two bytes as a character (16-bit
mode). LB and SM commands will read two bytes to
form one 2-byte character code equal to (first_byte *
256) + second_byte. Label terminator and 8-bit control
codes must be preceded by a NULL byte. To turn
symbol mode off while in 16-bit mode, you must send
SM<NULL>; where NULL is ASCII or decimal 0.
2 Same logic as mode 0, except that vertical substitutes
are used if found in a VT segment of the current font.
Characters are rotated counter clock-wise to match the
vertical-rotated printing mode of the Character Text
Path Direction command. Default row_number equals
“0”.
3 Same input logic as mode 1, except that vertical
substitutes are used if found in a VT segment of the
current font. Full width characters are rotated counter
clock-wise to match the vertical-rotated printing mode
of the Character Text Path Direction command.