HP PCL/PJL reference - PCL 5 Comparison Guide

ENWW Printer-Specific Differences 2-97
Two-Byte HP-GL/2 Support
One-byte applications (which support non-orthogonal rotation,
scaling, and shearing of text) have long been able to use HP-GL/2 to
print to HP LaserJet printers. Two-byte applications have not had this
capability until the introduction of HP LaserJet 5 and 5M printers.
The capability of 2-byte applications (which support non-orthogonal
rotation, scaling, and shearing of text) to print to HP LaserJet printers
using HP-GL/2 is provided by the Label Mode (LM) command.
Label Mode Command
Determines how the Label (LB) and Symbol Mode (SM) commands
interpret characters. Used for printing a 2-byte character set such as
WinJ-DBCS, GB2312, or Big-5.
Syntax:
LM(mode,[row number]:)
Parameter Format
Functional
Range Default
mode clamped
integer
0, 1, 2, or 3 0 (8-bitmode)
row number clamped
integer
0 to 255 0