HP 4 FAMILY - Manual (Page 134)

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
2-98 Printer-Specific Differences