HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part II

EN SV, Screened Vectors 22-41
For Type 22, the optional parameter selects the corresponding PCL
user-defined pattern specified by way of the
?*c#W command.
Option1 specifies the pattern associated with the user-defined fill
pattern. Option2 is ignored if present. See “User-Defined Pattern
Graphics” in Chapter 13 for a discussion of PCL user-defined
patterns.
All parameters are optional. If all parameters are omitted, screening is
turned off (the vectors are solid).
If screen_type is present, but option1 and/or option2 are omitted,
values previously specified for the specified screen_type are used.
If none have been specified since the last power-on, IN, DF, or ?E
Reset, the defaults are assumed.
All screening patterns use the current anchor corner (see the AC
command description).
Table 22-22
Related Commands Group
AC, Anchor Corner The Line and Fill Attributes Group
FT, Fill Type
PW, Pen Width
RF, Raster Fill Definition
WU, Pen Width Unit Selection
Table 22-23 POSSIBLE ERROR CONDITIONS:
Condition Printer Response
1 or more parameters ignores parameter