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

13-16 The PCL Print Model EN
User-Defined Pattern Command
The User-Defined Pattern command provides the means for
downloading the binary pattern data that defines the user pattern.
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C
* c # W [pattern data]
# =Number of pattern data bytes
Default = 0
Range = 0 - 32767 (values outside the range are ignored)
The value field (#) identifies the number of pattern data bytes that
follow the User-Defined Pattern command. In addition to the binary
pattern data, there are eight bytes of pattern descriptor (header)
information included in this pattern data. The format for a 300 dpi
resolution header is shown in Table 13-3, below.
With the introduction of the LaserJet 4 printer, user-defined patterns
can be printed either 300 or 600 dpi resolution. X Resolution and Y
Resolution fields have been added to the header information included
in the previous header. The format for the new header is shown in
Table 13-4, below.
Table 13-3 User-Defined Pattern Header (300 dpi resolution)
Byte 15 - MSB 8 7 LSB-0
0 Format (0) Continuation (0)
2 Pixel Encoding (1) Reserved (0)
4 Height in Pixels
6 Width in Pixels
8 Pattern image
M
Table 13-4 Resolution-Specified User-Defined Pattern Header
Byte 15 - MSB 8 7 LSB-0
0 Format (0) Continuation (0)
2 Pixel Encoding (1) Reserved (0)