HP PCL/PJL reference (PCL 5 Color) - Technical Reference Manual

D-12 Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) EN
The byte-aligned binary data field (shown as ASCII for clarity) would
be:
Note Do not use downloaded dither matrices as patterns since the
orientation of the pattern will not rotate with changes in orientation
and page rotation.
Note HP Color LaserJet 5 and 5M printers do not support the Download
Dither Matrix command. When this command is sent, the printer
parses and discards the matrix data. The printer selects the
Continuous Tone Smooth 150 lpi algorithm instead.
Byte 15 (msb) 8 7 (lsb) 0 Byte
00 1 1
20 4 3
40 4 5
6B0 B1 7
8B2 B3 9
20 B14 B15 21