Using Hp-Gl/2 Color Mode - Brother HL-1070 - B/W Laser Printer Technical Reference Manual

Black reference for value #1, #2, #3
This mode specifies the black value (the highest level of density).
Each value indicates a color as follows;
#1: red
#2: green
#3: blue
Range: -32767 ~ 32767
When the encoding mode is 2 or 3, this setting is valid.
2.3.

Using HP-GL/2 Color Mode

Two methods are provided to set the color mode in the HP-GL/2 mode. Set the color mode by the PCL
command, then transfer to the HP-GL/2 mode. Execute the NP command.
For the details on how to use the color selections in the HP-GL/2 mode, refer to Section 6 'HP-GL/2'.
CHAPTER 3 "PCL5C" - 9
2001/10/02