Brother HL-2170W - Manual (Page 157)

CHAPTER 4 HP-GL/2 - 6
2. INTRODUCTION
Some of the HL series printers can be used in HP-GL/2 graphics mode to produce vector graphics output
using the commands of the HP-GL/2 graphics language or to print out existing HP-GL/2 format images.
HP-GL/2 is a part of the PCL emulation, which includes graphics command.
The Default plotting measurement unit in the HP-GL/2 graphics mode is 1/1016" ( 0.025 mm).