HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 94

Table 20-1 The Vector Group Commands (continued) PA, Plot Absolute Enables movement to absolute coordinate locations (with respect to the origin [0,0]). PD, Pen Down Lowers the "pen" to the page. PE, Polyline Encoded Increases throughput by encrypting common HP-GL/2 commands. PR, Plot Relative Enables movement relative to the current pen location. PU, Pen Up Lifts the pen from the page. RT, Relative Arc Three Point Draws an arc from the current pen location through two relative points. Drawing Lines You can draw lines between two points (X,Y coordinate pairs) using the PD (Pen Down) command and a series of absolute and/or relative coordinate pairs. The printer draws only the portion of the line that falls within the effective window. Note When using HP-GL/2 to draw lines, you can increase your printer's throughput by using the Polyline Encoded (PE) command to send coordinates. The PE command requires that you convert coordinates from decimal to base 64 or 32. This conversion especially increases throughput when using a serial interface. The PE command, with its parameters, is used in place of the PA, PD, PR, and PU commands. 20-2 The Vector Group EN