HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 128

Note Because SP is not allowed in polygon mode, if you select a pen within PE while in polygon mode, the Select Pen command is ignored. z Value - Specifies data according to the preceding flag. For example, a value following a select-pen flag should be a pen number. Flag values are encoded in the same manner as coordinate data. Instructions for encoding flag values follow the parameter descriptions. z Pen Number - Specifies the pen to be selected (black [1] or white [0]). The pen number must be encoded into a base 64 or base 32 equivalent. z Number of Fractional Binary Bits - Specifies the number of fractional binary bits contained in the coordinate data. The number of fractional binary bits must be encoded into a base 64 or base 32 equivalent (see the explanation on the next page). Table 20-23 Value Format Range1 pen number integer 0 to 1 number of fractional binary bits integer -26 to 26 1. PR and PE have extended ranges of -230 to 230 - 1 plotter units. If the current pen position goes out of this range, the printer ignores plotting commands until it receives an absolute PA or PE coordinate within the extended ranges. z X,Y Coordinates - Specifies a coordinate pair encoded into a base 64 (default) or a base 32 equivalent. Use base 64 if your system can send 8 bits of data without parity. Use 7-bit mode and base 32 coordinate values if your system requires a parity bit. z When you are in symbol mode (refer to the SM command in Chapter 22, The Line and Fill Attributes Group), PE draws the specified symbol at each X,Y coordinate. When you are in polygon mode (refer to the PM command in Chapter 21, The Polygon Group), the X,Y coordinates enter the polygon buffer; they are used when the polygon is edged or filled. 20-36 The Vector Group EN