HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 68
PCL Job Control Commands, minimum relative error. For example, a unit selection of 4801 would
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Note The current unit of measure setting affects all PCL Unit moves, horizontal and vertical rectangle size, bitmap and scalable font metrics (how the cursor moves after printing a character). The Unit of Measure command does not affect the interpretation of binary raster data (bitmap fonts, raster graphics or patterns). Once the units of measure is changed, it stays in effect until another is selected or the printer is reset. A control panel or ? E reset returns the current unit of measure setting back to the device default setting (300). The units value is part of the modified print environment. As such, it is saved and restored whenever a macro is called or an overlay invoked, and defaulted when establishing the overlay environment in preparation for an overlay. Values out of range are mapped to the supported value with the minimum relative error. For example, a unit selection of 4801 would be mapped to 7200, since the relative error (0.3332) is less than the relative error when mapped to 3600 (0.3336): --1---4---8---0--7-1-2----0----0-7---2---0---0--- = 0.3332 < --4---8---0---31---6----0---03---6---0---0---= 0.3336 {|4801-7200| over 7200}=0.3332 < {| 4801-3600|over 3600}=0.3336 Figure 4-6 compares a 4-unit vertical and horizontal cursor move with a unit of measure setting of 100 versus 200 units-per-inch. Note that the cursor move distance is halved when the Units per inch is doubled. 4-14 PCL Job Control Commands EN