As a job prints, the printer controller maintains both the logical position and thephysical position on the page. If a print job does not end with a proper jobterminator (for example, Form Feed), then:v All data for the current page may not printv The next print job may be misaligned on the formv Residual data from a previous job could print with the new job.Page PresentationMany Epson ESC/P commands (tabs, margins, line spacing, for example) aredescribed in terms of the presentation surface. A presentation surface is atwo-dimensional surface upon which the printer positions symbols according tocontrols embedded in the incoming data stream. The presentation surface isdefined in absolute terms by the width and depth parameters of the page sizecontrol commands (Set Page Length, Set Horizontal Margins, for example). Thephysical print position does not move outside the range of these two parameters.The left margin (LM) and right margin (RM) are variable parameters within thepresentation surface. The logical print position does not move outside the range ofthe vertical margins nor outside the horizontal margins + 1. The following figureshows the presentation surface and the relationships of some of these parameters.CPP Current Print Position (LM ≤ CPP ≤ RM)CPL Current Print LineTOF Top of FormLM Left MarginC P L = 1nnLM RMPhysicalPageCPP = 1PLTOFSOP218 4247 Printer Model A00 User’s Guide
