- Personal Printer Data Stream
Personal Printer Data Stream is a general name for a family of
page description languageused by IBM printers, which includes all Proprinter, Quietwriter, Quickwriter, LaserPrinter 4019 and 4029 commands.
PPDS is introduced to control printers in 1981 with the launch of IBM Graphics Printer 5152. Originally called IBM ASCII, Proprinter, Quickwriter, or Quietwriter data stream, the name was changed to PPDS when the IBM LaserPrinter was introduced in 1989.
PPDS has different level of functions that are all upward compatible. Although many laser or inkjet printers do not support PPDS, those that support binary printer languages still use the ESC syntax, which include
Printer Command Languageversions 1 to 5, Epson ESC/P command set.
Level 1 is the basic level of PPDS, providing the basic services needed by any printer. This level is represented by the 9- and 24-pin Proprinter family of printers. Within this level, the typical differences among the printers are as follows:
*Font Selection: The basic set of 10, 17.1 and 12 CPI is supported
*Raster Graphics: Top image resolution was up to 72x240
Level 2 incorporates enhancements in the font selection, print quality selection and paper handling. This level is represented by the Quietwriter and Quickwriter family of products. The following commands enable you to use these enhancements:
*Select Font Global: Allows the IBM font global identifier to select fonts
*Select Code page: Allows the IBM code page identifier to select the code page or character set
*Page Presentation Media: Allows cut sheet and envelope feeding from one or more sources
*Space Forward and Backward: Allows easier text justification
Level 3 provides enhancements to the previous PPDS levels for page type printers, such as the IBM LaserPrinter 4019. The enhancements are:
*Cursor positioning: Allows you to place text and images at any position on the page
*Save and Manage Macros: Allows you to work with forms overlays and repetitive command sequences
*Rule and Fill: Allows you to fill drawings with different patterns
*Page orientation: Allow changing the page's orientation.
Level 4 adds new features of the IBM LaserPrinter 4029 to the previous PPDS levels. These features include compression, scalable fonts, and enhanced orientations.
*Comprehensive Font Selection: Added the support for scalable fonts
*Set Print Angle: Adds support for different angles
PPDS vs. PCL 1-5
Both languages define different printable areas for a given physical medium. PCL and PPDS use different characteristics or orders when searching for a substitute font. PCL uses ASCII-encoded numerical values as command parameter, while PPDS uses binary encoded parameter.
Modern printer support
Several modern Lexmark printers (an example would be the Lexmark E450dn) still support PPDS Level 4 in order to provide a high level of support for legacy applications which were writtenspecifically for IBM 4019 and 4029 laser printers.
* [http://downloads.lexmark.com/cgi-perl/downloads.cgi?ccs=37:1:0:37:0:0&emeaframe=&fileID=573&searchLang=en&searchLang=en White Papers: Lexmark Printer Data Streams] Contains history of PPDS and other languages.
* [http://www.lexmark.com/publications/pdfs/form2400/en/enTref.pdf Lexmark Forms Printer 248x/249x Technical Reference] Contains a subset of PPDS commands.
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