printer control language

printer control language
Name	Printer control language
Type	Page description language
Developers	Hewlett-Packard; Adobe Systems; Xerox; Epson
First appeared	1970s–1980s
File extensions	.PCL, .PS, .PRN
Influenced by	Hewlett-Packard Image; PostScript
Influenced	Printer driver models; Page description languages

printer control language

Printer control language refers to page description and command sets used to instruct printers, print servers, and print spoolers how to render text and graphics on paper and media. It encompasses proprietary and standardized languages developed by major manufacturers and software vendors to define page layout, fonts, raster graphics, and device-specific features. Implementations shaped desktop publishing, network printing, and enterprise document workflows across companies such as Hewlett-Packard, Adobe Systems, Xerox Corporation, Epson, and institutions including International Organization for Standardization.

Overview

Printer control languages provide a bridge between operating systems, applications, and physical printers by encoding page geometry, rasterization instructions, and device control commands. Widely used examples were created by Hewlett-Packard and Adobe Systems to serve diverse hardware including laser printers from Xerox Corporation and inkjet devices from Epson. These languages interact with printer firmware, printer drivers produced by vendors such as Microsoft Corporation and Apple Inc., and network printing services like CUPS on Linux servers. Standards bodies including International Electrotechnical Commission and International Organization for Standardization influenced related raster and imaging standards.

History

Early work on printer command sets emerged in the 1970s and 1980s alongside developments in typesetting and personal computing. Hewlett-Packard introduced control sequences adopted in many DOS-era printers, while Adobe Systems launched a programmable language that revolutionized high-end typesetting and desktop publishing. The rise of laser printers from Xerox Corporation and the proliferation of personal computers from IBM and Apple Inc. drove demand for standardized page description languages. Printer languages evolved as networking and raster imaging advanced through contributions from organizations such as International Telecommunication Union and Institute of Electrical and Electronics Engineers.

Architecture and Syntax

Architectures typically separate device-independent page description from device-dependent rasterization and control. Languages vary from text-based, tokenized command streams to structured, stack-oriented interpreters used in high-end devices. Implementations by Adobe Systems used a postfix interpreter model, whereas solutions by Hewlett-Packard employed escape-sequence token formats optimized for low-memory devices. Syntax elements reference fonts licensed from foundries like Monotype Imaging and ITC, image encodings influenced by Joint Photographic Experts Group, and compression schemes standardized by groups such as MPEG. Printer firmware from manufacturers like Canon Inc. and Ricoh implements parsers that map commands to hardware primitives.

Common Implementations and Variants

Major implementations include proprietary and de facto standard languages from leading vendors. Hewlett-Packard families became ubiquitous in office printers and multifunction devices; Adobe Systems’ programmable language dominated publishing and proofing workflows; Xerox Corporation produced device-optimized variants for enterprise systems. Other vendors—Epson, Brother Industries, Samsung Electronics, Kyocera Corporation—provided firmware-level dialects to exploit specific mechanical capabilities. Open-source projects such as Ghostscript and communities around CUPS contributed converters and interpreters bridging formats. Government printing standards adopted aspects of these implementations in institutional systems overseen by organizations like United States Postal Service printing facilities.

Command Types and Functions

Commands in printer control sets cover text placement, font selection, vector drawing, raster image embedding, media handling, and device configuration. Control sequences manage paper trays and finishing features implemented by hardware vendors including Konica Minolta, Xerox Corporation, and Ricoh; font-related directives reference outline formats by foundries such as Monotype Imaging and Adobe Systems. Graphics primitives often map to device drivers in Microsoft Windows and imaging engines in Adobe Illustrator and CorelDRAW. Error reporting and status queries use device management protocols influenced by Simple Network Management Protocol and enterprise print management systems from vendors like HP Inc..

Device Communication and Drivers

Printer control languages are consumed by device firmware via interfaces such as USB, parallel port, Ethernet, and serial protocols. Operating systems provide driver models—examples include models from Microsoft Corporation for Windows Server and driver architectures used by Apple Inc. in macOS—that translate application draw calls into language-specific command streams. Network printing services and print servers from companies like Novell and products implementing IPP route job data and capabilities. Middleware projects such as CUPS and commercial suites from Xerox Corporation and HP Inc. handle job queuing, rasterization, and filters that convert between languages.

Security and Compatibility Issues

Printer languages have been vectors for vulnerabilities and compatibility challenges across enterprise environments. Malformed command streams can trigger firmware bugs in devices from vendors including HP Inc., Canon Inc., and Epson, leading to denial-of-service conditions exploited in security research by teams associated with academic institutions and industry labs. Backward compatibility between legacy languages and modern RIPs requires converters like Ghostscript and vendor drivers that reconcile differences in font substitution, color management, and finishing options. Compliance and interoperability efforts involve standards organizations such as International Organization for Standardization and procurement policies in institutions including United States Department of Defense.

Category:Page description languages