HP LQH-HW 3ULQWHUV manual Graphics Options, Protocols And Emulations

Graphics Options

Graphics Options

The PGL and QMS emulations allow you to create and store forms; generate logos, bar codes, and expanded characters; and create other graphics. Alphanumerics and bar code data are added as the form is printed.

These emulations are available as a customer-installed option. For more information, contact your authorized Hewlett-Packard representative.

Protocols And Emulations

A protocol is a set of rules governing the exchange of information between the printer and its host computer. These rules consist of codes which manipulate and print data and allow for machine-to-machine communication. A printer and its host computer must use the same protocol.

Most impact printers use single ASCII character codes to print text, numbers, and punctuation marks. Some characters, both singularly and in groups of two or more, are defined as control codes. Control codes instruct the printer to perform specific functions, such as underlining text, printing subscripts, setting page margins, etc. The main difference between most printer protocols is in the characters used to create control codes and the ways in which these characters are formatted.

When the printer executes the character and control codes of a particular printer protocol, it is “emulating” that printer. For example, if the printer uses the Proprinter III XL protocol, it is emulating an IBM Proprinter III XL printer; if the printer is using the Epson FX-1050 printer protocol, it is in Epson FX-1050 emulation mode. As used in this manual, “protocol” and “emulation” mean the same thing.

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