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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 that manipulate
and print data and allow for machine-to-machine communication. A printer
and its host computer must use the same protocol. As used in this manual,
protocol and emulation mean the same thing.
Most impact printers are single ASCII character codes to print text, numbers,
and punctuation marks. Some characters, both singularly and in groups are
defined as control codes. Control codes instruct the printer to perform specific
functions, such as underlining text, print 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. If the printer uses the Proprinter
III XL protocol, for example, it is emulating an IBM ® Proprinter III XL printer. If
the printer is using the Epson FX printer protocol, for example, we can also
say it is in Epson FX emulation mode.
There are additional emulations that are provided as optional features, such
the Code V and IGP emulations. For additional information, refer to "Code V
Feature (VGL)" on page 209 and "IGP Feature (PGL)" on page 203.
Graphics Enhancements
The PGL and Code V emulations allow you to create and store forms,
generate logos, bar codes, expanded characters, and create other graphics.
Alphanumeric and bar code data are added as the form is printed.
These emulations are available as factory-installed or field-installed options.
For more information, contact your authorized service representative.
Taking Care Of Your Printer
Your printer will produce high print quality jobs if it is well taken care of.
Periodic cleaning, handling the printer properly, and using the correct printer
supplies such as paper and ribbons ensures optimum performance. Chapter
6 explains how to clean the printer, and printer supplies are listed in Appendix
A.
Whenever it is necessary to service the printer, remember these important
maintenance concepts:
•
Use only the ribbons specified in Appendix A. Use of incorrect ribbons
can lead to ink migration problems, degraded print quality, and expensive
damage to the printer.
•
Incorrect closure of the forms thickness lever can lead to smearing,
degraded print quality, paper jams, and damage to the platen and shuttle
assembly. Never close the forms thickness lever too tightly.
Protocols And Emulations
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