HP LaserJet 4v/mv Service Manual - Page 77

Memory Enhancement technology MEt, Protect, PJL Overview

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NOTE Memory Enhancement technology (MEt) The Hewlett-Packard Memory Enhancement technology (Met) effectively doubles the standard memory through a variety of font and data compression methods. MEt is only available in PCL mode; it is not functional when printing in PostScript mode. Page Protect Page complexity (rules, complex graphics or dense text) may exceed the printer's ability to create the page image fast enough to keep pace with the Image Formation process. If Page Protect is disabled, and a page is too complex, it may print in parts (for example, the top half on one page and the bottom half on the next page). Some print data loss is likely in these instances, and the printer will display the 21 PRINT OVERRUN error message. Page Protect allows the Formatter to create the entire page image in page buffer memory before physically moving the paper through the printer. This process ensures that the entire page will be printed. Page Protect applies only to PCL printing. The default setting is Auto. PJL Overview Printer Job Language (PJL) is an integral part of configuration, in addition to the standard Printer Command Language (PCL). With standard Centronics cabling, PJL allows the printer to perform functions such as: • Two-way communication with the host computer through a Bi-directional Parallel connection. The printer can tell the host such things as the control panel settings, and allow the control panel settings to be changed from the host. • Dynamic I/O switching allows the printer to be configured with a host on each I/O. The printer can receive data from more than one I/O simultaneously, until the I/O buffer is full. This can occur even when the printer is off-line. • Context-sensitive switching allows the printer to automatically recognize the personalities (PostScript or PCL) of each job and configure itself to serve that personality. • Isolation of print environment settings from one print job to the next. For example, if a print job is sent to the printer in landscape mode, the subsequent print jobs print in landscape only if they are formatted for landscape printing. PML PML is a Printer Management Language that allows remote configuration and status readback through the I/O ports. Functional Overview 5-15 Functional 5 Overview

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Memory Enhancement technology (MEt)
The Hewlett-Packard Memory Enhancement technology (Met) effectively
doubles the standard memory through a variety of font and data
compression methods.
NOTE
MEt is only available in PCL mode; it is not functional when printing in
PostScript mode.
Page Protect
Page complexity (rules, complex graphics or dense text) may exceed the
printer’s ability to create the page image fast enough to keep pace with the
Image Formation process.
If Page Protect is disabled, and a page is too
complex, it may print in parts (for example, the top half on one page and the
bottom half on the next page). Some print data loss is likely in these
instances, and the printer will display the
21 PRINT OVERRUN
error message.
Page Protect allows the Formatter to create the entire page image in page
buffer memory before physically moving the paper through the printer.
This process ensures that the entire page will be printed. Page Protect
applies only to PCL printing.
The default setting is Auto.
PJL Overview
Printer Job Language (PJL) is an integral part of configuration, in addition
to the standard Printer Command Language (PCL).
With standard
Centronics cabling, PJL allows the printer to perform functions such as:
•
Two-way communication
with the host computer through a
Bi-directional Parallel connection.
The printer can tell the host such things
as the control panel settings, and allow the control panel settings to be
changed from the host.
•
Dynamic I/O switching
allows the printer to be configured with a host on
each I/O.
The printer can receive data from more than one I/O
simultaneously, until the I/O buffer is full.
This can occur even when the
printer is off-line.
•
Context-sensitive switching
allows the printer to automatically
recognize the personalities (PostScript or PCL) of each job and configure
itself to serve that personality.
•
Isolation of print environment settings
from one print job to the next.
For example, if a print job is sent to the printer in landscape mode, the
subsequent print jobs print in landscape only if they are formatted for
landscape printing.
PML
PML is a Printer Management Language that allows remote configuration
and status readback through the I/O ports.
5
Functional
Overview
Functional Overview 5-15