Nonvolatile memory
The MFP uses nonvolatile memory (NVRAM) to store I/O and print-environment-configuration
information. The contents of NVRAM are retained when the MFP is turned off or disconnected.
HP Memory Enhancement technology
The HP Memory Enhancement technology (MEt) effectively doubles the standard memory through a
variety of font- and data-compression methods.
NOTE The MEt is available only in PCL mode; it is not functional when printing in PS mode.
PJL overview
The printer job language (PJL) is an integral part of configuration, in addition to the standard printer
command language (PCL). With standard cabling, the MFP can use PJL to perform a variety of
functions, such as these:
●
Two-way communication with the host computer through a network connection or a USB device
port. The MFP can inform the host about the control-panel settings, and the control-panel
settings can be changed from the host.
●
Dynamic I/O switching. The MFP uses this switching to be configured with a host on each I/O.
The MFP can receive data from more than one I/O simultaneously, until the I/O buffer is full.
This can occur even when the MFP is offline.
●
Context-sensitive switching. The MFP can automatically recognize the personality (PS 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 MFP in landscape mode, the subsequent print jobs print in landscape only if they are
formatted for landscape printing.
PML
The printer management language (PML) allows remote configuration and status readback through
the I/O ports.
Control panel
The formatter sends and receives MFP status and command data to and from a control-panel PCA.
Scanner interface
The formatter receives data from the scanner to produce copies and to send scanned data in e-mail
format.
116 Chapter 4 Theory of operation ENWW
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