EN Chapter 5 Theory of operation 107
PJL overview
Printer job language (PJL) is an integral part of configuration, in addition to the standard printer
command language (PCL). With standard cabling, PJL allows the printer to perform functions such
as:
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Two-way communication with the host computer through a bidirectional parallel connection. The
printer can tell the host about such things as the control panel settings, and it allows 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 offline.
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Context-sensitive switching allows the printer to automatically recognize the personality (PS or
PCL) of each job and configure itself to serve that personality.
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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
The printer management language (PML) allows remote configuration and status readback through
the I/O ports.
Control panel
The formatter sends and receives printer status and command data to and from a control panel
board.
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