Functional Overview
Formatter System
PJL Overview
Printer Job Language (PJL) is an integral part of configuration, in
addition to the standard Printer Command Language (PCL). (See
“PJL Software Commands” in Chapter 3 for more information.)
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 set from the host.
● Dynamic I/O switching (LaserJet 4ML/4P/4MP) 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
buffer is full. This can occur even when the printer is offline.
Note
The Serial and LocalTalk I/Os share the same
softare interrupt. Thus, dynamic 1/0 switching
is limited to switching between the parallel
interface and one other I/O interface selected
from serial and LocalTalk.
●
●
Context-sensitive switching (LaserJet 4ML/4P/4MP only)
allows the printer to recognize automatically the personalities
(PostScript or PCL) of each host 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.
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