HP Color LaserJet 5500 Technical Reference Manual page 294

Glossary-2
Automatic I/O Switching
Automatic I/O switching allows data to be sent to any of
the printer's I/O ports without reconfiguring the active
I/O port from the control panel.
When the printer is turned on, all I/O ports are enabled
to accept data. The first port to receive data is called
the active I/O port. The active I/O port is the source for
the current print job. All other I/O ports temporarily are
disabled until the next job boundary.
After a job boundary is encountered and there is no
data available from the active I/O port, all the I/O ports
are enabled and checked for available data. The first
port to receive data is the new active I/O port. The other
ports are temporarily disabled, the print job processed,
and then the automatic I/O switching process repeats.
Configuration
Configuration is the process of changing printer set-
tings. The printer is configured using the control panel
or PJL.
Context-Sensitive Printer Language Selection
Context-sensitive printer language selection is a
method of selecting a printer language by looking at
the first portion of a job to discover clues as to which
printer language to use. The syntax differences in each
printer language allow the language to be determined.
Context-sensitive language selection is only operational
if the control panel variable PERSONALITY is set to
AUTO and the print job does not contain a PJL ENTER
command before non-PJL data.
Control Code
A control code is a non-printable ASCII character that
initiates a printer function, for example carriage return
(<CR>), line feed (<LF>), and form feed (<FF>).