HP 5100tn Printer Job Language - Technical Reference Manual - Page 294
Automatic I/O Switching, Configuration, Context-Sensitive Printer Language Selection, Control Code
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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 settings. 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 (), line feed (), and form feed ().