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C.1. Parallel Interface
C-1
Appendix C
Host Computer Interface
This appendix describes the signals used in the laser printer's parallel, RS-232C/RS-422A
interfaces. It also lists pin assignments, signal functions, timings, connector specifications,
and voltage levels. The RS-232C/RS-422A protocols are also covered. Finally, it explains the
use of the printer in a multi-computer environment.
C.1. Parallel Interface
Parallel interface communication modes
The printer features fast data transmission on the parallel interface. The parallel interface mode
can be activated from the printer's control panel (see Chapter 2, Operating the Page Printer) as
follows:
☛ Use a parallel printer cable that complies with the IEEE1284 standard.
Nibble (high) [default]
High speed data communication is used in compliance with the IEEE 1284 standard. Ordinarily,
you should leave this setting unchanged.
Auto
The printer automatically changes its communication mode to the one the host computer is cur-
rently using.
Normal
The printer uses the communication method discribed by to the normal definitions of the Centron-
ics interface.
High-speed
This mode enables faster data transmission between the printer and the host computer.