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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 specifica-
tions, and voltage levels. The RS-232C/RS-422A protocols are also covered. Finally, it ex-
plains the use of the printer in a multi-computer environment.
C.1. Parallel Interface
Parallel interface communication modes
The printer features the 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 standards.
Auto
The printer automatically changes its communication mode to the one the host computer is
currently using.
Normal
The printer uses the communication method discribed by to the normal definitions of the Cen-
tronics interface.
High-speed
This mode enables faster data transmission between the printer and the host computer.
C.1. Parallel Interface
C-1