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RS-422A Serial Connection (Not available on the HP
LaserJet 4 Plus or 5 printers)
If you are configuring the computer to use an RS-422A serial port,
you need a special cable. Contact the computer or printer network
manufacturer to see if an RS-422A cable is available. If no cable
is available, contact your computer manufacturer for your
computer pin assignments and have a cable constructed.
RS-422A Serial Configuration (LaserJet 4 only)
The default configuration for the serial port on the printer is for
RS-232C serial communication. To set the printer to use RS-422A
serial communication, change the control panel Serial Menu’s
SERIAL setting to SERIAL=RS-422.
Note
Hardware pacing for RS-422 serial
communication is not available on the printer.
Figure 3-11 RS-422A Cable Pinout
Configuration 3-39