HP LaserJet 4 Service Manual - Page 75
RS-422A Serial Configuration LaserJet 4 only
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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. Figure 3-11 RS-422A Cable Pinout 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. Configuration 3-39