HP LaserJet 4 Service Manual - Page 6
RS-422A Serial Connection Not available on - memory
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Page 6 highlights
Control Panel Keys 3-2 Reset Menu 3-5 Control Panel Menus 3-6 Printer Features 3-13 Page Protection (HP LaserJet 4 only 3-13 Resource Saving (HP LaserJet 4 Plus and 5 only) . . 3-14 I/O Buffering (HP LaserJet 4 Plus and 5 only) . . . . 3-15 EconoMode (HP LaserJet 4 Plus and 5 only) . . . . . 3-16 Resolution Enhancement (REt 3-16 Memory Enhancement technology (MEt) (HP LaserJet 4 Plus and 5 only 3-17 Density 3-17 Network Security 3-18 Remote Control Panel (DOS 3-18 HP LaserJet Utility (Macintosh 3-18 HP JetAdmin Utility (Novell Networks 3-19 Service Mode 3-20 Setting the Page Count 3-21 Setting the Cold Reset Default 3-22 Cold Reset 3-23 Understanding the PCL Self Test Printout 3-24 Changing the Control Panel Display Language . . . . 3-28 Test Print Button 3-29 System Configuration 3-31 MS-DOS System Configuration 3-31 Parallel DOS Commands 3-31 Serial MS-DOS Commands 3-32 Printer I/O Configuration 3-33 Parallel Menu 3-33 Advanced Functions 3-33 Serial Configuration 3-33 Serial Protocol 3-33 BAUD Rate 3-33 Pacing (Handshaking 3-34 Serial Cable Pin-outs 3-35 DB-9 RS-232 Serial Connection - HP LaserJet 4 . . 3-35 DB-25 RS-232 Serial Connection - HP LaserJet 4 Plus/5 3-36 DB-25 Serial Connection - HP LaserJet 4 . . . . . 3-37 DB-25 RS-232 Serial Connection - HP LaserJet 4 Plus/5 3-38 RS-422A Serial Connection (Not available on the HP LaserJet 4 Plus or 5 printers 3-39 RS-422A Serial Configuration (LaserJet 4 only) . . . 3-39 Modular I/O Configuration 3-40 Contents-2