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E
Serial Pin-out and Cabling Configuration
Serial Communication
Serial communication is simply the transmission of data one bit at a time.
With just one bit to transmit at a time, data can be transferred with a simple
electrical circuit consisting of only two wires. In this fashion an eight bit
byte is transmitted one bit at a time and the individual bits are reassembled
into the original byte on the receiving end. Bit transmission occurs from
the least significant bit to the most significant bit.
Data Terminal
Equipment (DTE)
Transmit on pin 2 and receive on pin 3. A printer is typically a DTE device.
Data
Communications
Equipment (DCE)
Transmit on pin 3 and receive on pin 2. A modem is typically a DCE device.
Asynchronous
Communication
Asynchronous communication or start/stop transmission is the concept of enclosing a character
with a start and stop bit. The RS-232 specification defines the standards for asynchronous serial
communication.
Parity Parity is a method of error checking in which a bit is added to keep the number of bits in a
character even or odd depending upon whether or not even or odd parity is used.
HP LaserJet Serial
Data Format
Transmission is asynchronous, with one start bit, eight data bits and one stop bit. Parity is not
used. HP LaserJets are DTE devices.
Serial Interface
Protocol
(handshaking)
Handshaking is the method in which the flow of data between two devices is controlled. The two
methods of flow control that are used by HP LaserJet printers are software flow control, in which
one device controls another by the content of the data and hardware flow control, in which one
device can control another by changing the voltage on a wire.
Software Flow
Control (software
handshaking)
Xon/Xoff is a data stream handshake protocol which sends Xon (DC1; 11 Hex) to the computer
from the printer’s transmit data pin when the printer is able to accept data and sends Xoff (DC3; 13
Hex) when the printer is not ready for data.
Hardware Flow
Control (hardware
handshaking)
By definition hardware handshaking is performed when two programs manipulate RS-232 control
pins-DTR, DSR, RTS, and CTS to achieve a hardware-based form of flow control. In DTR/DSR
handshaking, the sender asserts DTR (Data Terminal Ready) before sending the first character in
a stream of data and waits for DSR (Data Set Ready) to be asserted in return. RTS/CTS
handshaking is similar, but uses the Request To Send and Clear To Send pins rather than Data
Terminal Ready. In either case, the sender delays transmitting data until the receiver is ready.
EN Serial Pin-out and Cabling Configuration E-1
- User’s Manual 5
- Network Security 7
- ASCII PJL Escape Sequence 8
- Conventions 9
- Supplementary Documents 10
- Contents 11
- Printing 12
- PostScript Printing 12
- Adjusting Print Quality 12
- About Your Printer 15
- HPLaserJet 5 Printer Features 16
- ENERGY STAR Computers award 17
- EtherNet networks 18
- 1-4 About Your Printer EN 18
- Accessories and Options 19
- 1-6 About Your Printer EN 20
- Ordering Information 21
- HPLaserJet Printer Parts 22
- About Your Printer 1-9 23
- 1-10 About Your Printer EN 24
- Printing Software Overview 25
- Software for MS Windows 26
- MS Windows Status Utilities 27
- HP JetPrint 28
- HP FontSmart 28
- Network Management Utilities 29
- Software for DOS 30
- Remote Control Panel 31
- Software for Macintosh 32
- Optional Software 33
- Control Panel Layout 36
- Control Panel Menus 38
- Using the Control 39
- Printing Menu 40
- Item Options Explanation 41
- PCLFonts Menu 42
- PostScript Menu 43
- Job Menu 44
- Configuration Menu 45
- Memory Configuration Menu 47
- Parallel Menu 48
- Serial Menu 49
- Resets Menu 50
- Test Menu 51
- Preparing for Printing 54
- EN Printing 4-3 55
- Media Input Options 56
- Optional Media Inputs 57
- Loading Tray 2 58
- Loading Tray 1 59
- Printing Tasks 60
- Manually Feeding Pages 61
- Media Size Designations 62
- Printing on Special Media 65
- Tray 1 Letterhead Orientation 67
- Tray 2 Letterhead Orientation 67
- Printing Envelopes 68
- Label Guidelines 70
- Transparency Guidelines 70
- WARNING! 72
- Figure 4-7 72
- 500-Sheet Tray 3 Details 73
- Specifying a Duplex Setup 76
- Figure 4-10 77
- 4-26 Printing EN 78
- Envelope Feeder Details 79
- Inserting the Envelope Feeder 80
- Figure 4-14 82
- Figure 4-15 83
- EN PostScript Printing 5-3 87
- Switching Printer Languages 89
- (Personalities) 89
- To select a menu item: 90
- PostScript Fonts List 92
- PostScript Printing 5-9 93
- Control Panel.” 94
- 5-10 PostScript Printing EN 94
- EN PostScript Printing 5-11 95
- PostScript Configuration Page 96
- PostScript Printing 5-13 97
- 5-14 PostScript Printing EN 98
- Choosing Print Resolution 100
- Fine-Tuning Print Quality 101
- Enhancing Resolution 102
- Figure 6-2 103
- Adjusting Print 103
- EconoMode Printing 104
- Solving Printer Problems 105
- Clearing Paper Jams 106
- Solving Printer Problems 7-3 107
- 1 Remove Tray 2 108
- Solving Printer 109
- Problems 109
- Rear Cover 110
- Optional Tray 3 Paper Jam 111
- Repeated Paper Jams 113
- Resetting the Printer 114
- Testing the Printer 115
- Solving Printer Problems 7-13 117
- Checking Installed PCLFonts 118
- Solving Printer Problems 7-15 119
- Improving Print Quality 120
- Vertical Lines 121
- Toner Smear 121
- Background Gray Toner Shading 121
- Vertical Repetitive Defects 122
- Improperly Formed Characters 122
- Status Messages 123
- Warning Messages 125
- Error Messages 126
- Solving Printer Problems 7-23 127
- Service Messages 128
- Solving Printer Problems 7-25 129
- Troubleshooting Checklist 130
- Solving Printer Problems 7-27 131
- Getting Started Guide f 132
- Solving Printer Problems 7-29 133
- Print speed is slow 134
- Solving Printer Problems 7-31 135
- Manual feed problems 136
- 500-sheet Tray 3 problems 137
- Duplex option problems 137
- LaserJet 5/5M 138
- PostScript Troubleshooting 139
- Introduction 141
- Managing the Toner Cartridge 142
- Maintaining and 143
- Adjusting the 143
- Cleaning the Printer 145
- Printer Cleaning Tasks 146
- Continued on next page 147
- User-Replaceable Parts 149
- Tray 2 Pickup Roller 151
- Transfer Roller 152
- Fusing Assembly 153
- Optional Tray 3 Pickup Roller 154
- Media Specifications 155
- Paper and Preprinted Forms 156
- Media Specifications A-3 157
- Adhesive Labels 158
- Overhead Transparencies 159
- Envelopes 160
- Envelope Storage 161
- Envelope Margins 161
- A-8 Media Specifications EN 162
- Common PCL Printer Commands 163
- PCLPrinter Command Syntax 164
- Using PCL Printer Commands 165
- PCLFont Selection 165
- Setup Strings 166
- Location Requirements 169
- Printer Specifications 170
- Protecting the Environment 171
- • Toner Cartridges 173
- • Printer and Parts 173
- Regulatory Information 174
- VCCI Statement (Japan) 175
- Safety Information 175
- Laser Statement for Finland 176
- Printer Memory 179
- How Your Printer Uses Memory 180
- 9 Press [Go] to exit menus 183
- 10 Repeat Step 5 183
- SIMM Board Installation 184
- Installing SIMMs 185
- Continued on the next page 186
- Testing a SIMM Board 187
- Troubleshooting a SIMM Board 188
- Checking Procedure 189
- Validation Error Messages 189
- D-12 Printer Memory EN 190
- Serial Communication 191
- 25 to 9 pin adapter (C2809A) 192
- DB-9 Serial Cable pin outs 192
- DB-25 Serial Cable pin outs 193
- Pin Functions 194
- Warranty and Software License 195
- Exclusions 196
- Warranty Limitations 197
- Limit of Liability 197
- Repacking Guidelines 198
- HPSoftware Product License 199
- Sales and Service Offices 201
- Sales and Service Offices G-3 203
- EN Index-1 205
- Index-2 EN 206
- EN Index-3 207
- Index-4 EN 208
- EN Index-5 209
- Index-6 EN 210
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