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Epson LQ-1500 Control Codes, Computer-to-Printer-Communications, note, Ameri- can Standard Code For Information Interchange, LQ-1500

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Chapter 4

Control Codes

This chapter introduces you to the control codes you can use to send instructions from your computer to your printer. If you already know how to program your printer, you’ll want to know how control codes work with the LQ-1500.You’ll also be interested in Appendixes A and E which provide the control codes.

Please note that this chapter contains technical information and you don’t have to read it in order to operate your printer or to perform ordinary word processing operations. If you don’t know how to program a printer, you can use your applications software to find out how to control the LQ-1500.

Computer-to-Printer-Communications

Alphabetical characters (letters) are foreign to computers; computers only know numbers. However, computers still manage to do a good job of manipulating the letters that we use for word processing. The secret lies in the fact that a computer doesn’t manipulate letters at all-it just manipulates numbers that represent letters and turns these numbers into the letters that we see on the screen and the printout.

The computer communicates with the printer by means of numerical codes. There are 256 different codes that the computer can send to the printer, represented by the numbers from 0 to 255. Since there are many different kinds of computers and many different kinds of print- ers, a standard set of codes was developed that almost all computers use to comunicate with printers. This set of codes is called the Ameri- can Standard Code For Information Interchange, or ASCII for short.

There are ASCII codes for all the letters in the alphabet (both upper- and lowercase), the numbers from 0 to 9, most punctuation marks,

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Contents

Page Page FCC COMPLIANCE STATEMENT FOR AMERICAN USERS Copyright © 1984 by Epson America, Inc Torrance, California Contents Installing Paper and Paper Feeders Types of Paper and Paper Feeders Pin-feedpaper and tractor unit Platen release lever Print head adjustment lever The LQ-1500Character Set Widths of the Proportional Characters ASCII Code Conversion Chart Figures Tables Introduction LQ-1500Features About This Manual Setting Up Your LQ-1500 Finding a Suitable Location Fig-we 1-1.Unpacking the LQ-1500 during operation. Here are some additional suggestions to follow: (see Figure 1-2) Getting to Know Your Printer Installing the paper feed knob Page Removing the dust cover Removing the front cover Discovering what’s inside Installing the Ribbon Cartridge Figure 1-7.Ribbon cartridge 1-8) Now Figure 1-8.Ribbon installation Figure 1-9.Ribbon operation the Installing the Sheet Guide Assembling the three pieces Attaching the sheet guide Page Figure 1-11.Paper guide position Figure 1-12.Sheet guide installation Connecting the LQ-1500to Your Computer Locating the interface card Page Installing the interface card Attaching the cable to the printer Connecting the printer cable Setting the DIP Switches Figure 1-18.Interface connection to computer WARNING: The DIP switches we are discussing are in the LQ-1500 printer. Special knowledge is required to set these switches while the Switch1 Switch Table 1-2.Settings for switch Function Switches and Table 1-3.International character set switch settings Installing the Power Cord Operation and Maintenance Controls and Indicators The power switch The control panel Power switch Figure 2-1.Controls and indicators •ON LINE light --glows green when data reception is possible The paper-outdetector Maintenance Cleaning the LQ-1500 Other maintenance Installing Paper and Paper Feeders Types of Paper and Paper Feeders Single-sheetpaper and sheet guide Pin-feedpaper and tractor unit More Printer Parts Platen release lever Print head adjustment lever Loading Single-SheetPaper Preparing the printer for single-sheetfeed Loading single-sheetpaper 1.Place 3.Press Paper Figure 3-2.Sheet load Note: You may damage printer parts if you do this repeatedly with the power ON Loading Pin-feedPaper Installing the tractor unit Preparing the printer for pin-feedpaper Page Inserting pin-feedpaper Figure 3-6.Paper inserted Figure 3-7.Aligning pin frames so that 5.Lock the pin-feedersin place by pushing the gray pin-feederlock levers back 7.Close the paper bail 8.Set the print head adjustment lever according to the thickness of your paper Proper placement of pin-feedpaper Removing pin-feedpaper 1.Remove Removing the tractor unit The LQ-1500 Self-Test Letter quality (switch 2-7up) Control Codes Computer-to-Printer-Communications How Many Names Can One Code Have Carriage return 0DH CHR$(13) Its common name CTRL/J page “4” Therefore, the <ESC> “4” that turns on italic print actually is ASCII 27followed by ASCII 52. But <ESC> “4” is easier to understand and remember Here are some other common abbreviations: Name ASCII code (decimal) Escape LQ-1500Command Summary Vertical Spacing Commands Vertical Spacing Commands (continued) Set n/180-inchline spacing Set n/60-inchline spacing Form Feed Set page length by lines Set page length by inches Set bottom margin can Cancel bottom margin Vertical tab Set vertical tabs n1, n2 n1 Select a vertical tab channel nl Horizontal Spacing Commands Horizontal Spacing Commands (continued) Horizontal tab Set horizontal tabs Set intercharacter space 0to 127) Print Style Commands Print Style Commands (continued) Cancel elite width print Proportional print on/off One-lineexpanded width print Cancel one-lineexpanded width print Expanded width print on/off Select compressed width print Cancel compressed width print Select emphasized print Cancel emphasized print Select double-strikeprint Cancel double-strikeprint Select italic print Cancel italic print cancels Underline on/off Select superscripts or subscripts Character Set Commands Graphics Commands Graphics Commands (continued) High-speed, double-densitydot graphics Miscellaneous Commands Miscellaneous Commands (continued) Delete character Deselect printer Select printer data Clear eighth-bit Cancel eighth-bitcontrol BelI Backspace Initialize printer Disable paper-outdetector Remarks: (continued) Enable paper-outdetector Return print head to home position (one-lineunidirectional print ing) Unidirectional printing on/off Changing Printing Style Proportional Print Styles Pica Expanded MISwiy Italic Page Page Page The LQ-1500Character Set Page Page Draft Letter quality ProDortional Widths of the Proportional Characters Figure D-1.A character and its widths (normal) Page Page Left Body code space Page Page ASCII Code Conversion Chart Decimal Hexadecimal 261A 271B 281C 291D A l 17l Decimal D A Specifications of the Epson LQ-1500 Paper Printer INDEX switch 1-2 22, 27, 32, 35, 67 switch 24 62 15 30, 32, 37 26,27 LQ-1500Application Notes LQ-1500Programmer’s Manual 2 56 14 32, 37 32 57 15 60 Page EPSON AMERICA, INC LIMITED WARRANTY rights from Page Page Using the LQ-1500Commands with BASIC Control Codes by Function <LF Page Master Select Codes DIP Switch Settings Settings for switch ASCII Code Conversion Chart 12<DC2