121, Font Descriptor Byte, Design Considerations | Lexmark 248X

on. For Letter Quality fonts, the font descriptor byte also identifies the pitch of the font. If multiple lookup tables have the same combinations of pitch and quality, only the first one is accessible.

Font Descriptor Byte

Bit 7	1 = This is the default font.
Bit 6	1 = Another lookup table follows.
Bits 5,4	Reserved (should be zero).
Bits 3-0	Quality and pitch.
	0000	= Draft
	0001	= 10 cpi Letter Quality
	0010	= 12 cpi Letter Quality
	0011 = Proportional Letter Quality
	0100	= Fast Draft
	0101	= 10 cpi Enhanced Letter Quality
	0110 = 12 cpi Enhanced Letter Quality

0111 = Proportional Enhanced Letter Quality (other values are not valid).

The pointer, control bytes, and compression masks for the 256 characters make up an ASCII font (character 0 is first and character 255 is last). The first two bytes of each entry are the absolute address of the first byte of the character's image data and are stored high-byte first, then low-byte second.

For examples of the download sequence, see “Designing Monospaced Fast Draft Characters” on page 125, “Designing Monospaced Draft Characters” on page 130, “Designing Proportionally Spaced Characters” on page 135, or “Designing Enhanced Letter Quality Characters” on page 141.

Design Considerations

The 24-wire printers use a character matrix that is 24-dots high. The width of the character matrix can vary. Typical monospaced characters widths are:

Fast Draft	9 dots
Draft	10 dots

Section 7: Downloading Characters and Fonts	121

Image 121

Lexmark 248X, 249X manual 121, Font Descriptor Byte, Design Considerations

Contents

Forms Printer 248x/249x United States Government Restricted Rights Contents Page Epson Mode Printer Commands Barcodes Glossary Index Viii Introduction Width Height Depth Weight Physical CharacteristicsAvailable Options Options Part Number 2480 2481 2490 2491 Print Speeds Mode 2480/2481 2490/2491Printhead Description 248x Environmental Conditions Power Requirements Power Cord Alternating Current Line Voltage PowerNoise Emission Value Following are noise emission values for your printer 2480/2490 Narrow Carriage Models Paper SpecificationsLength 2481/2491 Wide Carriage Models Manual Feed cut sheets Tractor Feeder continuous forms Diagnostics Ribbon SpecificationsPower-On Diagnostics Printer Test Programming Examples Wend Introduction Use the following format SIC Command Format Initial Values Description Parm Description Selection Dec Hex Printer Dec HexBit Off Parm Description Selection Dec Hex Parm Description Selection Dec Hex Parm Description Selection Dec Hex Control Codes Code Symbol Description Value Name Dec Hex Escape Sequences Printer Command Parameters Command Structure Select Code Page name of command Example of IBM Emulation Mode Printer Command Function Command Dec Hex See Printer Command Quick Reference IBM Emulation ModeFor more Information Mode data Data 1B 5B 67 Ln Hn mode58 n1,n2 M3 m4 Select Code Selecting a Character SetSelect Character Set Usage Notes Continuously Print Characters from a Code Print From Code Print One Character Download a Character SetUsage Note Located in the code page tables beginning on Start low/start high Select Global Font Gothic Select Global FontPrestige Orator PresentorScript Global Font and Code Global Font and Size ParametersPitch Dec Hs, Ls Hex Hs, Ls Code Decimal Hex This command sets the pitch at 12 cpi Select Print ModeSelect 12 cpi 248x Dec Hex Print Mode249x Select Print Type Style Height Line Space Dec Hex Dec Hex Emphasized Bold Print Use this command for bold print To begin bold printDouble-Strike Print To end bold print Set Print Direction Superscript or Subscript Sets double-wide printing mode Cancels double-wide printing modeContinuous Double-wide Printing Score Select Continuous Overscore Continuous Underline Decimal Hex Set Print Quality Graphics Print Modes Bit Number Binary Value Print WiresNormal Density Bit Image Graphics Mode Dec Mode and Horizontal Density 249x OnlyHorizontal Density Wires Dual-Density Bit Image Graphics Half Speed Mode Dec Hex Horizontal Density Wires High-Density Bit Image Graphics Dual-Density Bit Image Graphics Normal Speed Horizontal Movement Set Default Tabulation StopsSet Horizontal Tabulation Stops Set Horizontal Margins This command sets the left and right marginsMove Current Print Position Automatic Line Feed LF Line ControlReverse Line Feed Move Paper Vertically Set Vertical Units Vertical TabulationSet Vertical Tabulation Stops Sets as many as 64 tabulation stops by line number Set Line Spacing to 1/8 Inch Line SpacingSet Line Spacing to 7/72 Inch Activate Line Spacing for Text This command turns porportional space mode on and off Porportional Space ModeSet Line Spacing for Text Set Line Spacing for Graphics Set Top of Form Set Top of Form and Page LengthSet Page Length in Inches Set Page Length in Lines This command cancels Set Skip Perforation ESC N Cancel Skip PerforationSet Skip Perforation This command sets the barcode parameters to the printer Setup Barcode ParameterPrinter Control Deselect Printer Barcode Type Unit Module Width Dots Dec Hex Wire Setup Barcode Data Dec Name Dec Hex Description Font Selection Character Set Select an International Quality Font 248x Select Near-Letter249x Select Letter-Quality Font Select Character Style Parameter range Assign Character TablesFunction Table/Code Text Print Mode Begin or End Double-high Printing Select JustificationDelete Text Off Dec Hex Print Style Change Graphics Mode Command Pin Graphics Mode 248x onlyNormal Density Bit Image Graphics Dual Density Bit Image Graphics Dots per Inch Density Dpi Equivalent Command Set Graphics Mode Horizontal Tab BackspaceSet Horizontal Tab Stops Set Absolute Print Position Vertical Movement Format Other Commands Setup Barcode Data Setup Barcode ParameterSelect Condensed Mode Define Download Characers Epson Emulation Mode Printer Commands Select Standard Character Set Character SetSelect Block Graphics Character Set Code Page Set Print from CodeDecimal Hexadecimal Character Size and Spacing Character Style Value Variable/FeatureFactor 112 Custom Characters Dots per inch/Density Stored graphics data in one dot column bufferSpeed/Word Size Execute Horizontal Tab Backspace Carriage ReturnSet Horizontal Tabs by Characters Pitch 2480 2481 Pitch Shift Increment Set Horizontal Tabs by Dot ColumnsIndent from Left Margin Move to the Left Set Multiple Print PositionsMove to the Right Begin Uni-directional Printing Set Page Length in Inches Cancel Skip Over PerforationSet Page Length in Lines Select Skip Over Perforation Cancel Paper-out Sensor Cancels Half-speed PrintingSelect Print Suppress Mode Cancel Print Suppress Mode Eject Parallel Interface Voltage Levels Parallel Interface Computer to Printer Communication Computer Pin Connections1329605 10 ft 1427498 20 ft Printer Pin Line Description Parallel Pin Assignments Init Timing Universal Serial Bus Interface How to Connect the RS-232C Serial InterfaceSerial Interface Serial Interface Option Serial Cable Pin Assignments RS-232C Pin Signal DescriptionFollowing illustration shows the RS-232C serial cable Serial Interface Cable RS-232C Serial Communication Parameters RS-232C Using an IBM AT Personal Computer RS-232CVoltage Level Range Serial Data Frame Considerations RS-232C 100Data Transmission Start and Stop Bits 101 ErrorsData Flow Control XON/XOFF Protocol Timing 102 103 Serial Computer Configuration Recommendations RS-232COS/2 1.2 OS/2 2.0 104 248x Printers How Dots Are Added in NLQ ModeDesigning Draft and NLQ Characters 105 Vertical Lines 106 Intersections of Vertical and Horizontal Lines 107 Diagonal Intersecting Horizontal Line 108 Downloading Characters Designing Fast Draft Characters Designing NLQ II Characters109 Initializing the Download Area 110Downloading a Draft/NLQ Character Set Part One Calculating Count 1, Count Part Two Specifying the Download Data 111Bit Bit Values Functions Printable 112 113 Designing and Downloading the Draft/NLQ Copyright Symbol 114 Downloading an NLQ II Character Set 115 116 Bit Functions 117Printable Data 118 119 Designing and Downloading Characters 249x Printers120 Downloading a New Font Font Descriptor Byte 121Design Considerations Download Sequence 122 123 124 Managing the Download AreaLookup Table 125 Designing Monospaced Fast Draft Characters MSB LSB 126 127 Use the following command to initialize the download areaCreating the Character Data Downloading the Character Data 128Downloading the Font Descriptor Byte For more information about the Font Descriptor Byte, see Creating the Lookup Table Data 129Downloading the Lookup Table Data Send the following lookup table information to the printer 130 Designing Monospaced Draft CharactersPrinting the Character LSB MSB 131 Initializing the Download Data 132 133 134 135 Designing Proportionally Spaced Characters LSB MSB 136 Compressing the Character 137 138 Send the following lookup table example to the printer 139 140 141 Designing Enhanced Letter Quality Characters 142 1FFFF0 143 144 145 146 Barcode Function Barcodes Barcode Setup Command Is a space module Is a bar module 149Barcode Type Value 248x 249x Value 248x space 249x space Module adjustment Is the space width adjustment factor Minimum Minimum v1 Printer Model Value Values 151 Data Transfer Command 153 Barcode Symbologies 12, x0C 13, x0DN2 value Data character set Character Hex 155 Valid EAN-13 command N2 value Invalid EAN-13 command 157 Valid EAN-8 command Barcodes To 255, x01 to xFF 159 X53 161 Valid Code 39 command Lowercase ’a’ is not a valid data character for Code Invalid Code 39 command Interleaved 2of5 163 Valid Interleaved 2of5 command 165 Invalid Interleaved 2of5 command11, x0B Valid UPC-A command 167 Character N1 value b0=1 169 Valid Postnet command ’-’ dash is an invalid character for Postnet Postnet To 255, x02 to xFF 171 Function Hex Data character sets Data character set a 173Hex Character Code Data character set B Data character set C 175 Valid Code 128 command 177 Invalid Code 128 command Valid Code 128 command using multiple character sets 179 X0005 181 Example 183 Space width adjustment = default 185 Barcodes Code Pages Code 189 Code Page 437G Code 191 Code 193 Code Page 853T Code 195 Code 197 Code 199 Code 201 Code 203 Printing a Code Code Command Output from the previous example is shown below 205 Set Font Global, ESC 248x Font Global IDs FGIDs Decimal, Hex and Byte Decimal 207 Gothic 249x Font Global IDs FGIDs Decimal, Hex and Byte Decimal 209 Pitch 211 Decimal Hex Code Print Quality Decimal Hex 213 Select Fast Draft Interaction of Set Font Global and Set Print Quality 215 Character Sets 1 Character Set 217 Code Pages Glossary Glossary Data flow control RS-232C Data frames serial Data packets Numerics See serial adapter Index Index Reader’s Comment Form Business Reply Mail