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Lexmark Forms Printer 2481 Technical Reference - Page 102

XON/XOFF Protocol Timing, The following diagram illustrates XON/XOFF Protocol Timing.

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The following diagram illustrates DTR Protocol Timing. Legend: 1 The RTS signal is driven directly by the RS-232C line driver and is active any time power is supplied to the printer. 2 The DTR signal becomes active (high) when initialization is complete, telling the computer that the printer is ready to receive data. 3 DTR drops (low) to tell the computer that the printer buffer is full or the printer is busy and data transmission should stop. If the computer continues to send data after the printer lowers the DTR signal, data could be lost. DTR is raised (high) when the printer is again ready to receive data. XON/XOFF Protocol Timing When you select this flow control protocol, the printer sends an XOFF command to the host to indicate that the printer cannot receive more data because it has one of the following conditions: • Buffer full • Attendance error (paper out, printer error) • Printer is not in ready state The following diagram illustrates XON/XOFF Protocol Timing. Legend: 1 Data received when DSR is low is invalid and discarded. 102 Section 6: Using the Printer Interface

Section	Page
Introduction	9
Available Options	10
Physical Characteristics	10
Print Speeds	11
Printhead Description	11
248x	11
249x	11
Printhead Movement	12
Environmental Conditions	12
Optimum Temperature Ranges	12
Vibration	12
Clearances	12
Power Requirements	12
Power Consumption	12
Alternating Current Line Voltage Power	13
Power Cord	13
Noise Emission Value	13
Paper Specifications	14
2480/2490 (Narrow Carriage Models)	14
2481/2491 (Wide Carriage Models)	15
Ribbon Specifications	17
Diagnostics	17
Power-On Diagnostics	17
Printer Test	17
Programming Examples	18
Set Initial Conditions (SIC) Command	21
SIC Command Format	21
IBM Emulation Mode Printer Commands	27
Control Codes	27
Escape Sequences	28
Printer Command Parameters	28
Command Structure	29
Example of IBM Emulation Mode Printer Command	30
Printer Command Quick Reference (IBM Emulation Mode)	31
Selecting a Character Set	33
Select Character Set 1	33
Select Character Set 2	33
Select Code Page	33
Print From Code Page	34
Continuously Print Characters from a Code Page	34
Print One Character	35
Download a Character Set	35
Select Global Font	36
Select 12 cpi	40
Select Print Mode	40
Select Print Type Style	42
Emphasized (Bold) Print	44
Double-Strike Print	44
Superscript or Subscript	45
Set Print Direction	45
Continuous Double-wide Printing	46
Score Select	46
Continuous Underline	47
Continuous Overscore	47
Set Print Quality	48
Graphics Print Modes	49
Normal Density Bit Image Graphics	49
Mode and Horizontal Density (249x Only)	50
Dual-Density Bit Image Graphics (Half Speed)	51
Dual-Density Bit Image Graphics (Normal Speed)	52
High-Density Bit Image Graphics	52
Horizontal Movement	53
Set Horizontal Tabulation Stops	53
Set Default Tabulation Stops	53
Set Horizontal Margins	54
Move Current Print Position	54
Line Control	55
Automatic Line Feed (LF)	55
Reverse Line Feed	55
Move Paper Vertically	55
Set Vertical Units	56
Vertical Tabulation	56
Set Vertical Tabulation Stops	56
Line Spacing	57
Set Line Spacing to 1/8 Inch	57
Set Line Spacing to 7/72 Inch	57
Activate Line Spacing for Text	57
Set Line Spacing for Text	58
Set Line Spacing for Graphics	58
Porportional Space Mode	58
Set Top of Form and Page Length	59
Set Top of Form	59
Set Page Length in Inches	59
Set Page Length in Lines	59
Set Skip Perforation	60
Cancel Skip Perforation	60
Printer Control	61
Deselect Printer	61
Setup Barcode Parameter	61
Setup Barcode Data	63
Epson Emulation Mode Printer Commands	65
Font Selection	65
Text Print Mode	69
Graphics Print Modes	71
Horizontal Movement	73
Vertical Movement	74
Line Spacing	74
Page Format	75
Printer Control	75
Other Commands	76
OKI Microline Emulation Mode Printer Commands	79
Character Set	79
Character Size and Spacing	81
Character Style	82
Custom Characters	83
Graphics Print Modes	83
Horizontal Movement	85
Vertical Movement	88
Other Commands	89
Using the Printer Interface	91
Parallel Interface	91
Parallel Interface Voltage Levels	91
Computer to Printer Communication	92
Timing	95
Universal Serial Bus Interface	96
Serial Interface	96
Serial Interface Option	96
How to Connect the RS-232C Serial Interface	96
Serial Cable Pin Assignments (RS-232C)	97
Serial Interface Cable (RS-232C)	98
Using an IBM AT Personal Computer (RS-232C)	99
Serial Communication Parameters (RS-232C)	99
Serial Computer Configuration Recommendations (RS-232C)	103
Downloading Characters and Fonts	105
248x Printers	105
Designing Draft and NLQ Characters	105
Designing Fast Draft Characters	109
Designing NLQ II Characters	109
Downloading Characters	109
Designing and Downloading the Draft/NLQ Copyright (©) Symbol	113
249x Printers	120
Designing and Downloading Characters	120
Managing the Download Area	124
Designing Monospaced Fast Draft Characters	125
Designing Monospaced Draft Characters	130
Designing Proportionally Spaced Characters	135
Designing Enhanced Letter Quality Characters	141
Barcodes	147
Barcode Function	147
Data Transfer Command	152
Barcode Symbologies	153
Notes For Barcode Printing	179
Code Pages	187
Code Page 437	188
Code Page 437G	189
Code Page 813	190
Code Page 850	191
Code Page 851	192
Code Page 853T	193
Code Page 857	194
Code Page 858	195
Code Page 860	196
Code Page 861	197
Code Page 863	198
Code Page 865	199
Code Page 869	200
Code Page 920	201
Code Page 1004	202
Code Page 1053	203
Printing a Code Page	204
Set Font Global, ESC [I	206
Character Sets 1 and 2	215
Character Set 1	216
Character Set 2	217
Glossary	219