Serial Interface Busy-Handling Protocols | Epson 8900 Series

Serial Interface Busy-Handling Protocols

The serial interface provides several methods for the printer to indicate its ready and busy conditions. The communication interface menu, described in Chapter 2 of this manual, allows you to select any of these methods during printer setup. The following paragraphs describe the serial interface busy-handling protocols.

Flow-Control Busy-Handling Protocols

These protocols are busy-handling protocols determined by the host that can be selected via the printer setup menu. The menu structure allows you to select either of the following flow-control busy-handling protocols or to set both protocols inactive.

qTransmit-On/Transmit-Off Protocol — When you select this busy-handling protocol, the printer sends a transmit-off(X-off) signal to indicate that its receive buffer is full or some other busy condition exists. When the printer is again ready to receive data, it sends a transmit-on(X-on) signal.

These signals (X-on and X-off) are equivalent to the device control characters DC1 and DCS, respectively, of the ASCII character set. Thus, the printer sends the DC3 control character to indicate that it is busy, and the DC1 control character to indicate that it is ready to receive data.

qEnd-of-Text/Acknowledge Protocol — When you select this busy-handling protocol, the host sends data in blocks of 256 characters or less. At the end of each block transfer operation, the host sends the end-of-text (ETX) control character to indicate that the operation is complete. The printer responds by sending the acknowledge (ACK) control character to indicate that it is ready to receive any subsequent data.

If the receive buffer is full (or some other busy condition exists), the printer delays sending the ACK control character until the busy condition is cleared.

Communication Interfaces 10-20

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Epson 8900 Series manual Serial Interface Busy-Handling Protocols, Flow-Control Busy-Handling Protocols

Contents

Model 8900 Series Printer Technical Reference Manual Contents Epson FX Printer Emulation Optional Emulation CommandsTl Model 855 Printer DP Emulation IBM Proprinter XL Emulation Serial Number Purchase Date Firmware Revision Copyright 2001 by Lake Erie Systems Contents Symbols Used in This Manual IBM Proprinter XL Emulation describes Epson FX Printer Emulation describes the commandsTexas Instruments Model 855 Printer WP Emulation Texas Instruments Model 855 Printer DP Emulation Supplies Other Manuals About the PrinterBuffalo Road Erie PA General Information Paper-Handling System Introduction Printer Features Print Quality Typical dot-matrix characters Low-resolution Medium-resolution High-resolutionEffect of increasing dot density Raster Graphics Printer Setup Graphics Printing Mode Display Operator control panel Setup/test menu Model 8900 Series Emulation Modes Line Feed and Carriage Return Upon Receipt of LF Execute CommandsEmulation mode submenu TI 880 Emulation Shift Out Equals Expanded Print Line Feed and Carriage Return Upon Receipt of CRCarriage Return Upon Receipt of LF, VT, or DC2 Graphics Automatic Line Feed Processing ModeTI 855 Emulation IBM Proprinter XL and Epson FX Emulations Automatic Carriage Return Hexadecimal Dump ModeSlashed Zeros Port Interface ParametersBuffer Size Flow Control Baud RateData Bits Parity Robust XON/XOFF XON/XOFF transmit-on/transmit-off PIN ConnectionETX/ACK end-of-text/acknowledge DTR Pin Character Set Miscellaneous Setup Parameters Axis Control Ribbon AdjustRibbon Type Power-Up Online Idle DelayPaper Pull-Down Warning Limiting Control Panel Operation Graphics Printing ModeLCD Language Paper Out Equals Busy Limiting control panel operation menu Test Features Character Sets and Global Commands Character Code Table Character Sets US Ascii Character Set US Ascii Character Set Variations Between US Ascii and International Ascii International Ascii Character Sets IBM PC1 Character Set, Left Half IBM PC1 Character Set IBM PC1 Character Set, Right Half IBM PC2 Character Set, Left Half IBM PC2 Character Set IBM PC2 Character Set, Right Half Nordic PC Character Set, Left Half Nordic PC Character Set Nordic PC Character Set, Right Half ISO 8859/1 Multinational Character Set, Left Half ISO 8859/1 Multinational Character Set ISO 8859/1 Multinational Character Set, Right Half IBM Multinational Character Set, Left Half IBM Multinational Character Set IBM Multinational Character Set, Right Half Control Characters Information separators C0 Control CharactersHexadecimal Char Code Definition Communication controls Format effectors Printer Commands Command Command Name Global Command DescriptionsGlobal Command Set Model 8900 Series Printers Global Commands Set Barcode Parameters Barcode Operations Print Barcode Text Oversize Characters FeatureSet Oversize Character Scale Factor Print Oversize Character Color Printing Selecting a Form Format Selecting an Automatic Sheet Feeder Bin Defining Raster Graphics Selecting a Font’s HMI Selecting a FontFont ID No Value of n Selecting Characters Per Inch cpiSelecting Print Quality Hex Value Pitch Mode Selecting an International Character SetCharacter Set Hex Selecting an Emulator Writing to the Printer Display Adjusting the Print head Z-Axis PositionPaper-Handling Operations Character Sets and Global Commands Texas Instruments Model 880 Printer Emulation Tab Right to Column N Cancel Double Line Spacing Introduction TI 880 Response Format Selection Tl 880 Answer Message Function Form Format Selection Model 880 Printer Emulation CommandsModel 880 Emulation Commands Command Command Name Printer Operation Horizontal Motion Command Command Name Margin Control Line Spacing Model 880 Emulation CommandsCommand Command Name Vertical Motion Character Pitch Font Selection Raster Graphics Variables N and n Model 880 Command Descriptions Sound Bell Printer Operation CommandsTransmit Configuration Report Code Configuration Code Description Model 880 Configuration Codes Miscellaneous Configuration Codes Code ErrorTransmit Status Report Select Unidirectional Printing Form Format Selection CommandsModel 880 Error Codes Cancel Unidirectional Printing Load Default Form Parameters TI Model 880 Printer Emulation Set Top and Bottom Margins at Lines N1 and N2 Margin Control CommandsSet Top Margin at Line N Set Bottom Margin at Line N Set Left and Right Margins at Columns N1 and N2 Restore Default Line WidthSet Left Margin at Column N Set Right Margin at Column N Move to Column n Horizontal Motion CommandsBackspace Tab Horizontally Clear All Horizontal Tab Stops Tab Right to Column NTab Right N Columns Set Horizontal Tab Stops Line Feed Vertical Motion CommandsSet Horizontal Tab Stop at Current Position Clear Horizontal Tab Stop at Current Position Tab Vertically N Lines Tab VerticallyMove to Line n Tab Vertically to Line N Clear All Vertical Tab Stops Character Pitch CommandsSet Vertical Tab Stops Set Vertical Tab Stop at Current Position Line Spacing Commands Set Line Spacing to n/216 Inch Set Line Spacing to 8 lpiSet Line Spacing to n/72 Inch Set Line Spacing to N/144 Inch Print Enhancement Commands Set Up Graphics Parameters Raster Graphics Commands Select 120 dpi Graphics Select 60 dpi Graphics Designate G0 Font by ROM Identifier N Font Selection CommandsSelect Font N Font Invocation Select Designated Character From G3 Font Designate G2 Font by ROM Identifier NDesignate G3 Font by ROM Identifier N Select Designated Character From G2 Font Invoke G2 Font as GR Invoke G1 Font as GRInvoke G3 Font as GR Texas Instruments Model 855 Printer WP Emulation Tab Vertically Absolute Page Introduction Motion Indexes Model 855 WP Commands Model 855 WP CommandsForm Format and Font Selection Model 855 WP Commands Command Name Horizontal Motion ESC SP Suspend Printing Model 855 WP Command DescriptionsSelect DP Mode Select WP Mode Set Most Significant Bit Cancel Reverse PrintingReset Most Significant Bit Select Reverse Printing Set Form Length to n1 n2 Lines Form Format and Font Selection Commands Select Right Margin Justification Set Left Margin at Current Position Cancel Right Margin JustificationSet Top Margin at Current Position Set Bottom Margin at Current Position Horizontal Motion Commands Tab Horizontally Absolute Move Back 1/120 inch Tab Vertically Absolute Move Down One-Half Line Character Pitch CommandsMove Up One Line Move Up One-Half Line Print Special Character Character Set CommandsSet Vertical Motion Index to n-1/48 Inch Set Vertical Motion Index to n-1/144 Inch Select Compressed Print Cancel Expanded PrintCancel Compressed Print Select Expanded Print Select Text-Underline Print Cancel Text-Underline PrintCancel Boldface Print Cancel Shadow Print Select 144 dpi Graphics Select 72 dpi Graphics Texas Instruments Model 855 Printer DP Emulation Set Character Pitch to 10 cpi Set Character Pitch to 12 cpi Introduction Command Name Printer Operation Model 855 DP Commands Model 855 DP Commands Command Name Vertical Motion Color Emulation Model 855 DP Command Descriptions Escape sequence ESC b Hexadecimal 1B Control character. BS Hexadecimal Tab Horizontally Move Print Position to Left Margin Escape sequence ESC Hexadecimal 1B 5E Character Pitch Commands Set Line Spacing to 7/72 Inch DC2 Select TI 857 Compatible Color Mode Select Epson-JX Compatible Color ModeColor Emulation Raster Graphics Commands IBM Proprinter XL Emulation Disable Automatic Line Feed Raster Graphics Commands Introduction IBM Proprinter XL Commands IBM Proprinter XL Emulation CommandsForm Format and Margin Control Character Set Character Pitch and Line Spacing IBM Proprinter XL Commands concluded IBM Proprinter XL Command DescriptionsCommand Name Print Enhancement Select Printer Cancel LineDeselect Printer Set Form Length to n Inches Form Format and Margin Control CommandsSet Top of Form Position Select Automatic Perforation Skip Cancel Automatic Perforation Skip Control character. CR Hexadecimal 0D Restore Default Tab Stops Perform n/216 Inch Line Feed Enable Automatic Line FeedPerform Reverse Line Feed Clear Vertical Tab Stops Character Pitch and Line Spacing CommandsDisable Automatic Line Feed Reverse Line Feed Select Programmable Line Spacing Print Multiple Specified Characters Select PC1 Character SetSelect PC2 Character Set Print Single Specified Character DC4 Select Text-Overscore Print Cancel Text-Overscore Print Select Subscript Print Cancel Superscript PrintCancel Subscript Print Select Superscript Print Enable/Disable Double-High Double-Wide Print M2 data byte, bit 0 is least significant M1 data byte, bit 0 is least significant Select High-Speed 120 dpi Graphics Select 240 dpi Graphics Mode Epson FX Printer Emulation Mode Perform n/216 Inch Line Feed Select Graphics Mode m Introduction ESC EM Epson FX Emulation Commands Epson FX Printer Emulation CommandsForm Format Command Command Name Horizontal Motion Command Command Name Character Set Epson FX Emulation Command Descriptions Delete Character Set Most Significant Bit to Zero Initialize PrinterSet Most Significant Bit to One Select Unidirectional Printing for One Line Only Cancel Most Significant Bit Control Form Format Commands Select Letter-Quality Courier Font Select Letter-Quality Gothic Font Select Full Justification Select Left Margin JustificationSelect Text Centering Set Left Margin at Column n Horizontal Motion Commands Set Relative Print Position Set Absolute Print Position N1...n32 Form Feed Set VTC Tab Stops Select Vertical Tab ChannelClear All VTC Tab Stops Set Intercharacter Space Line Spacing Commands Select Extended Graphics Character Set Select Italic Character Set Disable Character Positions 128-159 as Printable Characters Enable Character Positions 128-159 as Printable CharactersSelect International Character Set Select Expanded Print for One Line Cancel Double-High Print Select Expanded Print Until Canceled by ESC W NULSelect Double-High Print Cancel Compressed Print Cancel Boldface Print Select Master Print Mode Cancel Italic PrintSelect Italic Print Graphics Commands Select 9-Pin 120 dpi Graphics Select 9-Pin 60 dpi GraphicsSelect 240 dpi Graphics Reassign Graphics Mode Select Graphics Mode m Optional DEC LA 120 Emulation DEC LA120 Commands DEC LA120 Emulation Commands Horizontal Pitch Sequences Horizontal Tab Sequences Vertical Pitch Sequences Vertical Tab SequencesCharacter Set Selection Sequences DEC LA120 Emulation New Line ModeDEC LA120 Commands Not Recognized Answerback Memory Function Answerback Memory Message Load Auto Wrap Communication Interfaces 10-18 Introduction Data-Transfer Operations Communication interfaces simplified block diagramsHost Local system Parallel Interface Printer Host Parallel Communication Interface Parallel Interface Signals Name Pin Return Source Parallel Interface Signal Descriptions Data Strobe Signal Data SignalsAcknowledge Signal Fault Signal Busy SignalInitialize Signal Parallel Interface Communication Protocol Parallel data timing sequence Timing Requirements Parallel Interface Timing Requirements Initialize Sequence Serial Communication Interface Error ConditionsCommunication Interfaces Pin Source Serial Interface ConnectorSerial Interface Signals Name Interface Connection Interface Signal Descriptions Data Terminal Ready Signal Clear to Send SignalData Set Ready Signal Data Carrier Detect Signal Serial Data Format Interface Data Transmission Rate Transfer direction Start Bit Lsb Transfer direction Start BitSerial data structures Stop Bit Parity Flow-Control Busy-Handling Protocols Serial Interface Busy-Handling Protocols Direct-Connect Busy-Handling Protocols Optional Communication Interfaces Current Loop Communication Interface RS-422 Communication Interface Introduction Axis Adjustment Escape Sequence Isolated labels Uneven edges Considerations for Z-Axis Adjustments Paper motion is reversed Text Label Using the Z-Axis Escape SequenceEscape Sequence Z-Axis Printhead Position Right margin of 1-inch is set at column ESC DLE E TI855 EXT ESC CR P changes to TI855 WP Emulation Commands Index Communication interface Nvram Printing Unidirectional printing 7-8 Width, line Adjust