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Epson A794-D100 Select or Cancel Automatic Status Back (ASB)

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Chapter 6: Programming Information A794 Owner’s Guide

March 199994

Select or Cancel Automatic Status Back (ASB)

Enables or disables automatic status back (ASB) and specifies the status items. This

command is a batch mode command; that is, it is processed after all prior data in the

receive buffer has been processed. There may be a time lag between the printer

receiving this command and changing the ASB response, depending on the receive

buffer status.

If any of the status items listed above are selected, ASB is enabled and the printer

automatically transmits 4 status bytes whenever the selected status changes. If no status

is selected, ASB is disabled. All four status bytes are transmitted without checking DSR.

If the error status is enabled, a change in the following conditions will trigger the ASB:

♦ Receipt Cover

♦ Knife Error

♦ Out-of-Range Printhead Temperature

♦ Out-of-Range Voltage

♦ Paper Exhaust

ASCII GS a n

Hexadecimal 1D 61 n

Decimal 29 97 n

Value of nStatus of ASB

Byte 1= printer information

Byte 2= error information

Byte 3= paper sensor information

Byte 4= Paper sensor information

The bits of n are defined in the table.

Bit Off/On Hex Decimal Status for ASB

0Off

On 00

01 0

1Cash drawer status disabled.

Cash drawer status enabled.

1Off

On 00

02 0

2RS-232C Busy status disabled.

RS-232C Busy status enabled.

2Off

On 00

04 0

4Error status disabled.

Error status enabled.

3Off

On 00

08 0

8Receipt paper roll status disabled.

Receipt paper roll status enabled.

4 - - - Undefined

5 - - - Undefined.

6 - - - Undefined

7 - - - Undefined

Contents

Main Page March 1999 i Legal Notices March 1999ii Contents Page Chapter 1: About the Printer Page Models Available Model Identification A794 Model ID Key A 7 9 4 - X X X X Communication Interfaces Installations On a Flat Surface Vertically (see note) Features Note: Clearance must be provided for the cords at the rear of the printer. Options Page Printer Controls Page Changing Paper Page Page Testing the Printer Page Troubleshooting the Printer Printer Tone and Green LED Printing Problems Printer Does Not Work Chapter 3: Media and Supplies Guide Ordering Thermal Paper Thermal Paper Specifications Manufacturers How to Order Ordering Miscellaneous Supplies Ordering Cash Drawers Ordering Power Supply and Power Cord Page Chapter 4: Print Specifications Characters Print Modes Size Standard Compressed Paper Specifications Print Zones Print Zones for 80 mm Paper Print Zones for 82.5 mm Paper Page Page Page Page Page Page Page Page Page Communication Overview Interface Sending Commands Using DOS to Send Commands Using BASIC to Send Commands RS-232C Interface Print Speed and Timing XON/XOFF Protocol DTR/DSR Protocol A794 Owners Guide Chapter 5: Communication Interface March 1999 37 RS-232C Technical Specifications For more information about See these sections or documents Communication Connectors Power Connector Cash Drawer Connector RS-232C Settings A794 Owners Guide Chapter 5: Communication Interface March 1999 39 Parallel Interface IEEE Bi-directional Parallel Connector Page Chapter 6: Programming Information List of Commands Page Page Comparisons Command Descriptions Command Conventions Printer Function Commands Clear Printer Perform Full Knife Cut Perform Partial Knife Cut Generate Tone Select Print Mode Select Peripheral Device (for Multi-Drop) Initialize Printer Select Paper Sensors to Output Paper End Signals Select Sensors to Stop Printing Enable or Disable Panel Button Read from Non-Volatile Memory Generate Pulse to Open Cash Drawer Write to Non-Volatile Memory (NVRAM) Select Cut Mode and Cut Paper Vertical Positioning and Print Commands Print and Feed One Line Activate Carriage Return Feed n Print Lines Feed n Dot Rows Add n Extra Dot Rows Print Set Column Set Line Spacing to 1/6 Inch Set Line Spacing Print and Feed Paper Page Horizontal Positioning Commands Horizontal Tab Set Right-Side Character Spacing Set Absolute Starting Position Set Horizontal Tab Positions Set Relative Print Position Select Justification Set Left Margin Set Horizontal and Vertical Minimum Motion Units Set Printing Area Width Print Characteristics Commands Select Double-Wide Characters Select Single-Wide Characters Select 90 Degree Counter-Clockwise Rotated Print Select Pitch (Column Width) Select Character Set Define User-Defined Character Set Select or Cancel Underline Mode Copy Character Set from ROM to RAM Cancel User-Defined Character Select or Cancel Emphasized Mode Select or Cancel Double Strike Select or Cancel Italic Print Select Character Code Table Select International Character Set Select or Cancel 90 Degree Clockwise Rotated Print Select or Cancel Upside-Down Print Mode Select Or Cancel White/Black Reverse Print Mode Select or Cancel Smoothing Mode Select Superscript or Subscript Modes Summary of Rotated Printing Graphics Commands Print Raster Graphics Download BMP Logo Set Absolute Starting Position Select Bit Image Mode Select Bit Image Mode (continued) Select Single-Density Graphics Select Double-Density Graphics Select the Current Logo Define Downloaded Bit Image Column Print Downloaded Bit Image Convert 6 Dots/mm Bitmap to 8 Dots/mm Bitmap Printer Status Commands Request Alternate Status (parallel printers only) Transmit Peripheral Device Status (RS-232C printers only) Transmit Paper Sensor Status Transmit Printer ID Transmit Printer ID, Remote Diagnostics Extension Page Page Select or Cancel Automatic Status Back (ASB) Page Select or Cancel Automatic Status Back (ASB) (continued) Transmit Status Transmit Status (continued) Send Printer Software Version Print Test Form Real Time Commands Rules for Using Real Time Commands Moving Data through the Buffer Busy Line and Fault Conditions Recognizing Data from the Printer Real Time Request to Printer Real Time Status Transmission Page Real Time Status Transmission (continued) Real Time Printer Status Transmission Bar Code Commands Select Printing Position of HRI Characters Select Pitch of HRI Characters Select Bar Code Height Print Bar Code Page Print Bar Code (continued) Select Bar Code Width Page Mode Commands Print and Return to Standard Mode Cancel Print Data in Page Mode Print Data in Page Mode Select Page Mode Select Standard Mode Select Print Direction in Page Mode A D B Set Print Area in Page Mode Select Character Size Select Character Size (continued) Set Absolute Vertical Print Position in Page Mode Set Relative Vertical Print Position in Page Mode Macro Commands Select or Cancel Macro Definition Execute Macro Flash Download Commands Switch to Flash Download Mode Return Boot Sector Firmware Part Number Return Segment Number Status of Flash Memory Select Flash Memory Sector to Download Get Firmware CRC Return Boot Sector CRC Erase All Flash Contents Except Boot Sector Return Main Program Flash CRC Erase Selected Flash Sector Download to Active Flash Sector Select Memory Type (SRAM/Flash) Where to Save Logos or User-Defined Fonts Erase User Flash Sector Reset Firmware A794 Owners Guide Index March 1999 129 Index 8 A B C I L M O P