DTR/DSR Protocol, Communication Connectors | M-S Cash Drawer A794

A794 Owner’s Guide

Chapter 5: Communication Interface

DTR/DSR Protocol

The DTR signal is used to control data transmission to the printer. It is driven low when the printer is ready to receive data and driven high when it cannot accept any more data. Data is transmitted from the printer after it confirms that the DSR signal is low.

RS-232C Technical Specifications

This section describes the pin settings for the connectors and the RS-232C interface parameters. The RS-232C parameters are selected through the configuration menu feature. The RS-232C parameters must match those of the host computer.

For more information about	See these sections or documents
Configuration menu feature	A794 Owner’s Guide
RS-232C settings	“RS-232C Serial Interface Settings”
	in the A794 Service Guide

Communication Connectors

The following illustration shows the RS-232C communication connectors and pin assignments. The connectors are located at the rear of the printer, and are specified as male, DB9, 9-pin D-shell, and female DB25, 25-pin with RTS and CTS pins connected.

9-pin DB-9 Connector

25-pin DB-25 Connector

DSR 6

RTS 7

CTS 8

Not Used 9

Shell-Frame Ground

Function

Pin Numbers

Function

1 Not Used

Frame Ground & Shield

1

14

Not Used

2 RXD

Transmit Data

2

15

Not Used

3 TXD

Receive Data

3

16

Not Used

4 DTR

RTS

4

17

Not Used

5 Logic Ground

CTS

5

18

Not Used

DSR

6

19

Not Used

Logic Ground

7

20 DTR

Not Used

8

21 Not Used

Not Used

9

22 Not Used

Not Used 10

23 Not Used

Not Used 11

24 Not Used

Not Used 12

25 Not Used

Not Used 13

December 1999

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M-S Cash Drawer A794 manual DTR/DSR Protocol, RS-232C Technical Specifications, Communication Connectors

Contents

Owners Guide Legal Notices Disclaimer Power Supply Contents Communication Interface Programming Information Model Identification Communication Interfaces Features OptionsDescription of Printer Models Available Description of Printer Communication Interfaces Models AvailableModel Identification Features Options Connect the Cables Unpack the PrinterChoose a Location A794 Thermal Receipt Printer Setup Guide Unpack the Printer Remove the Starter Paper Roll Supports On a Flat Surface Setting up the printerChoose a Location On a Wall Connect the Cables Communication Cable Power Supply Cable Cash Drawer Cables Paper Feed Button Reset ButtonPrinter Controls LED Tone Loading Receipt Paper To Load the Paper Using the Printer Paper jams Troubleshooting the Printer Configuring the Printer To start the test Poorly printed test printout Troubleshooting the Printer Troubleshooting the Printer Printer Tone and Green LED Printer Does Not Function Printing ProblemsChanging this setting USE Caution when This page intentionally left blank Ordering Miscellaneous Supplies Thermal Paper Specifications Manufacturers How to OrderOrdering Thermal Paper Ordering Thermal Paper Thermal Paper SpecificationsHow to Order Manufacturers Ordering Cash Drawers Ordering Power Supply and Power CordOrdering Miscellaneous Supplies Ordering Communication Cables Wall-Mount Kit Print Modes Size Paper Specifications Print ZonesCharacters Print Zones for 80 mm Paper Print Zones for 82.5 mm Paper Size CharactersPrint Modes Standard Print Zones for 80 mm Paper Paper SpecificationsPrint Zones Print Specifications Print Zones for 82.5 mm Paper Print Density and Density of Receipt Print Lines To change the Print Density Duty Cycle Restrictions Printing Solid Blocks Character Sets Code Code Code Code Code Code Code Code Code RS-232C Interface Interface Sending CommandsCommunication Overview Parallel Interface Using Basic to Send Commands Sending CommandsUsing DOS to Send Commands Communication Overview RS-232C Interface Print Speed and Timing XON/XOFF Protocol Pin DB-9 Connector Pin DB-25 Connector RS-232C Technical SpecificationsCommunication Connectors DTR/DSR Protocol Power Connector Cash Drawer Connector RS-232C Settings XON/XOFF, DTR/DSR Ieee Bi-directional Parallel Connector Parallel Interface By Command Code By Function Command Conventions List of Commands and LocationsComparisons Command Descriptions Command Conventions Ascii List of Commands and Location By Command Code 1B 4C Select Page Mode 1B 2D n Select or Cancel Underline Mode1B 49 n Select or Cancel Italic Print 1B 54 n Select Print Direction in Page Mode 1D 21 n Select Character Size 1D 3A Select or Cancel Macro Definition1D 42 n Select or Cancel White/Black Reverse Print Mode 1D 22 55 n1 n2 Flash Memory User Sectors Allocation 05 n Select Superscript or Subscript Modes Print Bar Code04 n Convert 6 Dots/mm Bitmap to 8 Dots/mm Bitmap Print Test Form By Function Printer Function CommandsVertical Positioning and Print Commands Perform Partial Knife Cut 1B 74 n Select International Character Set Horizontal Positioning CommandsPrint Characteristic Commands 1F 05 n Select Superscript or Subscript Modes 1F 04 n Convert 6 Dots/mm Bitmap to 8 Dots/mm 100 Graphics CommandsStatus Commands Macro Commands Barcode CommandsMode Commands User Data Storage Commands Flash Download Commands Comparisons 24 n1 n2 Clear Printer Command DescriptionsPrinter Function Commands Perform Full Knife Cut Select Peripheral Device for Multi-Drop Perform Partial Knife CutGenerate Tone Ascii ESC BEL Hexadecimal Decimal Default Initialize Printer Range of n Select Paper Sensors to Output Paper End SignalsDefault of n Enable or Disable Panel Button Select Sensors to Stop Printing Value of p1 Select Cut Mode and Cut PaperGenerate Pulse to Open Cash Drawer Value of p2 Print Test Form AX t Activate Carriage Return Vertical Positioning and Print CommandsPrint and Feed One Line Feed n Print Lines Add n Extra Dot Rows Range of n DefaultFeed n Dot Rows Set Line Spacing PrintSet Line Spacing to 1/6 Inch Ascii ETB Set Horizontal and Vertical Minimum Motion Units Print and Feed PaperPrint and Feed n Lines GS P x y Set Column Horizontal Positioning CommandsHorizontal Tab Ascii HT Set Absolute Starting Position Compatibility Information A794 receipt vs. A793 receipt Value of k Default Set Horizontal Tab Positions Set Relative Print Position To move to the left Select Justification Set Left Margin GS L nL nH Set Printing Area Width Select Single-Wide Characters Print Characteristics CommandsSelect Double-Wide Characters Ascii DC2 Ascii ESC DC2 Select 90 Degree Counter-Clockwise Rotated PrintSelect Pitch Column Width Set Right-Side Character Spacing Select Print Mode Exception Select or Cancel User-Defined Character SetDefine User-Defined Character Set Values and Ranges Select or Cancel Underline Mode ESC 0 0 Cancel User-Defined CharacterCopy Character Set from ROM to RAM ESC ? n Select or Cancel Emphasized Mode Select or Cancel Double Strike Select or Cancel Italic Print Select Character Size Select or Cancel 90 Degree Clockwise Rotated PrintSelect or Cancel Upside Down Print Mode Normal 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 Select Bit Image Mode Dot Single-Density Mode Value of r Print Advanced Raster GraghicsSelect Single-Density Graphics Data bytes Select Double-Density Graphics Select the Current Logo Define Downloaded Bit Image Hexadecimal 1D 2F m Decimal Print Downloaded Bit ImageConvert 6 Dots/mm Bitmap to 8 Dots/mm Bitmap Value and Range of m Batch Mode Status CommandsStatus Command Introduction Hexadecimal 1B 75 Decimal 27 117 Value of returned byte Transmit Peripheral Device Status RS-232C printers onlyESC u Hexadecimal 1B 75 n Decimal Transmit Paper Sensor Status Hexadecimal Decimal Values Transmit Printer ID Transmit Printer ID, Remote Diagnostics Extension Values of n Programming Information A794 Owner’s Guide December 107 Undefined. Fixed to off Send Printer Software Version Alternate Implementation Real Time CommandsPreferred Implementation Rules for Using Real Time Commands Moving Data through the Buffer Related Information = Transmit Printer Status Busy Line and Fault ConditionsReal Time Status Transmission = Transmit Error Status = Transmit RS-232C Busy Status = Transmit Receipt Paper Status Real Time Request to Printer Value of Byte Real Time Printer Status TransmissionAscii GS ENQ Select or Cancel Automatic Status Back ASB Auto Status Back 118 December December 119 Recognizing Data from the Printer Select Pitch of HRI Characters Bar Code CommandsSelect Printing Position of HRI Characters Select Bar Code Height Print Bar Code GS k m n d1…dn 1D 6B m n d1…dn 29 107 m n d1…dn Select Bar Code Width CODE39 Cancel Print Data in Page Mode Mode CommandsPrint and Return to Standard Mode Ascii FF Ascii ESC FF Print Data in Page ModeSelect Page Mode Ascii ESC L Ascii ESC S Select Standard ModeSelect Print Direction in Page Mode Set Print Area in Page Mode N1-4 = N5 = N6 = N7 = N8 = Set Absolute Vertical Print Position in Page Mode Set Relative Vertical Print Position in Page Mode Hexadecimal 1D 3A Decimal Macro CommandsSelect or Cancel Macro Definition Execute Macro Value of t Read from User Data Storage User Data Storage CommandsWrite to User Data Storage Read from Non-Volatile Memory December 133 GS U n1 n Flash Memory User Sectors AllocationErase User Flash Sector Printer operation Flash Download CommandsSwitch to Flash Download Mode ESC Select Flash Memory Sector to Download Return Boot Sector Firmware Part NumberReturn Segment Number Status of Flash Memory Get Firmware CRC Return Main Program Flash CRC Erase All Flash Contents Except Boot SectorReturn Microprocessor CRC Erase Selected Flash Sector Ascii GS Space Reset FirmwareDownload to Active Flash Sector 1D FF Index Basic DOS December 141