MICROLINE 790/791 Printer Handbook
Every effort has been made to ensure that the information in this document is complete, accurate and up-to-date. OKI assumes no responsibility for the results of errors beyond its control. OKI also cannot guarantee that changes in software and equipment made by other manufacturers, and referred to in this handbook, will not affect the applicability of the information in this manual. Mention of software products manufactured by other companies does not necessarily constitute endorsement by OKI.
Important Safety Instructions Your OKI printer has been carefully designed to give you years of safe, reliable performance. As with all electrical equipment, however, there are a few basic precautions you should take to avoid hurting yourself or damaging the unit: • Read the setup and operation instructions in this manual carefully. Be sure to save it for future reference. • Read and follow all warning and instruction labels on the printer itself. • Unplug the printer before you clean it.
• If you’re using an extension cord or power strip with the printer, make sure that the total of the amperes required by all the equipment on the extension is less than the extension’s rating. Generally, the total ratings of all equipment plugged into any one power line should not exceed 15 amperes. Don’t exceed this unless you know that the power line your equipment is plugged into has a rating above 15 amperes.
Contents Introduction ............................................................................................................. 1 Chapter 1: Installation ........................................................................................... 3 Unpacking ................................................................................................................... 3 Removing Shipping Retainers ........................................................................ 4 Installing Ribbon Cartridge .
Performing Basic Tasks ............................................................................................ 39 Selecting Print Quality .................................................................................. 39 Selecting Character Pitch .............................................................................. 40 Testing Your printer ....................................................................................... 42 Resetting Top of Form .........................................
Appendix E: ASCII Character Codes .............................................................. 119 ASCII Character Sets .............................................................................................. 119 Code Page ................................................................................................................ 123 Appendix F: Interfacing .................................................................................... 125 Pin Assignments for Parallel Interface Signals ...
Introduction This Guide is arranged to help you get your new MICROLINE 790 or 791 printer set up and running quickly as well as providing you with more detailed information for future reference. Here’s how it’s organised: • Chapter 1 (Installation) shows you how to get your printer ready to run and how to connect it to your computer. • Chapter 2 (Loading Paper) explains how to load paper for any of the two methods of paper feed.
2 Introduction
Chapter 1: Installation This chapter explains how to unpack and install your new printer. Unpacking Unpack your printer and make sure you have the following items. If you are missing any of these items, contact your dealer immediately for a replacement. • Printer • Ribbon cartridge • AC cord It is not included in case of some models. • Printer Handbook & Software on CD-ROM. Interface cable and paper are sold separately.
Removing Shipping Retainers Tab 1. Open access cover by grasping tabs at either end and lifting. 2. Remove printhead shipping retainer (leave cover open for installation of ribbon).
Knob Paper separator 3. Hold the knob and remove the paper separator. 4. Remove the protective material. " "mark Paper separator Protictive material 5. Set and attach the post to the“∆”mark of the upper cover and the paper separator. " "mark Protictive material 6. Remove the protective material from the pull-up roller assembly. Pull-up roller assembly Installing Ribbon Cartridge 1. With access cover open, grasp printhead and slide it until it is centered on platen. 2.
3. Holding ribbon cartridge with knob facing up and ribbon sheild facing platen, fit grooves on either side at back end of cartridge over pins on ribbon plate. Knob Ribbon shield Setting Headgap lever position Number of sheets 1 1 1 2 2 2 3 3 3 4 4 4 5 5 envelopes or extra-thick paper M Printhead 1 2 4. Lower front of cartridge over printhead until it snaps into place, then turn knob in direction of arrow (clockwise) to take up ribbon slack. 5.
Pin assignments for the parallel, USB and the serial interfaces are listed in appendix E. You must supply the cable for connecting your printer to your computer. a. In the case of parallel interface cable 1. Make sure both printer and computer are OFF. 2. Locate interface port on back of printer. Interface port 3. Plug parallel interface cable into port and secure it in place with wire loops. Wire loops b. In the case of USB interface cable 1. Make sure both printer and computer are OFF. 2.
Connection with Power 1. Make sure both printer and computer are OFF. 2. Plug power cord into back of printer. Plug other end into grounded outlet. Power cord Socket 3. Turn printer on. Printhead will cross back and forth along platen, and POWER light will come on. ALARM light will also come on, but don’t be concerned: it’s just telling you that there is no paper loaded. Power light Alarm light You’re now ready to load paper—proceed to Chaper2.
Chapter 2: Loading Paper Your printer has provision for single-sheet paper feed from the top and for continuous-form paper feed from the rear. You can also install options: the Cut Sheet Feeder, which holds a stack of 100 sheets for feeding from the top and the Push and/or Pull Tractors for feeding continuous-form labels, heavy card stock or multi-part forms from the bottom. See Chapter 5 for more information on these options.
Bottom feed (continuous forms only, thickness to 0.017” [0.44mm]) • Single-part continuous forms – 12 to 24 lb – Minimum 3” wide (*2) • Carbonless, multi-part forms – Original, plus 4 copies – 9 to 11 lb – Minimum 3” wide (*2) • Interleaf, multi-part forms (with carbon paper) – Original, plus 4 copies – 10 to 12 lb paper, with 9 lb carbon – Minimum 3” wide (*2) • Continuous-feed envelopes – 24 lb maximum – 6.5” to 9.
Loading Single-Sheet Paper The single-sheet paper path is best for letterhead stationery, memos, and envelopes. We also recommend it for printing graphs and charts because it provides the most accurate control of the paper. To load in single sheets of paper: If you have any continuous-form paper in the paper path, you must press the PARK button on the front panel to remove it from the path before lading single sheets. 1.
Paper separator Wire feed guide Paper feed guides 3. Grasp back of paper separator and unsnap it from housing, then swing it up into single-sheet feed position, making sure that wire feed guide is nestled in separator. 4. Adjust paper feed guides for width of paper and drop sheet of paper into separator. Paper will automatically feed into printer.
5. Baseline for Top of Form (TOF) on paper is indicated by red line on clear plastic paper shield. M Baseline 1 2 3 Hold Press to feed paper down in micro increments 6.
Loading Rear-Feed Paper The rear-feed paper path is recommended for single-thickness, continuous fan-fold paper when printing spreadsheets, long reports, etc. For graphics or charts, it’s best to use the single-sheet paper path. To load continuous-form paper from the rear: 1. If you have paper in paper path, be sure to remove it before installing rear-feed paper. To remove single sheet, press FF/ LOAD button. To remove bottom-feed paper, press PARK button. 2. Move paper lever to position marked “REAR”.
4. Hold up the middle part of the paper separator and pull upwards. Paper separator Pull-up roller assembly 5. Rotate the paper separator forward and stand against pull-up rolller assembly. 6. Locate tractors.
Lock lever Tractor cover 7. Pull up on lock levers to release tractors. Position right-hand tractor for width of paper you’re loading. The movement of the left tractor is limited to ensure that the paper will always contact the paper sensor when loaded. 8. Open the tractor cover, and raise the paper separator. Paper separator Tractor cover 9. Pull paper, and place first two holes on each side over tractor pins.
Paper separator 10.Replace the paper separator and insert until the paper separator and upper cover marks align.
11.Close tractor covers and adjust left tractor to position edge of paper: reference marks on printer indicate left edge position for the two most common paper sizes. When paper is properly aligned, lock left tractor in place by pushing back on lock lever. Tractor covers Lock lever Reference marks Wire feed guide 18 12.
14.Push FF/LOAD button. Paper will automatically feed into printer and ALARM light will go out. 15.Baseline for top of Form(TOF) on paper is indicated by red line on clear plastic paper shield. M 1 Baseline 2 3 Press to hold the paper before releasing the TEAR button. Press to bring the paper down to the print position. 16.If desired, change TOF setting using control panel: If form tear off is being selected in the printer menu, press the TEAR button to bring the paper down to the print position.
Hold Press to feed paper down in micro increments ☛ to move TOF further up on page, hold SHIFT button while pressing LF button: this will advance paper down in micro increments Press to feed paper up in micro increments 17.Press SEL button (SEL light will come on). To temporarily change the Top of Form setting for a particular print job, deselect the printer and press the LF button until you reach the TOF position you want to use. The printer will retain this setting until you turn it off.
Paper Handling Your printer has several handy paper handling features: • Tear • Form Tear-off • Paper Park Tear Feature When you’re using continuous forms with either the built-in rear-feed tractor or the optional bottom-feed push tractor, you can use this feature to advance the forms up to the tear position so you can easily tear off a printed sheet without wasting paper or readjusting the printer. To do this, simply press the TEAR button on the front panel.
Forms Tear-off Feature Caution! Do not engage Forms Tear-off when printing on labels! The Forms Tear-off feature can be engaged to automatically move the paper up to the tear position after the selected interval (500 milliseconds, one second, or two seconds). The page will stay in the tear-off position until the printer receives data. It will then move down to the initial printing position. This feature is normally turned off.
Switching Paper Paths To switch from continuous-form feed from the rear or bottom (optional push or pull tractor installed) of the printer to single-sheet feed from the top: 1. Tear off printed pages. 2. Press PARK button. 3. Swing wire guide up into paper separator, then pivot separator to upright position. 4. Move paper lever to position marked “TOP”. 5. Load single sheet paper into paper separator.
24 Loading Paper
Chapter 3: Operation This chapter explains how to operate your printer. It also provides instructions on how to change the default settings and how to perform basic tasks, including selecting typeface/print quality, selecting character pitch, testing your printer, and resetting Top of Form to the factory default. Control Panel Your printer’s front panel lets you control paper feeding, customize your printer’s defaults to your particular needs, and select print quality and character pitch.
The seven buttons to the left on your control panel are multi-function buttons. In routine printer operation, they are used to manipulate the paper, but you can also use them to enter and make changes in the printer’s program menu. The PRINT QUALITY and CHARACTER PITCH sections at the right on the front panel are used to select the quality and size of the printing. See “Performing Basic Tasks” later in this chapter for information on how to use these buttons.
Print Mode In its normal operating state, your printer’s front panel is in the Print Mode. Indicator Lights In the Print Mode, your printer has the following lights to indicate its status: 2 1 4 3 1. POWER light: Glows whenever printer is on. 2. SEL light: Glows when printer is selected, ready to receive data. Flashes when the printer is in print suppress mode or power saving mode. Goes out when printer is deselected (can’t receive data). 3.
Buttons When the printer is selected (SEL light on), only the functions marked at the top of the bank of buttons (LF, FF/LOAD, TEAR, PARK, QUIET) are in effect. When the printer is deselected (SEL light off), the functions marked at the bottom of the buttons (Micro Feed Down, Micro Feed Up, TOF) can be accessed by means of the SHIFT button.
Summary of Front Panel Button Functions Button SEL Print Mode Help on Power Up With CSF Installed Selects/deselects printer. Activates Menu Same as Print Mode Resets Paper Out of Paper Mode. Jam Alarm. Also ends Font Test or Rolling ASCII test . Menu Mode Resets Paper Out Alarm. SEL + SHIFT Activates Menu Mode. SHIFT With printer deselected: N/A used with other keys to set and store Top of Form. Same as Print Mode N/A LF Advances paper Up one Activates Font line. Press and hold to ad- Test.
Button Print Mode Help on Power Up With CSF Installed Menu Mode TEAR+ SHIFT Move the print head to Re- N/A verse. Move the print head to Reverse. Goes back to previous Value in Menu. PARK Parks continuous-form pa- N/A per. Ejects paper. Prints list of all Menu settings for current emulation. PARK+ SHIFT Move the print head to N/A Forward. Move the print head to Forward. Prints current Group Menu Setting. QUIET Activates/deactivates QUIET mode. Activates Rolling ASCII Test.
Button Print Mode Help on Power Up With CSF Installed Menu Mode SEL+LF N/A Resets Menu to factory default. N/A N/A QUIET+ PARK N/A Resets Top of Form to factory default. N/A N/A Activates hex dump mode. N/A N/A SEL+ N/A FF/LOAD N/A : Not applicable.
Menu Mode When your printer is in the Menu Mode, you can use the front panel controls to change the defaults for the printer parameters, including emulation, page length, line spacing, typeface, pitch, etc. For example, you might want to change the page length to 14 inches if you’re printing on legal-size documents, or to 3 inches if you’re printing on labels or small cards. To place your printer in the Menu Mode, hold the SHIFT button while pressing the SEL button (printer either selected or deselected).
Sample Menu The menu is made up of groups of parameters. Within each group is a list of items and each of those items has several possible settings. Here’s a sample Menu printout.
Summary of Menu Settings The table below details the entries in the printer Menu as it comes from the factory. The defaults are in bold face italic type. Other entries will appear in the Menu depending on what options you have installed and what emulation is engaged. For a complete listing of all the available Menu selections, along with explanations for each setting, see appendix B.
Group Item Setting Bottom Feed Line Spacing Form Tear-Off Skip Over Perforation Page Width * Page Length 6 LPI, 8 LPI Off, 500 ms, 1 sec, 2 sec No, Yes 13.6", 8" 11", 11 2/3", 12", 14", 17", 5", 3", 3.5", 4", 5.5", 6", 7", 8", 8.5" Top Feed Line Spacing Bottom Margin Page Width * Page Length 6 LPI, 8 LPI Valid, Invalid 8", 13.6" 11", 11 2/3", 12", 14", 17", 3", 3.5", 4", 5.5", 6", 7", 8", 8.
Group Item Setting Set-Up Operator Panel Function Reset Inhibit Print Suppress Effective Auto LF Auto CR *1 SI Select Pitch (10 CPI) *1 SI Select Pitch (12 CPI) *1 Time Out Print Auto Select Graphics Speed Centering Position CSF Type * Power Saving Power Save Time Full Operation, Limited Operation No, Yes Yes, No No, Yes No, Yes 17.
Menu Mode Indicator Lights In the Menu Mode, the following lights indicate your printer’s status: 1 2 1. POWER light: Glows when printer is on. 2. MENU light: Glows when printer is in Menu Mode.
Here is a summary of the buttons active in the Menu Mode: 1. GROUP button: Press to scan through groups of listings. Each time you press the GROUP button, a line will print, showing the next group in the Menu. To go back one group, hold the SHIFT button while pressing the GROUP button. 2. ITEM button: Press to scan through items for a particular group. Each time you press the ITEM button a line will print, showing the next item within the group.
Performing Basic Tasks Selecting Print Quality Print quality button Your printer allows you to select from three print qualities: HSD, utility and letter quality (LQ), HSD and Utility printing are in the Gothic typeface. The LQ printing is of noticeably higher quality and offers you a choice of seven typefaces: Courier, Gothic, Prestige, Orator, Swiss Bold, Roman and Swiss.
Selecting Character Pitch Character Pitch button The character pitch determines the width of the individual characters and is measured in characters per inch (cpi). To select the character pitch, press the CHARACTER PITCH button successively until the light underneath the pitch you wish to engage is lit (10 cpi, 12cpi, 15cpi, 17cpi, 20cpi, or Proportional). To reset the pitch to the user default (Menu Setting): 1. Be sure printer is deselected (SEL light out). If not, press SEL button. 2.
The table below summarizes the fonts available from your printer: Typeface Spacing Style LQ Courier 10 cpi 12 cpi Proportional 8 point Normal, superscript, subscript Normal, superscript, subscript Normal, superscript, subscript Normal LQ Letter Gothic 10 cpi 12 cpi Proportional Normal Normal Normal LQ Prestige 10 cpi 12 cpi Proportional Normal Normal Normal LQ Orator 10 cpi 12 cpi Proportional Normal Normal Normal LQ Roman 10 cpi 12 cpi Proportional 8 point Normal, superscript, subscript No
Testing Your printer Your printer has three your can run: the Font Test, the Rolling ASCII Test, and the Hexadecimal Dump Test. Font Test The Font Test provides a printout containing samples of available typefaces.
To run the Font Test: 1. Be sure paper is loaded. 2. Turn off printer. 3. Hold LF button for several seconds while turning printer on. (IF printer simply turns on without starting to print, you didn’t hold down LF button long enough.) Rolling ASCII Test The Rolling ASCII Test produces a continuous printout of all ASCII characters. The printing will continue until you stop it manually by pressing the SEL button.
To activate the Rolling ASCII Test: 1. Be sure paper is loaded. Caution! For wide carriage Model 791, be sure you have wide paper loaded! 2. Turn off printer. 3. Hold QUIET button for several seconds while turning printer on. (If printer simply turns on without starting to print, you didn’t hold down QUIET button long enough.) Hexadecimal Dump Test If you want to test the data your computer is sending to the printer, you can place the printer in the Hexadecimal Dump Mode.
To engage the Hexadecimal Dump Mode: 1. Be sure paper is loaded. 2. Turn off printer. 3. Hold SEL and FF/LOAD buttons for several seconds while turning on printer. The printer will print the line “Hex Data Dump” and be ready to receive data in the Hexadecimal Dump Mode. To run the test, simply send data to the printer while it is in the Hexadecimal Dump Mode. When you’re done, you can exit the Hexadecimal Dump Mode by either pressing the SEL button or by turning the printer off, then on again.
You will find a list of the bar code printer commands for each emulation in appendix C. Here is a brief explanation of each of the available bar codes, along with a sample printout for each one. UPC A Bar Code UPC (Universal Product Code) bar coding is used in the supermarket industry. UPC A coding contains ten digits: the first five digits represent the manufacturer, the second five digits identify the product. UPC E UPC E bar coding is a six-digit variation of UPC A, used for labeling small items.
EAN 8 EAN (European Article Numbering) bar coding is a variation of UPC coding. EAN 8 encodes eight digits. EAN 13 EAN 13 encodes 13 digits and contains the same number of bars as UPC A. The thirteenth digit combined with the twelfth digit provides a code representing a country. Code 39 Also known as 3 of 9 Code, code 39 is used in non-retail applications. Each character has five bars and four spaces. Code patterns have been developed for 44 different alphabetic, numeric and graphic characters.
Code 128 Code 128 has 106 different characters, each of which can have any one of three different meanings depending on which code set (A, B, or C) is engaged. A special code at the beginning indicates which set is engaged: three shift codes are also available for use within the bar code to indicate a change in the code set engaged, as required. Interleaved2 of 5 Inerleaved2 of 5 bar coding is used mainly in the distribution industry. Two digits are encoded: one in the bars and one in the spaces.
Chapter 4: Working with Software This chapter covers the fundamentals of setting up commercial software packages for use with your printer. Be sure to read your software documentation carefully for more details. Basic Terminology Before we start, let’s examine a few terms with which you may not be familiar.
Emulations In order to eliminate hundreds of different sets of printer commands, most printers emulate, or imitate, one of several general printers; i.e., they accept all of that printer’s commands and behave as though they were the emulated printer. Your printer has three emulations: • IBM Proprinter • IBM AGM • Epson LQ (factory default) Printer Drivers Compatible Printer Drivers (DOS) Many of the software packages you use will contain drivers 100% compatible with your printer.
IBM Proprinter Emulation IBM X24e AGM/XL24e AGM Emulation Oki ML 590/1 IBM IBM Proprinter X24e/ XL24e IBM Proprinter X24/ XL24 IBM Proprinter IBM Graphics Printer Use this emulation only when you've selected an IBM Proprinter X24e/ XL24e driver and you need to use Epson LQ high density graphics.
52 Working with Software
Solving, Chapter 5: Problem Maintenance, & Service This chapter provides solutions to some common printer problems and explains the routine maintenance procedures that will help keep your printer in tip-top operating condition. It also tells you how to order parts, consumables and accessories, and provides information on obtaining service for your printer. You will find your printer’s warranty at the back of this Printer Handbook.
…I’m getting strange symbols, incorrect fonts, etc., when I try to print a document? The printer driver you have engaged does not agree with the emulation selected for your printer. To check the emulation selected, first make sure paper is loaded, then press the SEL and SHIFT buttons simultaneously to enter the MENU on your printer. Next, press the GROUP button: this will print the emulation selected.
…there are dots missing in my printouts? The head gap may not be set correctly. Try moving the head gap lever to a lower setting. If that doesn’t help, the printhead may be damaged; call for service. … the Alarm light is on and the Character Pitch 15 light is flashing? This indicates a paper loading error. To stop the flashing light, press the SEL button. Before trying to load paper in again, check to be sure that you have the paper lever in the correct position (BOT, TOP, REAR) for the path you’re using.
…my word processor files don’t print the way I have the MENU and front panel set? Before sending a file to the printer, many word processors send either an “initialization string” or an I-Prime signal to the printer. The initialization storing contains codes that reset the printer to a default set of features: otherwise the printer might accidentally print using features set for a previous job. These codes will override panel or MENU settings.
Maintenance This section explains how to change ribbons, clear paper jams and clean your printer. Replacing the Ribbon Cartridge When replacing the ribbon, be sure to use only ribbons specifically for use with MICROLINE 790 /791 Turbo printers. For best results,use genuine OKI ribbons. 1. Turn printer off. 2. Disengage and swing open access cover. Caution! Be careful not to touch the printhead: it may be hot! 3.
5. Remove new ribbon cartridge from its packaging — do NOT remove clear plastic ribbon shield! 6. Hold ribbon cartridge with knob facing up and exposed portion of ribbon facing platen. Place flat end on ribbon plate, fitting grooves over pins on plate. Plastic shield facing platen 7. Lower front end of cartridge over printhead until it snaps into place. Turn knob in direction of arrow (clock-wise) to take up any slack in ribbon.
Clearing Paper Jams Caution! Always turn the printer off before you turn the platen knob! Rear Feed Jams To clear a rear-feed paper jam: 1. Turn off printer 2. Turn platen knob to back paper out of printer. Remove any ripped pieces of paper. 3. Reload paper, turn printer back on and press FF/LOAD button. If your paper keeps jamming, the chances are excellent that you have bits of paper stuck in the paper path. To eliminate this problem: 1. Turn off printer. 2. Use platen knob to back paper out of printer.
Tractor covers Remove pull-up roller assembly 4. Open tractor covers and remove paper from printer. 5. Open access cover and lift off pull-up roller assembly. Note: Never attach or remove the pull-up roller assembly when the paper separator is in the standing state. 6. Fold some single-sheet, continuousfeed paper over three times to produce page four sheets thick. Quadruple-thick paper 7. Load this quadruple-thick sheet onto tractor pins and close tractor covers. 8.
Replace pull-up roller assembly 10.Replace pull-up roller assembly. Note: When installing a pull-up roller assembly, Shift the paper lever in agreement with the “Rear” mark before the installation. 11.Reload regular paper (open tractor covers, place paper on pins, close tractor covers). Replace paper separator 12.Swing access cover and paper separator back into place. 13.Turn printer on and press FF/LOAD button.
Single Sheet Feed Jams To remove jammed single sheets of paper (top feed): 1. Turn printer OFF. 2. Rotate platen knob to back paper out of carriage. Lift off pull-up roller assembly 3. If necessary, open access cover and lift off pull-up roller assembly to provide access to remove any ripped pieces from around carriage. Button Feed Jams If bottom-feed paper jams: 1. Turn off printer and use platen knob to back paper out carefully. Lift off pull-up roller assembly 62 2.
Cleaning the Housing You should clean the printer every six months (or after about 300 hours of operation). To do this: 1. Turn printer OFF and remove paper from path. Remove pull-up roller assembly 2. Open access cover and remove pull-up roller assembly. 3. Use clean, dry cloth to dust area around carriage shaft and platen. Be sure to remove any loose particles of paper.
Accessories You can add even more flexibility to your printer by means of the following optional accessories. Cut Sheet Feeder, Single-Bin and Dual-Bin Mounts on the platen to provide continuous single-sheet paper feed. The bin will hold up to 100 sheets of standard, 20-lb paper. With cable for connection to printer. Push Tractor, Bottom-Feed Converts printer for feeding continuousform paper from the bottom.
Pull Tractor, Top-Mount Used for bottom-feed of labels or heavy card stock, or in conjunction with the rearfeed tractor to provide more precise paper control when you’re using multi-part forms. Includes cover for installation in place of access cover. Roll Paper Stand Adapts ML 790 printer for use with rolltype paper (not supplied). Not usable on ML 791. Includes stand and support. With cable for connection to printer.
Replacement Parts Replacement Part Access Cover, ML 790 Access Cover, ML 791 AC Cord Poll-up Roller Assembly, ML 790 Poll-up Roller Assembly, ML 791 Platen Knob Printhead Ribbon, Black 66 Ploblem Solving, Maintenance, & Service
Appendix A: Specifications Print Method Impact dot matrix Printhead 24 pins, 0.20 mm diameter with thermal protection Print Speed Mode High Speed Draft (HSD) Utility Letter Quality (LQ) Characters per Second (CPS) 10 cpi 420 cps 10 cpi 315 cps 12 cpi 378 cps 15 cpi 472 cps 17.1 cpi 269 cps 20 cpi 315 cps 10 cpi 105 cps 12 cpi 126 cps 15 cpi 157 cps 17.1 cpi 180 cps 20 cpi 210 cps Characters per Line (CPL) Setting 10 cpi 12 cpi 15 cpi 17.
Graphics Resolution: Resident Font Letter Quality Utility Bar Code: 360 x 360 dots per inch Courier, Gothic, Prestige, Orator, Roman, Swiss, Swiss Bold Gothic Code 39, UPC A, UPC E, EAN 8, EAN 13, Interleaved 2 of 5, Code 128, Postnet Receive Buffer Size MAX 128K Reliability Mean Time Between Failures (MTBF) 20000 hours at 25% duty cycle and 35% Page density Mean Time to Repair (MTTR) 15 minutes Printhead life Ribbon Life (on average, 10 cpi utility) 68 200 million characters average in 10 cpi uti
Paper Specifications Width Minimum Maximum 3” ML 790: 10” ML 791: 16” 12 to 24 lb. Weight Thickness Rear feed Bottom feed 0.014”(0.36 mm) 0.017”(0.44 mm) Paper type Feed Width range Weight Cut sheets Top only 14 to 24 lb. ML790: 7.2" to 8.5" ML791: 7.2" to 14.3" Single-part continuous forms Rear, Bottom 12 to 24 lb. ML790: 3" to 10" ML791: 3" to 16" Carbonless, multipart continuous form (orig. + 4 copies) Rear, Bottom 9 to 11 lb.
Dimensions (W x D x H) ML 790: ML 791: 15.7 x 13.6 x 6 inch (398 x 345 x 153 mm) 21.7 x 13.6 x 6 inch (552 x 345 x 153 mm) Weight ML 790: ML 791: 16.7 lb (7.6Kg) 21.1 lb (9.6Kg) Environmental Requirements Operating Temperature: Storage Temperature: Operating Humidity: Storage Humidity: 41 to 95˚F (5 to 35˚C) 14 to 122˚F (-10 to +50˚C) 20 to 80% RH 5 to 95% RH Electrical requirements 230 volts ac (+15%, -14%) 50/60 Hz (±2%) Specifications subject to change without notice.
Appendix B: Menu Selections The menu selections for your printer are summarized below. Factory defaults are indicated in bold face italic. Explanations for each item follow the table. The table below summarizes all possible menu settings available with your printer. Which of these you will actually see when you are working in the Menu depends on the active emulation and on the options installed.
Group Item Bottom Feed Line Spacing Form Tear-Off Skip Over Perforation Page Width * Page Length 6 LPI, 8 LPI Off, 500 ms, 1 sec, 2 sec No, Yes 13.6", 8" 11", 11 2/3", 12", 14", 17", 5", 3", 3.5", 4", 5.5", 6", 7", 8", 8.5" Top Feed Line Spacing Form Tear-Off *5 Bottom Margin Page Width * Page Length 6 LPI, 8 LPI Off, 500ms, 1 sec, 2 sec Valid, Invalid 8", 13.6" 11", 11 2/3", 12", 14", 17", 3", 3.5", 4", 5.5", 6", 7", 8", 8.
Group Item Setting Set-Up Power Saving Power Save Time Enable, Disable 5 min, 10 min, 15 min, 30 min, 60 min Parallel I/F I-Prime Pin 18 Auto Feed XT *2 Bi-Direction Buffer Print, Buffer Clear, Invalid +5V, Open Invalid, Valid Enable, Disable Serial I/F *4 Parity Serial Data 7/8 Bits Protocol Diagnostic Test Busy Line Baud Rate None, Odd, Even 8 Bits, 7 Bits Ready/Busy, X/On/X-Off No, Yes SSD-, SSD+, DTR, RTS 19200 bps, 9600 bps, 4800 bps, 2400 bps, 1200 bps, 600bps, 300 bps Valid, Invalid Ready
Explanation of Menu Items These explanations are in alphabetical sequence to make it easier to look them up. Many of the items will appear only with optional equipment installed, as noted below. You will find the items Line Spacing, Form Tear-Off, Skip Over Perforation and Page Length appearing several times in the menu (once for each paper path). Auto CR. IBM mode only. No (factory default) or Yes.
Busy Line. Appears only if optional Serial Interface is installed. SSD- (factory default), SSD+, DTR, RTS. If Ready / Busy protocol (factory default) is selected, you can choose which line your system monitors for a busy signal: SSD -9V, select SSDSSD +9V, select SSD+ DTR -9V, select DTR RTS -9V, select RTS Busy Time. Appears only if optional Serial Interface is installed. 200 ms (factory default) or 1 sec. Sets the length of the busy signal when the Ready / Busy protocol (factory default) is engaged.
Emulation Mode. IBM PPR , IBM AGM, or Epson LQ (factory default). Selects the printer command set you want your printer to use: IBM X24e or XL24e Proprinter, IBM X24e or XL24e Alternate Graphics Mode (AGM), or Epson LQ 850/ 1050. Form Tear-Off. Off (factory default), 500 ms, 1 sec, or 2 sec. Form Tear-Off advances the paper to the perforation so that you can tear off a sheet of continuous-forms paper.
Important! This feature also prevents access to the Menu. To access the Menu, turn the printer off, then hold down the SEL key while turning on the printer. Page Length. 11” (factory default), 11 2/3”, 12”, 14”, 17”, 5”, 3”, 3.5”, 4”, 5.5”, 6”, 7”, 8”, 8.5”. Selects the length of the paper you’ll be using in your printer. This enables the printer to keep track of the initial printing position on each page (Top of Form). Page Length Control. Choose page length control system for SASF mode.
Print Mode. LQ Courier (factory default), LQ Roman, LQ Swiss, LQ Swiss Bold, LQ Orator, LQ Gothic, LQ Prestige, HSD or Utility. Choose one of the LQ fonts for letter quality printing; choose utility for high-speed printing. Print Registration. 0 (factory default), 0.05 mm Left, 0.15 mm Left, 0.20 mm Left, 0.25 mm Left, 0.25 mm Right, 0.20 mm Right, 0.15 mm Right, 0.10 mm Right, or 0.05 mm Right. Change the setting as required to obtain the best registration for bi-directional printing.
Size. Choose Single (factory default) or Double width and height printing. Skip Over Perforation. No (factory default) or Yes. Change to Yes if you want the printer to advance automatically to the next page when it comes within one inch of the bottom of the page. If your software has its own page formatting controls, keep this item set to No to avoid interface. Style. Choose Normal (factory default) or Italics. Time Out Print. Valid (factory default) or Invalid.
80 Appendix B: Menu Selections
Appendix C: Commands–Epson Emulation This appendix contains the commands for the Epson LQ emulation, grouped by function. Normally the commands in this table override Menu settings. Except as noted, these commands are cancelled and the printer returns to factory and Menu settings when the printer receives an Initialization, Software I-Prime, or Change Emulation command, or when it is turned off.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Absoulte Horizontal Position ASCII: ESC $ n1 n2 Dec: 27 36 n1 n2 Hex: 1B 24 n1 n2 Move to new horizontal position. Amount of movement from left margin is calculated as follows: [n1 + (n2 x 256)] x (basic unit in inches), where the basic unit is set by ESC (U, set unit command. The default of the basic unit is 1/60 inch. n1=0 to 255 n2=0 to 255 n1=n2=0: left margin Max. value: for 1/60 inch basic unit, n1=48 n2=3(13.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Left Margin Set ASCII: ESC l n Dec: 27 108 n Hex: 1B 6C n Sets left margin n character spaces from printhead home position; must be at least 5 spaces (5 cpi) to left of right margin. n=0 to 255 n=0: home position Right Margin Set ASCII: ESC Q n Dec: 27 81 n Hex: 1B 51 n Sets right margin n character spaces from printhead home position; must be greater than the left margin.
84 Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Set n/60-inch Line Spacing ASCII: ESC A n Dec: 27 65 n Hex: 1B 41 n Sets line spacing of n/60-inch. n=0 to 255 n=0: no line feed. Set n/180-inch Line Spacing ASCII: ESC 3 n Dec: 27 51 n Hex: 1B 33 n Sets a line spacing of n/180-inch. n=0 to 255 n=0: no line feed Set n/360-inch Line Spacing ASCII: ESC + n or ESC [ n Dec: 27 43 n or 27 93 n Hex: 1B 2B n or 1B 5B n Sets line spacing of n/360-inch.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes It is a print carriage return execution command, which does not involve returning to previous settings following the execution of this command. Set absolute vertical print position ASCII: ESC (V n1 n2 m1 m2 Dec: 27 40 86 n1 n2 m1 m2 Hex: 1B 28 56 n1 n2 m1 m2 Indicates the absolute position within the paper size, and executes carriage return.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Set Vertical Format Unit (VFU) ASCII: ESC b m n1 n2 ··· nk NUL Dec: 27 96 m n1 n2 ··· nk 0 Hex: 1B 62 m n1 n2 ··· nk 00 Programs up to 8 separate sets (channels) of vertical tab stops.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Set page format ASCII: ESC (c n1 n2 t1 t2 b1 b2 Dec: 27 40 99 n1 n2 t1 t2 b1 b2 Hex: 1B 28 63 n1 n2 t1 t2 b1 b2 Set the top and bottom margins for the currently selected paper mode. n1=4, n2=0: specifies the number of parameters (in bytes) to follow. Top margin=(t1 + [t2 x256]) x (basic unit in inches) Bottom margin=(b1 +[b2 x256]) x (basic unit in inches) The default of basic units 1/360 inch.
88 Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Define Custom Character(s) ASCII: ESC & 0 [data] Dec: 27 38 0 [data] Hex: 1B 26 00 [data] Defines and stores in RAM up to 256 utility quality character patterns. Custom character will be cleared by Initialize command, Software I-PRIME command, Emulation Switch command, I/F I-PRIME signal, or by turning the printer off. If Receive Buffer Size in MENU is Set to 23K, this command is Ignoved.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Select Epson Character Set ASCII: ESC t n Dec: 27 116 n Hex: 1B 74 n Table selection is made from among four character tables. n=0: Character Table 0 n=1: Character Table 1 n=2: Character Table 2 n=3: Character Table 3 The tables designated by default are as follows: Character Table 0: Italic Character Table 1: Table being selected by "CodePage" in the MENU Character Table 2: DLL character reallocation.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes n3, n4 set vertical length of bars: normal value is ([n3 x 10] + n4) (15/180-inch) n5 sets width of modules or black bars, depending on style engaged.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Print Features Utility / LQ Selection ASCII: ESC x n Dec: 27 120 n Hex: 1B 78 n=0: Utility printing n=1: NLQ printing Select Draft Font ASCII: ESC y n Dec: 27 121 n Hex: 1B 79 n Select Draft Font type.
92 Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Proportional Spacing ASCII: ESC p n Dec: 27 112 n Hex: 1B 70 n See also ESC ! n command. n=1: Start proportional spacing n=0: Stop proportional spacing Select 10 cpi Pitch (Pica) ASCII: ESC P Dec: 27 80 Hex: 1B 50 Normally, selects 10 cpi (Pica). In compressed mode, selects 17.1 cpi. Select 12 cpi Pitch (Elite) ASCII: ESC M Dec: 27 77 Hex: 1B 4D Normally, selects 12 cpi (Elite). In compressed mode, selects 20 cpi.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Score (Lines) Selection ASCII: ESC ( - j h l n1 n2 Dec: 27 40 45 j h l n1 n2 Hex: 1B 28 2D j h 0 l n1 n2 Selects underline, strike-through, or overscore.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Stop Enhanced Printing ASCII: ESC H Dec: 27 72 Hex: 1B 48 Clears double strike printing set by ESC G command. Double Width (Expanded) Printing ASCII: ESC W n Dec: 27 87 n Hex: 1B 57 n n= 1: Start double width printing n= 0: Stop double width printing Immediate Double Width ASCII: SO or ESC SO Dec: 14 or 27 14 Hex: 0E or 1B oE Prints double width only to end of line: can also be canceled by DC4, ESC W 0 and ESC ! commands.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes n1, n2= 0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as n1 + (n2 x 256) Graphics, 8 -pin Mode Single Density Graphics ASCII: ESC K n1 n2 [graphic data] Dec: 27 75 n1 n2 [graphic data] Hex: 1B 4B n1 n2 [graphic data] Dot density 60 dpi horizontal, 72 dpi vertical.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes n=2: Double speed, double density, quasi- 120 dpi (adjacent dots can not be printed) n=3: Quadruple density, quasi- 240 dpi (adjacent dots can not be printed) n=4: CRT I, 80 dpi n=6: CRRT II, 90 dpi n=38: CRT III, 90 dpi ASCII: ESC ! n DEc: 27 33 n Hex: 1B 21 n Calculate n as the sum of the values of the features to be activated. If a feature's value is not included in the sum, it will be deactivated.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Set Most Significant Bit (MSB) to 1 ASCII: ESC > Dec: 27 62 Hex: 1B 3E Set the MSB (8th bit) to 1. Set Most Significant Bit (MSB) to 0 ASCII: ESC = Dec: 27 61 Hex: 1B 3D Sets the MSB (8th bit) to 0. Reset Most Significant Bit (MSB) ASCII: ESK # Dec: 27 35 Hex: 1B 23 Cancels ESC > or ESC =. MSB accepted "as is" from computer.
98 Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Software I-Prime ASCII: ESC } NUL Dec: 27 125 0 Hex: 1B 7D 00 OKI unique command. Clears data in print buffer (receive buffer unaffected); resets printer to menu default if applicable, non-menu features returned to factory default. Executes paper eject in Cut Sheet Feeder mode. Set unit ASCII: ESC ( U n1 n2 m Dec: 27 40 85 n1 n2 m Hex: 1B 28 55 n1 n2 m Sets the basic unit of horizontal and vertical lengths.
Epson Function Commands (ASCII, Decimal, Hexadecimal) Notes Turn raster graphics mode ON/ OFF ASCII: ESC DLE G Pn0 Pn Dec: 27 16 71 Pn0 Pn Hex: 1B 10 47 Pn0 Pn Print raster graphics ASCII: ESC . Pc Pv Ph Pm n1 n2 [data] Input data is printed with bit pattern in horizontal direction.
100 Appendix C: Printer Commands
Appendix D: Commands–IBM Emulation This appendix contains the commands for the IBM X24e/ XL24e Proprinter and X24e AGM/ XL24e AGM emulations, grouped by function. Normally the commands in this table override Menu settings. Except as noted, these commands are cancelled and the printer returns to factory and Menu settings when the printer receives an Initialization, Software I-Prime, or Change Emulation command, or when it is turned off and then on again.
102 IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Move to the Left (Backwards) ASCII: ESC e n1 n2 Dec: 27 101 n1 n2 Hex: 1B 65 n1 n2 Move to the left, relative to present position, calculated as (n1 =[n2 x 256])/ 120 inches n1=0 to 255 n2=0 to 255 n1=n2=0: no movement Self Left & Right Margins ASCII: ESC X n m Dec: 27 88 n m Hex: 1B 58 n m Sets left (n) and right (m) margins in character columns at current pitch. Once set, margins remain fixed even if character pitch is changed.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Vertical Control Set 1/8-inch Line Spacing ASCII: ESC 0 Dec: 27 48 Hex: 1B 30 1/8 -inch Line Spacing=8 lines per inch. Set 7/72-inch Line Spacing ASCII: ESC 1 Dec: 27 49 Hex: 1B 31 This is the line spacing used for graphics. Activate Line Spacing ASCII: ESC 2 Dec: 27 50 Hex: 1B 32 n This command is required to activate the line spacing set by the ESC A n command (see below).
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Automatic Line Feed Control ASCII: ESC 5 Dec: 27 53 n Hex: 1B 35 n n=Odd: Line feed automatically added to each CR (carriage return) n=Even: auto line feed turned Off n/ -inch Line Feed 360 ASCII: ESC % 4 n Dec: 27 37 52 n Hex: 1B 25 34 n OKI unique command. Prints data in buffer and executes a single n/360-inch line feed without changing line spacing.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Set Form Length in Lines ASCII: ESC C n Dec: 27 67 n Hex: 1B 43 n Sets page length in lines, relative to currently selected line spacing, calculated by multiplying value of n by line spacing ratio. n=1 to 255 This command cancels Skip Over Perforation setting. Set Skip Over Perforation ASCII: ESC N n Dec: 27 78 n Hex: 1B 4E n Activates Skip Over Perforation feature and sets it for n lines at the current line spacing.
106 IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Character Sets Select Code Page ASCII: ESC [ T1h NUL NUL Hcp Lcp NUL Dec: 27 91 84 1 h 0 0 Hcp Lcp 0 Hex: 1B 5B 54 1 h 00 00 Hcp Lcp 00 Selects Code Page 1, h=0 to 255: specify amount of data to follow, calculated as 1 = (h x 256) Hcp, Lcp=0 to 255: specifies Code Page ID No., calculated as 1 + (Hcp x256)+Lcp ID No.=437: USA ID No.=850: Multilngual ID No.=860: Portugal ID No.=863: Canadian French ID No.=865: Norway ID No.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Select IBM Character Set I ASCII: ESC 7 Dec: 27 55 Hex: 1B 37 Selects IBM Character Set I Select IBM Character Set II ASCII: ESC 6 Dec: 27 54 Hex: 1B 36 Selects IBM Character Set II Bar Code Commands Select Bar Code Type and ASCII: ESC DLE A m n1 ··· n8 Size Dec: 27 16 65 m n1 ··· n8 Hex: 1B 10 41 m n1 ··· n8 OKI unique command m=number of parameters specified (m=0, 1 or 3: command ignored) n1, n2: selects bar code style n1, n2=0, 1: EAN8 n1
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Print Postnet Bar Code Data ASCII: ESC DLE C n [data] Dec: 27 16 67 n [data] Hex: 1B 10 43 n [data] OKI unique command. n: designates amount of data to follow n=1 to 20 Data consists of single-digit numbers. Select Barcode type ASCII: ESC [ f Ln Hn Pk Pm Ps Lv Hv Pc 16-digit: 1B 5B 66 Ln Hn Pk Pm Ps Lv Hv Pc 10-digit: 27 91 102 Ln Hn Pk Pm Ps Lv Hv Pc Specifies the barcode setting. Ln Hn specifies the byte number of parameter.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Pc: specifies the control information. Pc Description bit0 sets the check digit. 0: does not add check digit. 1: add check digit. bit1 sets the human-readable character. 0: performs print. 1: does not perform print. bit2 (reserved) bit3 (reserved) bit4 (reserved) bit5 (reserved) bit6 (reserved) bit7 (reserved) ASCII: ESC [ f Ln Hn DATA 16-digit: 1B 5B 70 Ln Hn DATA 10-digit: 27 91 112 Ln Hn DATA Prints the barcode.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Hfid, Lfid: sets font typeface, calculated as (Hfid.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Proportional Spacing ASCII: ESC P n Dec: 27 80 n Hex: 1B 50 n Engages/ cancels proportional spacing n=0 to 255: n is odd number: start proportional spacing n is even number: stop proportional spacing When printer is in utility mode, this command will switch it to LQ proportional until it is canceled. Set 10 Cpi Pitch ASCII: DC2 Dec: 18 Hex: 12 This is standard pica typewriter size.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes n=24: 15 cpi, UTL, ROM n=26: 15 cpi, LQ, ROM n=32: 20 cpi, UTL, ROM n=34: 20 cpi, LQ, ROM 112 Start Italic Printing ASCII: ESC % G Dec: 27 37 71 Hex: 1B 25 47 OKI unique command. Italic characters may overlap slightly. Stop Italic Printing ASCII: ESC % H Dec: 27 37 72 Hex: 1B 25 48 OKI unique command. Cancels italic printing engaged by ESC % G command. Underlining ASCII: ESC - n Dec: 27 45 n Hex: 1B 2D n Underlines all text except tabs.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Select Character Style ASCII: ESC q n Dec: 27 113 n Hex: 1B 71 n Selects character style. n=0: normal n=1: outline n=2: shadow n=3: outline with shadow Start Emphasized Printing ASCII: ESC E Dec: 27 69 Hex: 1B 45 Prints horizontally shifted double dots in utility mode at half speed. Stop Emphasized Printing ASCII: ESC F Dec: 27 70 Hex: 1B 46 Cancels emphasized printing.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Overscore ASCII: ESC _ n Dec: 27 95 n Hex: 1B 5F n Prints a continuous overscore over all text characters except for tab spaces. n=0 to 255 n=odd: start overscore n=even: stop overscore Single Density Graphics ASCII: ESC K l h [graphics data] Dec: 27 75 l h [graphics data] Hex: 1B 4B l h [graphics data] Dot density 60 dpi horizontal, 72 dpi vertical.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes ESC Y, and ESC Z commands. Ratio is determined by value of variable n: n=0 or 1: 5 horizontal/ 6 vertical n=2: 1 horizontal/ 1 vertical n=3: Command ignored Invalid (trapped) in IBM AGM emulation. Graphics, 8 & 24-Pin Mode Graphics Select/ Print ASCII: ESC * m l h [graphics data] Selects 8-pin and 24-pin graphic modes and prints graphic data. Valid only for Dec: 27 42 m l h [graphics data] IBM AGM.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes m=9: Double density, 24-pin, 120 dpi [same as ESC * 33] m=11: Triple density, 24-pin, 180 dpi [same as ESC * 39] m=12: Hex-density, 24-pin, quasi-360 dpi [same as ESC * 40] l, h=0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as l + (h x 256) Miscellaneous Commands 116 Select Emulation Mode ASCII: ESC { n Dec: 27 123 n Hex: 1B 7B n OKI unique command.
IBM Function Commands (ASCII, Decimal, Hexadecimal) Notes Print Suppress Mode On ASCII: ESC Q n Dec: 27 81 n Hex: 1B 16 n Prints out data in print buffer and puts printer in Print Suppress Mode until DC1 command is received, I-PRIME signal is received, or SEL button is pushed. Command will be ignored unless Print Suppress Effective item in MENU is set to "YES.
118 Appendix D: Printer Commands
Appendix E: ASCII Character Codes ASCII Character Sets ML790/791 Printer Handbook 119
120 Appendix E: ASCII Character Codes
ML790/791 Printer Handbook 121
122 Appendix E: ASCII Character Codes
Code Page ML790/791 Printer Handbook 123
124 Appendix E: ASCII Character Codes
Appendix F: Interfacing This appendix gives the pin assignments for the parallel interface and Universal Serial Bus (USB). It also explains how to install the optional Serial Interface Board and gives the pin assignments for the serial interface.
Universal Serial Bus (USB) Universal Serial Bus Specification Revision 1.1 compliance. 1. Connector • Printer Side: “B” Receptacle (Upstream Input to the USB Device) • Cable Side: Series “B” Plug 2. Cable • Cable Lenght: Max 5 m (A cable must be met USB Spec Rev 1.1 for normal operation) Note: Cable is not provided. 3. Table of USB I/F signals Contact Number Signal Name 1 Vbus (Not Used) 2 D– 3 D+ 4 GND Sell Shield 4.
Installing the Serial Interface Caution! Handle the interface board with care to avoid damaging its components. The components can also be damaged by static discharges. We recommend that you leave the board in its protective packaging until you’ve read these instructions and are ready to install it. Make sure the printer is unplugged before you install the board. Parallel port Component side of board ML790/791 Printer Handbook 1. Remove plastic covering over opening for serial board in back panel:.
Board 3. By inserting board to the far end, it is locked by the lock piece inside. Lock piece 4. Connect suitable interface cable (must be purchased separately) to printer connector and to serial port of your computer. Be sure to tighten screws on both ends of cable to keep it in place. Important! Make sure that you do not have a parallel cable connected to the printer when you’re using the serial interface.
Pin Assignments for Serial Interface Signals Pin Signal Symbol Direction 1 2 3 4 5 6 7 8-10 11 12-19 20 21-25 Protective Ground Transmitted Data Received Data Request to Send Not used Data Set Ready Signal Ground Not Used Supervisory Send Data Not Used Data Terminal Ready Not Used PG TD RD RTS From Printer To Printer From Printer ML790/791 Printer Handbook DSR SG To Printer SSD From Printer DTR From Printer 129
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