microline - Harris Technology

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.
OKI and MICROLINE are registered trademarks of OKI Electric Industry Company,
Ltd..
IBM and PC are registered trademarks of International Business Machines Corporation.
Epson is a registered trademark of Seiko Epson Corp. Lotus and 1-2-3 are registered
trademarks of Lotus Development Corporation. Microsoft and MS-DOS are registered trademarks and Windows is a trademark of Microsoft Corporation.
WordPerfect is a registered trademark of WordPerfect Corporation.
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. Use only a damp cloth; do not use liquid
or aerosol cleaners.
• Place your printer on a firm, solid surface. If you put it on something unsteady,
it might fall and be damaged; if you place it on a soft surface, such as a rug, sofa,
or bed, the vents may be blocked, causing it to overheat.
• To protect your printer from overheating, make sure no openings on the printer
are blocked. Don’t put the printer on or near a heat source, such as a radiator or
heat register. If you put the printer in any kind of enclosure, make sure it is well
ventilated.
• Do not put anything into the ventilation slots on the sides of printer, you could
get a shock or cause a fire.
• The printhead can get quite hot when it has been printing for a length of time.
Do not touch the printhead untill it has had a chance to cool off.
• Do not use your printer near water, or spill liquid of any kind into it.
• Be certain that your power source matches the rating listed on the back of the
printer. If you’re not sure, check with your dealer or with your local power company.
• Your printer has a grounded plug as a safety feature, and it will only fit into a
grounded outlet. If you can’t plug it in, chances are you have a non-grounded
ontlet; contact an electrician to have it replaced with a grounded outlet. Do not
use an adapter to defeat the grounding.
• To avoid damaging the power cord, don’t put anything on it or place it where it
will be walked on. If the cord becomes damaged or frayed, replace it immediately.
• 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.
• Aside from the routine maintenance described in this handbook, don’t try to
service the printer yourself; opening the cover may expose you to shocks or
other hazards. Don’t make any adjustments other than those outlined in the
manual – you might cause damage requiring extensive repair work.
• If anything happens that indicates that your printer is not working properly or
has been damaged, unplug it immediately and follow the procedures in Chapter 5. These are some of the things to look for:
The power cord or plug is frayed or damaged.
Liquid has been spilled into the housing, or the printer has been exposed to
water.
The printer has been dropped or its cabinet has been damaged.
The printer doesn’t function normally when you’re following the operating
instructions.
• Screen jitter on your CRT may occur in an environment where the space between your printer and CRT is narrow (200 mm or less). In such cases, open up
the space.
Contents
Introduction ............................................................................................................. 1
Chapter 1: Installation ........................................................................................... 3
Unpacking ................................................................................................................... 3
Removing Shipping Retainers ........................................................................ 4
Installing Ribbon Cartridge ...................................................................................... 5
Making Connections .................................................................................................. 6
Connection with Computer ............................................................................ 6
Connection with Power ................................................................................... 8
Chapter 2: Loading Paper ...................................................................................... 9
Loading Single-Sheet Paper .................................................................................... 11
Loading Rear-Feed Paper ........................................................................................ 14
Paper Handling ......................................................................................................... 21
Tear Feature ..................................................................................................... 21
Forms Tear-off Feature .................................................................................. 22
Paper Park Feature ......................................................................................... 22
Switching Paper Paths ................................................................................... 23
Chapter 3: Operation ............................................................................................ 25
Control Panel ............................................................................................................. 25
Print Mode ................................................................................................................. 27
Indicator Lights .............................................................................................. 27
Buttons ............................................................................................................. 28
Menu Mode ............................................................................................................... 32
Sample Menu .................................................................................................. 33
Summary of Menu Settings .......................................................................... 34
Menu Mode Indicator Lights ....................................................................... 37
Menu Mode Buttons ...................................................................................... 37
Resetting Menu to Factory Defaults ............................................................38
Performing Basic Tasks ............................................................................................ 39
Selecting Print Quality .................................................................................. 39
Selecting Character Pitch .............................................................................. 40
Testing Your printer ....................................................................................... 42
Resetting Top of Form ................................................................................... 45
Using Bar codes .............................................................................................. 45
Chapter 4: Working with Software .................................................................... 49
Basic Terminology .................................................................................................... 49
Printer Commands ......................................................................................... 49
Emulations ...................................................................................................... 50
Printer Drivers .......................................................................................................... 50
Compatible Printer Drivers (DOS) .............................................................. 50
Windows Printer Drivers .............................................................................. 51
Chapter 5: Problem Solving, Maintenance, & Service................................... 53
Problem Solving ....................................................................................................... 53
Maintenance .............................................................................................................. 57
Replacing the Ribbon Cartridge................................................................... 57
Clearing Paper Jams ...................................................................................... 59
Cleaning the Housing .................................................................................... 63
Accessories ................................................................................................................ 64
Replacement Parts .......................................................................................... 66
Appendix A: Specifications ................................................................................ 67
Appendix B: Menu Selections ............................................................................ 71
Explanation of Menu Items ..................................................................................... 74
Appendix C: Commands–Epson Emulation .................................................... 81
Appendix D: Commands–IBM Emulation .................................................... 101
Appendix E: ASCII Character Codes .............................................................. 119
ASCII Character Sets .............................................................................................. 119
Code Page ................................................................................................................ 123
Appendix F: Interfacing .................................................................................... 125
Pin Assignments for Parallel Interface Signals .................................................. 125
Universal Serial Bus (USB) .................................................................................... 126
Installing the Serial Interface ................................................................................ 127
Pin Assignments for Serial Interface Signals ...................................................... 129
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.
• Chapter 3 (Operation) describes how to control your printer from the front panel.
It also explains how to change the defaults, how to test your printer and how to
use bar codes.
• Chapter 4 (Working with Software) gives you information on selecting a driver
and installing your printer on popular software packages.
• Chapter 5 (Problem Solving/Maintenance/Service) gives helpful hints on how
to solve common printer problems and how to maintain your printer in tip-top
shape.
• Appendices A through E contain a variety of reference material, including specifications, menu listings, lists of printer programming commands and ASCII
characters.
ML790/791 Printer Handbook
1
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.
ML790/791 Printer Handbook
3
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).
Shipping retainer
4
Installation
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. Remove ribbon cartridge from its packaging.
Center
printhead
on platen
ML790/791 Printer Handbook
Important! Leave the clear plastic ribbon shield on the cartridge!
5
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. The headgap lever by the side of cartridge
adjusts for different paper thicknesses.
Set it for the number of sheets in the
forms you’re using from 1 to 4; use setting 5 for envelopes or extra-thick paper. Adjust the setting up or down for
the best print quality.
Note: When the setting is set at 2~5, the
printer automatically slows down for better
print quality with thicker multipart forms.
Knob
3
Headgap lever
Important! Be sure to use only ribbons
specifically for use with MICROLINE 790
series.
For best results, use genuine OKI ribbons.
Making Connections
Connection with Computer
There instructions are for the standard parallel interface and USB interface. Instructions
for installation/connection of a serial interface are included with the serial interface accessory. For more information on the serial interface accessory, see Chapter 5.
6
Installation
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. Locate interface port on back of printer.
USB port
3. Plug USB interface cable into port.
ML790/791 Printer Handbook
7
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.
8
Installation
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.
Top Feed
• Single sheets (basis weight 14 to 24 lbs)
• Single envelopes
– 24-lb maximum
– 6.5” to 9.5” wide
• Transparencies (8.5 x 11”)
Rear feed (continuous forms only, thickness to 0.014” [0.36 mm])
• Single-part continuous forms
– 12 to 24 lb.
– Minimum 3” wide (*1)
• Carbonless, multi-part forms
– Original, plus 3 copies
– 9 to 11 lb
– Minimum 3” wide (*1)
• Interleaf, multi-part forms (with carbon paper)
– Original, plus 4 copies
– 10 to 12 lb paper, with 9 lb carbon
– Minimum 3” wide (*1)
(*1) Please change mentioned below centering Position within a set-up group following indication of 32 pages when a form of 3” wide is used by Rear Feed.
In the case of ML790 “Mode 1”.
In the case of ML791 “Mode 2”.
ML790/791 Printer Handbook
9
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 9.5” wide (envelope itself)
• Labels
– minimum 3” wide (*2)
– maximum 10”(ML790) or 16” (ML791) wide
• Card stock: papers up to 120 lb maximum
(*2) Please change mentioned below centering Position within a set-up group following indication of 32 pages when a form of 3” wide is used by Bottom Feed.
In the case of ML790 “Mode 1”.
In the case of ML791 “Mode 2”.
10
Loading Paper
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. Make sure printer is turned ON and
deselected (SEL light off – press SEL
button to deselect it necessary).
SEL light
The ALARM light will remain on
until paper is loaded.
Move
to"TOP"
ML790/791 Printer Handbook
2. Move paper lever to position marked
“TOP”.
11
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.
Flashes
If the sheet of paper doesn’t feed in
properly, the “15” light in the Character Pitch section at the bottom
right of the control panel will begin flashing. To correct this, press
the SHIFT and RESET buttons simultaneously, then reload the
sheet.
Press
12
Loading Paper
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. If desired, change TOF setting using
control panel:
☛ to set TOF further down on page,
hold SHIFT button while pressing FF/
LOAD button: this will advance paper
up in micro increments
Press to feed
paper up 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
7. Press SEL button (SEL light will come
on).
ML790/791 Printer Handbook
13
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”.
Position
"Rear"
Paper
separator
14
3. Open the access cover.
Loading Paper
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.
Tractors
ML790/791 Printer Handbook
15
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.
Please note that an equal number of paper holes must be engaged on either
tractor in order to ensure proper paper
feed.
Paper holes on pins
16
Loading Paper
Paper
separator
10.Replace the paper separator and insert
until the paper separator and upper
cover marks align.
Upper cover
" "mark
" "mark
ML790/791 Printer Handbook
17
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.Adjust right tractor so that paper holes
are centered on pins(careful – if paper
is stretched too tight or left too loose, it
can jam and cause problems), then lock
right tractor in place by pushing back
on lock lever.
13.Set Paper separator and swing wire feed
guide over to rest on pull-up roller assembly to prevent from curling back
into printer.
Loading Paper
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 down the SHIFT button
and release the TEAR button.
☛ to set TOF further down on page,
hold SHIFT button while pressing FF/
LOAD button: this will advance paper
up in micro increments
ML790/791 Printer Handbook
19
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.
20
Loading Paper
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.
Press
The tear feature can not be used when the optional pull tractor is installed.
ML790/791 Printer Handbook
21
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. To activate it, enter the printer menu (see Menu
Mode in Chapter3) and choose one of the intervals.
Some programs, such as high resolution graphics packages, pause occasionally while sending data to the printer. If the pause lasts more than the selected
interval, the paper will advance to the tear-off position until more data is
received. No data will be lost, but this extra paper movement can cause uneven print registration in graphics. If you have this problem, use the menu to
deactivate Forms Tear-off.
Paper Park Feature
If you have continuous-form paper loaded and you wish to switch to another paper
path, first tear off the printed pages, then simply press the PARK button. The continuous-form paper will immediately retract from the paper path.
Press
22
Loading Paper
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.
To switch from top feed to continuous-form tear or bottom (optional push or pull
tractor installed) feed:
1. Make sure no sheet is in paper path (press FF/LOAD to remove single sheet from
path).
2. Lower paper separator to continuous forms position and swing wire guide over
onto pull-up roller assembly.
3. Move paper lever to position marked “REAR” or “BOT”, as appropriate.
4. Press FF/LOAD button. Continuous-form paper will advance into print position.
ML790/791 Printer Handbook
23
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.
Here’s a breakdown of the controls on the front panel:
ML790/791 Printer Handbook
25
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.
Important! The print quality and character pitch set by means of the front panel can
be overridden by commands sent by the commercial software package from which
you’re printing a document. If you run into this problem, see Chapter 5 for information on how to correct it.
26
Operation
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. ALARM light: Glows when error condition exists, such as out of paper or paper
jam. Also glows when paper lever is set to wrong position.
Important! If the ALARM light is blinking, an unrecoverable error condition exists.
Try turning the printer off, then on again; if the light is still flashing, contact your
service dealer (see Chapter 5 for more information on obtaining service).
4. QUIET light: Glows when printer is in QUIET state (printer selected or deselected).
ML790/791 Printer Handbook
27
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.
Each button can have several functions, depending on the mode in use (Print Mode
or Menu Mode), on whether or not the printer is selected and on whether or not the
optional Cut Sheet Feeder (CSF) is installed. Most buttons also have a different function if they are pressed while the printer is being turned on. In addition, different
combinations of two buttons can be used to access functions.
The various function available for each button are summarized in the table below.
The PRINT QUALITY and CHARACTER PITCH buttons are discussed under
“Performing Basic Tasks,” later in this chapter.
28
Operation
Summary of Front Panel Button Functions
Button
SEL
Print Mode
Help on Power Up
With CSF Installed
Menu Mode
Selects/deselects printer. Activates Menu Same as Print
Resets Paper Out of Paper Mode.
Mode
Jam Alarm. Also ends Font
Test or Rolling ASCII test .
Resets Paper
Out Alarm.
SEL +
SHIFT
Activates Menu Mode.
Exits 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.
vance by repetitive line
feeds.
Same as Print
Mode
Advances to
next Group in
Menu.
LF+
SHIFT
With printer deselected, Activates Font
moves Top of Form setting Test.
up (paper moves down)
on page in micro increments.
Same as Print
Mode
Goes back to
previous
Group in
Menu.
FF/LOAD Feeds in sheet of paper or N/A
advances continuous-form
paper to print position.
Inserts or Ejects
Page.
Advances to
next Item in
Menu.
FF/LOAD With printer deselected, N/A
+SHIFT moves Top of Form setting
down (paper moves up)
on page in micro increments.
Same as Print
Mode
Goes back to
previous Item
in Menu.
N/A
Advances to
next Value in
Menu.
TEAR
Activates Menu Same as Print
Mode
Mode.
Moves continuous-feed N/A
paper up for tear-off or
back down for printing
(select/deselect states).
N/A : Not applicable.
ML790/791 Printer Handbook
29
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.
Activates/deactiN/A
vates QUIET mode.
Sets Top of Form.
Activates Rolling ASCII Test.
Sets Top of Form.
N/A
PRINT Selects next Print Quality N/A
QUALITY mode.
Selects next Print
Quality mode.
N/A
PRINT Sets/Resets
QUALITY Print mode.
+SHIFT
Sets/Resets Incre- Prints all Menu
mental Print
settings, regardmode.
less of emulation/options
engaged.
QUIET+
SHIFT
Incremental N/A
CHARAC- Selects next pitch setting.
TER
PITCH
N/A
Selects next pitch
setting.
N/A
CHARAC- With printer deselected, N/A
TER
resets printer.
PITCH+
SHIFT
With printer dese- N/A
lected, resets
printer.
FF/LOAD N/A
+TEAR
N/A
Resets Menu
and Top of
Form to factory
default.
N/A
N/A : Not applicable.
30
Operation
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.
ML790/791 Printer Handbook
31
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). The MENU light will come on and,
if the printer was selected, the SEL light will go out.
To exit the Menu Mode, hold the SHIFT button and press the SEL button. The MENU
light will go out and the SEL light will come on.
32
Operation
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.
The first column lists the groups; the second, items; the third, settings:
ML790/791 Printer Handbook
33
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
Printer Control
Emulation Mode
Epson LQ, IBM PPR, IBM AGM
Font
Print Mode
LQ Courier, LQ Roman, LQ Swiss, LQ
Swiss Bold, LQ Orator, LQ Gothic, LQ
Prestige, Utility, HSD
10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20 cpi
No, Yes
Normal, Italics
Single, Double
Pitch
Proportional Spacing
Style
Size
Symbol Sets
Character Set
Language Set
Zero Character
Code Page
Rear Feed
Line Spacing
Form Tear-Off
Skip Over Perforation
Page Width*
Page Length
Set I, Set II
American, French, German, Britishi, Danish I, Swedish, Italian, Spanish I, Japanese,
Norwegian, Danish II, Spanish II, Latin
American, French Canadian, Dutch, Publisher
Slashed, Unslashed
USA, Canada French, Multilingual, Portugal, Norway, BRASCII, Abicomp, Multilingual 858, ISO 8859-15
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"
* ML791 only
34
Operation
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", 8.5"
1 sec, 2 sec, 500ms
by Menu Setting, by Actual Page Length
Wait Time
Page Length Control
Set-Up
Graphics
Receive Buffer Size
Paper Out Override
Print Registration 1
Print Registration 2
ML790/791 Printer Handbook
Bi-directional, Uni-directional
64K, 128K, 1 Line, 32K
No, Yes
0, 0.05 mm Left, 0.10 mm Left, 0.15 mm Left,
0.20 mm Left, 0.25 mm Left, 0.25 mm Right,
0.25 mm Right, 0.15 mm Right, 0.10 mm Right,
0.05 mm Right
0, 0.05 mm Left, 0.10 mm Left, 0.15 mm Left,
0.20 mm Left, 0.25 mm Left, 0.25 mm Right,
0.25 mm Right, 0.15 mm Right, 0.10 mm Right,
0.05 mm Right
35
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
17.1 CPI, 15 CPI
20 CPI, 12 CPI
Valid, Invalid
No, Yes
Low, High
DEFAULT, MODE 1, MODE 2
Wide, Narrow
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
* ML791 only
*1 IBM mode Only
*2 EPSON mode Only
36
Operation
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.
Menu Mode Buttons
1
ML790/791 Printer Handbook
2
3
4
37
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. To
go back one item, hold the SHIFT button while pressing the ITEM button.
3. SET button: Press to change setting for the items. Each time you press the SET
button, a line will print across the page showing the next setting for that item.
Keep pressing the button until the setting you wish to engage appears. To go back
one setting, hold the SHIFT button while pressing the SET button.
4. PRINT button: Press to print out listing of current settings for each items, group
by group.
Resetting Menu to Factory Defaults
To reset your printer Menu to the factory settings, turn the printer off, then hold the
SEL and LF buttons while turning it back on again.
Hold while turning printer on
38
Operation
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. To select the print quality/ typeface
you want, keep pressing the PRINT QUALITY button until the lights are lit beside the
combination you want. The LQ Roman, LQ Swiss Bold and LQ Swiss typefaces are
selected when the lights on either side are both lit.
For example, to select the LQ Roman typeface, press the PRINT QUALITY button
until the following lights appear:
Your printer also prints any of eight different bar codes accessible through
printer commands. For more information on bar codes, see the end of this chapter.
ML790/791 Printer Handbook
39
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. Hold SHIFT button while pressing CHARACTER PITCH button.
If the SI command is received from your software, the character pitch selected
on the control panel will be overridden by the SI command.
40
Operation
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
Normal, superscript, subscript
Normal
Normal
LQ Swiss
10 cpi
12 cpi
Proportional
8 point
Normal, superscript, subscript
Normal, superscript, subscript
Normal
Normal
LQ Swiss Bold
10 cpi
12 cpi
Proportional
Normal
Normal
Normal
Utility Gothic
10 cpi
12 cpi
Normal, superscript, subscript
Normal, superscript, subscript
HSD Gothic
10 cpi
Normal
Barcode
Code 39
UPC A, UPC E, EAN 8,
EAN 13, Interleaved 2 of
5, Code 128, Postnet
N/A
Scalable fonts’
(LQ Courier, LQ
Roman< LQ Swiss)
11 point~ 64 point
Normal
ML790/791 Printer Handbook
41
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. Here’s a
portion of a Font Test printout:
42
Operation
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. Here’s a
sample portion of a Rolling ASCII Test:
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43
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. When the printer is in the Hex Dump Mode,
all data received, including text and printer commands, will be printed in both hexadecimal and ASCII format.
In the ASCII format, all non-printable characters will be represented by a period.
For example, this line of BASIC code:
LPRINT CHR$ (27);“0”;CHR$ (30);“This is an example of a hexadecimal
dump.”
would print like this:
44
Operation
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.
Resetting Top of Form
To reset the Top of Form to the factory default:
1. Turn off printer.
2. Hold down QUIET and PARK buttons while turning printer back on.
Using Bar codes
Your MICROLINE 790/791 printer incorporates eight different bar codes:
• UPC A
• UPC E
• EAN 8
• EAN 13
• Code 39
• Code 128
• Interleaved 2 of 5
• Postnet
ML790/791 Printer Handbook
45
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.
46
Operation
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.
ML790/791 Printer Handbook
47
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.
Postnet
Postnet bar coding is used by the U.S. Post Office for sorting mail by automated equipment. It incorporates a coding system using five bars and four spaces for each digit.
48
Operation
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.
Printer Commands
If you’re using commercial software with an appropriate printer driver (see
“Printer Drivers” below), the printer commands will normally be sent to the
printer by your software and you won’t even need to think about them.
Printer commands are signals sent by your PC to the printer which guide and control
its operation. Printer commands tell the printer what character pitch to use, what font
to use, what margins to use, whether to use single or double spacing, when to engage/disengage double width or double height printing, etc.
Printer commands can be sent in decimal, ASCII, or hexadecimal form. The values
(decimal/ASCII/hexadecimal) for each type of command depend on which emulation is active (see Appendix C for a listing of printer commands for each emulation).
With only a few exceptions, printer commands begin with the ESC character, decimal
27 (hexadecimal 1B), which serves as signal to the printer that what follows is to be
interpreted as a command rather than just a string of characters. Some printer commands expect you supply a numerical value, representing tab stops, line spacing, etc.
ML790/791 Printer Handbook
49
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. For older software, however, it may be necessary to select a driver that
functions nearly the same as a driver specifically designed for your printer. This generally means that you will be selecting a driver that provides commands to access
most, but not all of the available functions; however, the commands that are available
will perform properly with your printer.
The table below summarizes the various drivers that will work with your printer.
They are listed in order by decreasing compatibility as you go down the list: select
one from as high up on the list as possible, based on what is available from among the
drivers supplied with your software. If you don’t see one from near the top of the list,
give the software manufacturer a call to see if they have added any drivers to those
supplied when you purchased your software. Software manufacturers are constantly
updating their lists of drivers to keep up with the printer market and they may very
well have one which will give maximum compatibility with your printer.
50
Working with Software
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.
Epson LQ
Emulation
Oki ML 590/1 Epson
Epson LQ 870/ 1170
Epson LQ 850/ 1050
Epson LQ 860/ 2550
Epson LQ 2500
Epson LQ 1500
Epson LQ
Epson FX
Epson JX
Epson LX
Epson RX
Epson MX
Because there are some differences in characteristics such as speed or access to various features, you may wish to experiment with several different drivers. If you must
select a driver that is not listed in the table, be sure to check it thoroughly for print
features such as boldface, underline and changes in pitch. Don’t be surprised if boldfaced items are printed twice, underlines are misplaced, wide spaces are left between
lines or the printer behaves chaotically (turn off the printer if the latter occurs). These
are all characteristics of an incompatible driver selection.
Windows Printer Drivers
To use this printer on a Windows operating system, install the Windows printer driver,
that is on the Printer Software CD-ROM provided with your printer, on your computer.
For information about which Windows systems are compatible with the printer drivers on the Printer Software CD-ROM and the installation procedure open the Readme
file on the Printer Software CD-ROM.
ML790/791 Printer Handbook
51
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.
Problem Solving
What if …
…nothing happens when I turn on the printer?
The printer may not be plugged in. Check the power cord connection to the outlet
and to your printer. If you’re using a power strip, make sure it’s turned on. Check to
be sure that the fuse hasn’t blown or that the circuit breaker hasn’t tripped.
…the printer doesn’t print when the computer sends data?
The printer may be deselected. If the SEL light is out, press the SEL button to select the
printer.
The printer cable may not be securely connected. Check the cable to be sure that it is
properly connected to both the PC and the printer.
If you have installed the serial I/F board, check to be sure that the board is firmly
seated in the printer.
ML790/791 Printer Handbook
53
…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.
If the emulation is not the one you want to use, press the SET button to change it to
the one you want before exiting the MENU (to exit, press SEL and SHIFT buttons).
If the emulation is correct, check your software documentation on how to select a
printer driver, then check to be sure that you have selected one of the drivers listed for
that emulation on page 50). The closer the driver is to the top of the list, the more
compatible it will be with your printer. If your software doesn’t have any of the indicated drivers available, check with the software manufacturer to see if they have added
any additional drivers since you purchased your software.
If you have embedded any printer commands in your software, check to be sure that
you entered them correctly.
…I’ve installed a brand new ribbon and the printing is smeared and streaked?
The plastic shield on the ribbon is either loose or missing. The shield must be left on
the ribbon when you are installing the cartridge. To remedy this situation, move the
printhead to the center of the platen (careful – printhead may be HOT!) and lift off the
ribbon cartridge. Check the ribbon shield. If it’s loose, secure it in place properly. If it’s
missing, locate it and reinstall it.
…ink smears on the paper when I print narrow columns?
This may be caused by excessive printhead travel from the centering position. Enter
the Menu and set the Centering Position to MODE 1 (see Menu Mode in Chapter 3).
For wide-carriage Model ML791, if MODE 1 doesn’t work, try setting the Centering
Position to MODE 2.
54
Ploblem Solving, Maintenance, & Service
…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.
Caution! Always turn the printer off before you turn the platen knob!
If the paper lever is in the correct position and you’re using rear feed, lift up the paper
separator and check to be sure that paper is properly on the tractors and has not
jammed up somehow.
If the paper lever is in the correct position and you’re using the optional bottom-feed
push tractor, check the bottom tractor unit to be sure that paper is properly on the
tractors and has not jammed up before entering the printer.
Once the paper is correctly loaded, press and release the SEL button, then hold the
SHIFT button and press the RESET (Character Pitch) button.
…I need to load paper, but the Alarm light is not on?
If the Alarm light is off, the printer thinks it has paper loaded. To correct this problem,
press and release the SEL button, then hold the SHIFT button and press the RESET
(Character Pitch) button. The Alarm light will come on and you’ll be able to load
paper.
ML790/791 Printer Handbook
55
…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. To set your printer to ignore
the reset code, enter the printer MENU (hold SHIFT button while pressing SEL/MENU
button) and change the Reset Inhibit item (in the Set-Up group) to Yes. Please note
that while this will stop the reset code from resetting your printer, other codes in the
initialization string may still override the printer MENU and/ or front panel settings.
The I-Prime signal is sent over the parallel interface (pin 31) and will automatically
override any settings you have made using the front panel buttons. To eliminate this
problem, enter the program MENU (hold SHIFT button while pressing SEL/MENU
button) and change the I-Prime item (in the Parallel I/F group) to Invalid.
…the Print Quality and Character Pitch buttons on the front panel won’t work?
The Operator Panel Function item on the printer MENU can be used to disable these
buttons. If the printer is part of a customized system or if it is used by a number of
people, the system manager may have used this option to make sure the printer is
always set properly.
…static electricity causes the paper to stick?
In cold, dry weather, static charges can build up on continuous-form paper. This can
make the paper cling to the paper separator. If you have this problem during highvolume printing jobs, try moving the single sheet paper guides on the separator together so that the paper rests on the guides rather than on the separator itself.
56
Ploblem Solving, Maintenance, & Service
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. Slide ribbon cartridge along until it is
centered on platen, being careful not to
touch printhead.
Center
printhead
Swing front end
up to remove
ML790/791 Printer Handbook
4. Swing front-end of cartridge up off
printhead, then lift cartridge out and
discard it.
57
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.
M
1
2
Knob
3
58
Ploblem Solving, Maintenance, & Service
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.
Remove
Paper
separator
ML790/791 Printer Handbook
3. Remove the paper separator.
59
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. Turn platen knob to draw quadruplethick paper around platen. This will
bring jammed pieces of paper up and
out so you can dispose of them.
9. Back quadruple-thick sheet out of
printer using platen knob.
60
Ploblem Solving, Maintenance, & Service
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.
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61
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. Be sure to remove any shreds of paper
from printer before reloading paper.
(Open access cover and lift off pull-up
roller assembly to provide access to carriage area.)
Ploblem Solving, Maintenance, & Service
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.
Note: The built-up of dust or paper powder in
the printer, which may be occurred by some
environmental settings or media used, may
cause a mulfunction, so execute cleaning according to how the printer is dirty.
4. Reinstall pull-up roller assembly and
close access cover.
Note: When installing a pull-up roller assembly, Shift the paper lever in agreement with
the “Rear” mark before the installation.
Never use solvents or strong detergents on the cabinet–they could
damage the housing.
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63
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. Use of bottom feed eliminates the curling which
takes place as rear-feed paper moves
around the platen. Bottom feed is ideal for
card stock, thick multi-part forms, labels
which could peel off and jam the unit if
fed in from the rear, etc.
Includes tractor, support legs for printer,
and metal tear bar.
64
Ploblem Solving, Maintenance, & Service
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.
Serial Interface
Includes serial interface board and locking piece for installation in printer next to
standard parallel interface. Without interface cable.
Note: The use of the locking piece to 790/791
should be impermissible due to the exclusiveness for other models.
ML790/791 Printer Handbook
65
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
17.1 cpi
20 cpi
ML790
80 cpl
96 cpl
120 cpl
137 cpl
160 cpl
ML791
136 cpl
163 cpl
204 cpl
233 cpl
272 cpl
Emulations
Epson LQ, IBM Proprinter, IBM AGM
Interface
Standard: Centronics parallel, USB
Optional: RS-232C serial
ML790/791 Printer Handbook
67
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 utility
mode at 25% duty and 35% page density
4 million characters
Appendix A: Specifications
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.
ML790: 3" to 10"
ML791: 3" to 16"
Interleaf, multipart continuous form (orig. + 4 copies)
Rear, Bottom
10 to 12 lb paper, ML790: 3" to 10"
ML791: 3" to 16"
9 lb carbon
Labels
Bottom only
N.A.
ML790: 3" to 10"
ML791: 3" to 16"
Envelopes, single feed
Top
24 lb. max.
6.5" to 9.5"
Envelopes, continuous feed,
non-overlap type
Bottom only
24 lb. max.
6.5" to 9.5"
Card stock
Bottom only
120 lb. max
N.A.
Transparencies
Top only
ML790/791 Printer Handbook
8.5" x 11"
69
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.
70
Appendix A: Specifications
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
Setting
Printer Control
Emulation Mode
Epson LQ, IBM PPR, IBM AGM
Font
Print Mode
LQ Courier, LQ Roman, LQ Swiss, LQ Swiss
Bold, LQ Orator, LQ Gothic, LQ Prestige,
Utility, HSD
10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20 cpi
No, Yes
Normal, Italics
Single, Double
Pitch
Proportional Spacing
Style
Size
Symbol Sets
Character Set
Language Set
Zero Character
Code Page
Rear Feed
Line Spacing
Form Tear-Off
Skip Over Perforation
Page Width*
Page Length
ML790/791 Printer Handbook
Set I, Set II
American, French, German, British, Danish
I, Swedish, Italian, Spanish I, Japanese, Norwegian, Danish II, Spanish II, Latin American, French Canadian, Dutch, Publisher
Slashed, Unslashed
USA, Canada French, Multilingual, Portugal, Norway, BRASCII, Abicomp, Multilingual 858, ISO 8859-15
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"
71
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", 8.5"
1 sec, 2 sec, 500ms
by Menu Setting, by Actual Page Length
Wait Time
Page Length Control
Set-Up
Graphics
Receive Buffer Size
Paper Out Override
Print Registration 1
Print Registration 2
Operator Panel Function
Reset Inhibit
Print Suppress Effective
Auto LF
Auto CR *1
CSF Bin Select
SI Select Pitch (10 CPI) *1
SI Select Pitch (12 CPI) *1
Time Out Print
Auto Select
Graphics Speed
Centering Position
CSF Type *
72
Setting
Bi-directional, Uni-directional
64K, 128K, 1 Line, 32K
No, Yes
0, 0.05 mm Left, 0.10 mm Left, 0.15 mm Left,
0.20 mm Left, 0.25 mm Left, 0.25 mm Right,
0.25 mm Right, 0.15 mm Right, 0.10 mm Right,
0.05 mm Right
0, 0.05 mm Left, 0.10 mm Left, 0.15 mm Left,
0.20 mm Left, 0.25 mm Left, 0.25 mm Right,
0.25 mm Right, 0.15 mm Right, 0.10 mm Right,
0.05 mm Right
Full Operation, Limited Operation
No, Yes
Yes, No
No, Yes
No, Yes
Bin 1, Bin 2
17.1 CPI, 15 CPI
20 CPI, 12 CPI
Valid, Invalid
No, Yes
Low, High
DEFAULT, MODE 1, MODE 2
Wide, Narrow
Appendix B: Menu Selections
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 on Power Up, Ready on Select
200 ms, 1 sec.
DSR Signal
DTR Signal
Busy Time
CSF Bin 1 *3
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", 8.5"
CSF Bin 2 *3
Line Spacing
Bottom Margin
Page Length
6LPI, 8LPI
Valid, Invalid
11", 11 2/3", 12", 14", 17", 3", 3.5", 4", 5.5", 6",
7", 8", 8.5"
*
*1
*2
*3
*4
*5
ML 791 only
Appears only when IBM Proprinter emulation is selected.
Appears only when Epson LQ emulation is selected.
Appears only when optional Cut Sheet Feeder Accessory is installed.
Appears only when optional Serial Interface is installed.
Applicable only when the Roll Paper Stand is installed.
ML790/791 Printer Handbook
73
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. Choose Yes to make your printer
automatically perform a carriage return when a LF is received at the end of the line.
Auto LF. No (factory default) or Yes. Change to Yes if your printer overprints. Keep
this set to No if your software adds a line feed when a carriage is received at the end
of a line. If your printout is consistently double spaced, set this item to No.
Auto Select. No (factory default) or Yes. Determines whether or not your printer will
automatically be selected after you load in paper. With the factory default (No) engaged, the printer will be deselected so that you can set the Top of Form. If you always use the same Top of Form setting, change this setting to Yes so that you don’t
have to press the SEL button to select the printer after loading paper.
Auto Feed XT. Epson mode only. Invalid (factory default) or Valid. In the Epson emulation, the XT signal on pin 14 of the parallel interface can control automatic line feed.
Some interface cables are wired in such a way that automatic line feed is always in
effect: the Auto Feed XT item eliminates this potential problem. The factory setting
causes the printer to ignore this signal; if your system uses pin 14 to control automatic
line feed, change the setting to Valid.
Baud rate. Appears only if optional Serial Interface is installed. Range from 19,200 to
300 bps: factory setting, 9600 bps. This item sets the transmission rate for the system.
Bi-Direction. Enable (factory default) or Disable. Enables or disables the bi-directional transmission (PnP) in Nibble mode.
Bottom Margin. Valid (factory default) or Invalid. Sets whether or not the printer will
ignore the bottom margin setting. Change the setting to Invalid if you want printer to
ignore the bottom margin setting. Be careful if you use this feature: it lets the printer
continue printing when there’s no more paper, which can cause loss of data and may
damage the printhead.
74
Appendix B: Menu Selections
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.
Centering Position. Used to limit Printhead travel when printing narrow columns.
Select Mode 1 for Model ML790; Select Mode 1 or Mode 2 for Model ML791.
Character Set. Choose IBM Set I (factory default) or IBM Set II.
Code Page. Choose USA (factory default), Canada French, Multilingual, Portugal,
Norway BRASCII, Abicomp, Multilingual 858, ISO 8859-15.
CSF Bin Select. Appears only if optional Dual-Bin Cut Sheet Feeder is installed. Choose
Bin 1 (factory default) or Bin 2.
CSF Type. Select Wide (default) or Narrow for CSF type.
Diagnostic Test. Appears only if optional Serial Interface is installed. No (factory default) or Yes. Select Yes if you want to perform a diagnostic test of the serial interface.
DSR Signal. Applies only when optional Interface is installed. Valid (factory default) or Invalid. Used with Ready / Busy protocol to select the way your system handles the DSR Signal.
DTR Signal. Applies only when optional Serial Interface is installed. Ready on Power
Up (factory default) or Ready on Select. Change to Ready on Select if the DTR signal
is required when the printer is selected; leave as Ready on Power Up if DTR signal is
required when printer is turned on.
ML790/791 Printer Handbook
75
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. You can turn this feature off, or you can select a time interval for the printer to
wait before advancing the paper.
Graphics. Bi-directional (factory default) or Uni-directional. Bi-directional graphics
print faster than uni-directional graphics, but uni-directional graphics have better print
registration. Bi-directional graphics printing can be optimized by adjusting the Print
Registration setting in the Menu.
Graphics Speed. Low (factory default) or High. Choose High speed for faster printing when optimum print quality is not an issue.
I-Prime. Buffer Print (factory default), Buffer Clear, or Invalid. Determines how the printer
will react to the I-Prime signal from your software. With the factory default engaged,
when the printer receives the I-Prime signal, it will print out the contents of the buffer
before resetting. Change the setting to Buffer Clear if you wish the printer to dump the
contents of its buffer immediately upon receiving the I-Prime signal. Change to Invalid if
you want the printer to ignore your software’s I-Prime signal. This will permit you to
enter settings through the printer’s control panel which will not be automatically overridden by the software’s settings when the I-Prime signal is sent.
Language Set. American (factory default), French, German, British, Danish I, Swedish, Italian, Spanish I, Japanese, Norwegian, Danish II, Spanish II, Latin American,
French Canadian, Dutch, or Publisher. Replaces certain symbols with special characters used in the respective foreign languages.
Line Spacing. 6 lpi (factory default) or 8 lpi. Choose 8 lines per inch for tighter line
spacing, to get more lines per page.
Operator Panel Function. Full Operation (factory default) or Limited Operation.
Change to Limited Operation to deactivate the PRINT QUARITY and CHARACTER
PITCH buttons on the control panel. Then you can control these features only through
your software. This can be useful when several people are using the printer and you
don’t want its settings changed.
76
Appendix B: Menu Selections
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.
by Actual Page Length ..... Control page length by actual physical page length.
by Menu Setting ................ Control page length by logical page length.
Page Width. Appears in Menu for wide-carriage model only. Choose a page width of
8” (factory default) or 13.6”.
Paper out Override. No (factory default) or Yes. The paper out detector senses when
less than an inch of paper remains in the printer and stops printing at that point.
Changing this setting to Yes overrides the detector so you can print closer to the bottom of the page if you’re using single sheets. Be careful if you use this feature: it lets
the printer continue printing when there’s no more paper, which can cause loss of
data and may damage the printhead.
Parity. Appears only if optional Serial Interface is installed. None (factory default),
Odd, or Even. Selects the type of parity your system uses.
Pin 18. +5V (factory default) or Open. Sets the signal on pin 18.
Pitch. 10 cpi (factory default), 12 cpi, 15 cpi, 17.1 cpi, or 20 cpi. Selects the character
width measured in characters per inch (cpi).
Power Save Time. 5 min (factory default), 10 min, 15 min, 30 min, 60 min. Sets the
time until the printer enters the power save mode. This setting is effective when the
power saving option is enabled.
Power Saving. Enable (factory default) or Disable. Enables or disables the power save
mode. When the power save mode is enabled, the printer enters the power save mode
when the time set in the Power Save Time option elapses while the printer is idle. The
SEL LED flashes and other LED turn off when the printer enters the power save mode.
ML790/791 Printer Handbook
77
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.
Print Suppress Effective. Yes (factory default) or No. Enables/disables print suppress command. The factory default enables the print suppress command: the printer
will ignore all data it receives after it accepts the print suppress command. Change to
No to cause your printer to ignore the print suppress command.
Proportional Spacing. No (factory default) or Yes. Change to Yes to engage proportional spacing of characters.
Protocol. Appears only if optional Serial Interface is installed. Selects the type of protocol your system uses: Ready/Busy (factory default) or X-On/X-Off.
Receive Buffer Size. 64K (factory default), 128K, 1 Line, or 32K. Selects the amount of
memory devoted to holding received data. Choosing 1 Line will tie up your computer
during printing, but if you about the print job the printer will stop printing much sooner.
Reset Inhibit. No (factory default) or Yes. Change to Yes if you want your printer to
ignore the reset command sent by software. This will prevent your software reset
command from changing the settings you have made through the front panel controls or through printer commands. If you engage this feature, don’t forget that it will
also prevent your software from clearing out existing settings when you finish printing one document and switch to another.
Serial Data 7/8 Bits. Appears only if optional Serial Interface is installed. 8 Bits (factory default) or 7 Bits. Change to 7 bits if your system uses a 7-bit data format.
SI Select Pitch (10 CPI). IBM mode only. 17.1 CPI (factory default) or 15 CPI. Sets
what pitch (17.1 or 15 characters per inch) will be engaged when the printer control
panel is set for 10 cpi and the SI command is received.
SI Select Pitch (12 CPI). IBM mode only. 20 CPI (factory default) or 12 CPI. Sets what
pitch (20 or 12 characters per inch) will be engaged when the printer control panel is
set for 12 cpi and the SI command is received.
78
Appendix B: Menu Selections
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. When printing, if the printer doesn’t
receive any data, a line feed, or a form feed signal for awhile, it will automatically
dump out what’s in the print buffer. If your software spends a long time prossing
between feeding portions of data to the printer, you should change the setting to Invalid to keep your printer from inadvertently dumping the received data while it’s
waiting for more.
Wait Tine. 500 ms, 1 sec (factory default), or 2 sec. Sets the amount of the printer will
wait for more data before jumping from the print position up to the form tear off
position.
Zero Character. Slashed (factory default) or Unslashed. The factory default will cause
a slash to appear in zeros to distinguish them from the capital letter O. To disengage
the slashed zero, change this to Unslashed.
ML790/791 Printer Handbook
79
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
Horizontal Control
Carriage Return
ASCII: CR
Dec: 13
Hex: 0D
Prints data in print buffer and performs
carriage return.
Set Horizontal Tabs
ASCII: ESC D n1 n2 ··· nk NUL
Dec: 27 68 n1 n2 ··· nk 0
Hex: 1B 44 n1 n2 ··· nk 00
Sets horizontal tab stop positions.
n=position of tab stop–maximum one
less than # of characters per line
k=1 to 32; n1=0: clear tabs
Default: every 8 columns
Once tabs are set, they remain the same
even if character pitch is changed.
Horizontal Tab
ASCII: HT
Dec: 9
Hex: 09
Move to next horizontal tab stop
ML790/791 Printer Handbook
81
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(13.6" shift)
Space moved using this command will
not be underlined. DEL command will
not delete the skipped amount.
Relative Horizontal
Position
ASCII: ESC \ n1 n2
Dec: 27 92 n1 n2
Hex: 1B 5C n1 n2
Move to new horizontal position, relative to present position. Amount of
movement is calculated as follows:
– (n 1+ [n2x256] x (basic unit in inches),
where the basic unit is set by ESC (U, set
unit command. The default of the basic
unit with LQ is 1/180 inch, and with
UTL it is 1/120 inch.
n1=0 to 255
n2=0 to 255
n1=n2=0: no movement
+ moves to right; - moves to left
Set Print Position
ASCII: ESC DLE @ Pn A1 A2 P1 P2
P3 P4
Dec: 27 16 64 [data]
Hex: 1B 10 40 [data]
OKI unique command. Sets next horizontal position of printhead.
Pn= number of parameter bytes to follow, range 0 to 255
A1= specifies whether motion is absolute or relative: even-absolute from
left margin; odd=relative from present
position
A2= specifies direction of relative
movement: even= toward right margin
(forward); odd= toward left margin (reverse)
0 † P 1, P2, P3, P4 † 9 representing
number of units to move (size of unit
depends on character pitch)
82
Appendix C: Printer Commands
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.
n=1 to 255
n=0: command ignored
Auto Justification
ASCII: ESC a n
Dec: 27 97 n
Hex: 1B 61 n
Justifies text according to the value of
n:
n=0: Left
n=1: Center
n=2: Right
n=3: Full (left & right)— use carriage
return only at end of paragraph.
Unidirectional Print On/
Off
ASCII: ESC U n
Dec: 27 85 n
Hex: 1B 55 n
Turns unidirectional (left to right only)
printing on and off.
n=1: Unidirectional printing On
n=0: Unidirectional printing Off (normal
bidirectional printing)
One-line Unidirectional
Printing
ASCII: ESC <
Dec: 27 60
Hex: 1B 3C
Turns on unidirectional (left to right)
printing for one line.
Backspace
ASCII: BS
Dec: 8
Hex: 08
Prints data in print buffer and moves
one character to the left according to the
current character pitch.
Delete One Character
ASCII: DEL
Dec: 127
Hex: 7F
Deletes last character in print buffer.
Set 1/6-inch
Line Spacing
ASCII: ESC 2
Dec: 27 50
Hex: 1B 32
Sets line spacing of 1/6-inch (6 lines per
inch). This is standard typewriter spacing.
Set 1/8-inch
Line Spacing
ASCII: ESC 0
Dec: 27 48
Hex: 1B 30
Sets line spacing of 1/8-inch (8 lines per
inch).
Vertical Control
ML790/791 Printer Handbook
83
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. ESC [ n is
OKI unique command
n=0 to 255
n=0: no line feed
Line Feed
ASCII: LF
Dec: 10
Hex: 0A
Prints buffer data and moves the printhead by the current line spacing value.
Cancels SO and ESC SO commands.
n/ -inch Line Feed
180
ASCII: ESC J n
Dec: 27 74 n
Hex: 1B 4A n
Executes one n/180-inch line feed without changing line spacing.
n=0 to 255
n=0: no line feed, but initiates printing
n/ -inch Reverse Line
180
ASCII: ESC j n
Dec: 27 106 n
Hex: 1B 6A n
Executes one n/180-inch reverse line
feed without changing line spacing.
n=0 to 255
n=0: no line feed, but initiates printing
n/ -inch Line Feed
360
ASCII: ESC ] n
Dec: 27 93 n
Hex: 1B 5D n
OKI unique command. Executes n/360inch line feed without changing line
spacing.
n=0 to 255
n=0: no line feed, but initiates printing
Set relative vertical print
position
ASCII: ESC (v n1 n2 m1 m2
Dec: 27 40 118 n1 n2 m1 m2
Hex: 1B 28 76 n1 n2 m1 m2
Performs carriage return in the forward
or reverse direction from the current
position.
n1=2, n2=0: specifies the number of
parameters (inbytes) to follow Amount
of carriage returns executed=– (m1 +[m2
x256]) x (basic unit in inches) The basic
unit is set by set unit command ESC (U.
The default of basic unit is 1/360 inch.
Forward feeding exceeding approx. 46.2
inches and reverse feeding exceeding
approx. 0.5 inch are invalid. Reverse
feeding is invalid in raster graphics
mode.
Feed
84
Appendix C: Printer Commands
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.
n1=2, n2=0: specifies the number of
parameters (in bytes) to follow Amount
of carriage returns executed=– (m1 + [m2
x 256]) x (basic unit in inches) The basic
unit is set by set unit command ESC (U.
The default of basic unit is 1/360 inch.
Forward feeding exceeding approx. 46.2
inches and reverse feeding exceeding
approx. 0.5 inch are invalid.
It is a print carriage return execution
command, which does not involve returning to pervious settings following
the execution of this command.
Form Feed
ASCII: FF
Dec: 12
Hex: 0C
Prints data in buffer and advances paper
to next top of form. Canceles SO and
ESC SO command. With Cut Sheet
Feeder, inserts or ejects paper depending
on status of paper when command is issued.
Vertical Tab
ASCII: VT
Dec: 11
Hex: 0B
Print buffer data and move to next vertical tab stop.
Set Vertical Tab Stops
ASCII: ESC B n1 n2 ÆÆÆ nk NUL Sets vertical tab stops at specified lines
relative to Top of Form position.
Dec: 27 66 n1 n2 ÆÆÆ nk 0
k=1 to 16: number of tabs
Hex: 1B 42 n1 n2 ÆÆÆ nk 00
n=1 to 255: line number where tab is to
be set.
n=0: clears tab setting for Vertical
Format Unit channel 0
ML790/791 Printer Handbook
85
Epson
Function
Commands
(ASCII, Decimal, Hexadecimal) Notes
Set Vertical Format Unit
(VFU)
ASCII: ESC b m n1 n2 ÆÆÆ nk NULPrograms up to 8 separate sets (chanDec: 27 96 m n1 n2 ÆÆÆ nk 0
nels) of vertical tab stops.
m=0 to 7: channel number (0 is default
Hex: 1B 62 m n1 n2 ÆÆÆ nk 00
set by ESC B command)
k=1 to 16: number of tab stops in channel
n=1 to 255: number of lines down from
Top of Form position
n=0: clear tab settings for channel m
Select Vertical Tab Channel
ASCII: ESC / n
Dec: 27 47 n
Hex: 1B 2F n
Activates preprogrammed vertical tab
channel n. VT moves to stops in this
channel.
n=0 to 7: channel number (0 is default)
Set Page Length in Lines
ASCII: ESC C n
Dec: 27 67 n
Hex: 1B 43 n
Sets page length in lines. Current position becomes top of form. Printer calculates page length vy multiplying current
line feed pitch by value entered for "n".
n=1 to 255.
Cancels Skip over Perforation setting.
Page length set by this command will
not change even if line spacing is
changed.
Set Page Length in Inches ASCII: ESC C NUL n
Dec: 27 67 0 n
Hex: 1B 43 00 n
Set page length in defined ASCII: ESC (C n1 n2 m1 m2
unit
Dec: 27 40 67 n1 n2 m1 m2
Hex: 1B 28 43 n1 n2 m1 m2
86
Sets page length in inches. Current position becomes top of form.
n=1 to 22.
Cancels Skip over Perforation setting.
Sets the page length to the currently selected paper mode.
n1=2, n2=0: specifies the number of
parameters (in bytes) to follow Amount
of carriage returns executed= – (m1 +
[m2 x 256]) x (basic unit in inches) The
basic unit is set by set unit command
ESC (U.
The default of basic unit is 1/360 inch.
Page length selection exceeding 22 inches is invalid.
This command is invalid when
m1=m2=0.
Skip Over Perforation feature is deactivated by this command.
Appendix C: Printer Commands
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.
Skip Over Perforation feature is deactivated by this command.
Set Skip Over Perforation
area
(bottom margin)
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. When Perforation Skip area is
entered, printer will automatically feed
paper down to top of form on next page.
Once this command is entered, the Skip
Over Perforation setting will remain the
same even if line spacing is changed.
n=1 to 255
Cancel Skip Over Perfora- ASCII: ESC O
tion
Dec: 27 79
Hex: 1B 4F
Deactivates Skip Over Perforation. Command overrides menu.
Cut Sheet Feeder
Option
Cut Sheet Feeder Control
ASCII: ESC EM n
Dec: 27 25 n
Hex: 1B 19 n
Controls Cut Sheet Feeder accessory.
n=1: Select bin 1
n=2: Select bin 2 (if present)
n=73 (ASCII "I"): Insert sheet
n=82 (ASCII "R"): Eject sheet
ASCII: ESC : 0 n 0
Dec: 27 58 0 n 0
Hex: 1B 3A 00 n 00
Copies the designated character set to
the user defined set in RAM:
n=0: Roman
n=1: Swiss
n=2: Courier
n=3: Prestige
n=7: Orator
n=122: Swiss Bold
n=124: Gothic
n=126: MENU setting
Character Sets
Copy ROM Character Set
to RAM Character Set
ML790/791 Printer Handbook
87
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.
Custom Character Set
On/ Off
ASCII: ESC % n
Dec: 27 37 n
Hex: 1B 25 n
Engages/ disengages custom character
set.
n=0: Select custom character set
n=1: Select default character set
Select International
Character Set
(set Code Page)
ASCII: ESC R n
Dec: 27 82 n
Hex: 1B 52 n
Select character set containing 15 special
characters used in foreign language
printing:
n=0: American n=26: Multilingual
n=1: French
n=27: Norway
n=2: German
n=28: Portugal
n=3: British
n=42: Canada French
n=4: Danish I
n=80: BRASCII
n=5: Swedish
n=81: Abicomp
n=6: Italian
n=82: ISO 8859-15
n=7: Spanish I
n=83: Multilingual 858
n=8: Japanese
n=9: Norwegian
n=10: Danish
n=11: Spanish II
n=12: Latin American
n=13: French Canadian
n=14: Dutch
n=64: Publisher
Assign character table
ASCII: ESC (t n1 n2 d1 d2 d3 Dec:
27 40 116 n1 n2 d1 d2 d3
Hex: 1B 28 74 n1 n2 d1 d2 d3
The character tables indicated by d2, d3 are
stored in the four types of areas indicated by
d1 (Character Table 0-3). From among the four
tables, one is selected by ESC t command.
n1=3, n2=0: specifies the number of parameters (in bytes) to follow
d1=0 to 3: stored character table number.
d2, d3=0, 0: Italic
d2, d3=1, 0: PC 437 (USA)
d2, d3=3, 0: PC 850 (Multilingual)
d2, d3=7, 0: PC 860 (Portugal)
d2, d3=8, 0: PC 863 (Canada-French)
d2, d3=9, 0: PC 865 (Norway)
d2, d3=25, 0: BRASII
d2, d3=26, 0: Abicomp
Appendix C: Printer Commands
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 re-allocation.
Character Table 3: PC 437 (USA)
Print data as character table
ASCII: ESC (^ n1 n2 [data]
Dec: 27 40 94 n1 n2 [data]
Hex: 1B 28 5E n1 n2 [data]
All [data] become printing data. All
codes of 01H-FF are treated as printing
data. 00H code is ignored as Null code.
The number of printing data (in bytes) to
follow are indicated by n1 and n2.
Number of printing data (in bytes)=n1 +
[n2 x 256]
Permit printing of upper
range control codes
ASCII: ESC 6
Dec: 27 54
Hex: 1B 36
Enables printing of characters in upper
ASCII code range (128 to 159).
Cancel printing of upper
range control codes
ASCII: ESC 7
Dec: 27 55
Hex: 1B 37
Cancels ESC 6 command.
Bar Code Command
Select Bar Code Type and ASCII: ESC DLE A m n1 ÆÆÆ n8 m is number of parameters specified: 2,
Size
4, 5, 6, 7, or 8
Dec: 27 16 65 m n1 ÆÆÆ n8
n1, n2 set bar code style as follows:
Hex: 1B 10 41 m n1 ÆÆÆ n8
n1, n2=0, 1: EAN8
n1, n2=0, 2: EAN13
n1, n2=1, 0: UPC-A
n1, n2=1, 4: UPC-E
n1, n2=2, 0: CODE 39
n1, n2=3, 0: Interleaved 2 of 5
n1, n2=4, 0: Code 128
ML790/791 Printer Handbook
89
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.
n6 sets spacing
n7 sets ratio of wide element to narrow
element
n8: Specifies whether or not characters
are to be attached
n8=0: characters not attached
n8=1 or more: LQ characters attached
90
Print Industrial Bar Code
Data
ASCII: ESC DLE B m n [data]
Dec: 27 16 66 m n [data]
Hex: 1B 10 42 m n [data]
Prints bar code data.
m=amount of data (in bytes) to follow n
specifies Code 128 mode (when Code
128 is selected) as follows: n=65: Set A
n=66: Set B
n=67: Set C
Print Postnet Bar Code
Data
ASCII: ESC DLE C n [data]
Dec: 27 16 67 n [data]
Hex: 1B 10 43 n [data]
n=amount of data (in bytes) to follow:
n=1 to 20
Data consists of single-digit numbers
(0 to 9).
Print Bar Code
ASCII: ESC (B Ln Hn k m S v1 v2 c
DATA
Dec: 27 40 66 Ln Hn k m S v1 v2 c
DATA
Hex: 1B 28 42 Ln Hn k m S v1 v2 c
DATA
Select Barcode type and Print Barcode.
Ln Hn: number of parameter, number of
parameter=Ln + Hn x 256
k: Barcode type 00=EAN13, 1=EAN8,
2=I20f5, 3= UPC-A, 4= UPC-E,
5=Code39, 6= Code128, 7= Postnet
m: module width (black and white bar),
2= 2 dots, 3= 3 dots, 4= 4 dots, 5= 5
dots (unit: 1/180")
s: adjustment of white bar, FDH=-3,
FEH=-2, FFH=-1, 00H=0, 01H=+1,
02H=+2, 03H=+3 (unit: 1/360")
v1, v2: specifies the height, height=
v1+v2x256 (unit: 15/180")
c: control information
bit0 check digit 0: no, 1= yes
bit1 human-readable character 0:
yes, 1= no
DATA: barcode data
Appendix C: Printer Commands
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.
n= 0: Utility
n= 1: HSD
Select LQ Typeface
ASCII: ESC k n
Dec: 27 107 n
Hex: 1B 6B n
n=0: Roman
n=1: Swiss
n=2: Courier
n=3: Prestige
n=7: Orator
n=122: Swiss Bold
n=124: Gothic
n=126: MENU setting
Select font by pitch and
point
ASCII: ESC X m n1 n2
Dec: 27 88 m n1 n2
Hex: 1B 58 m n1 n2
Selects Multipoint (scalable font) mode.
Printable font is selected by character
pitch and point
Character pitch
m=0: unchanged
m=1: Proportional
m>5: m /360 inch
Point size=(n1 + [n2 x 256]) x 0.5 point
Point size can be selected between a
minimum of 8 point to a maximum of 64
point.
ML790/791 Printer Handbook
91
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.
Select 15 cpi Pitch
ASCII: ESC g
Dec: 27 103
Hex: 1B 67
Selects 15 cpi pitch.
Select Compressed Print
ASCII: SI or ESC SI
Dec: 15 or 27 15
Hex: 0F or 1B 0F
Pitch depends on current pitch selected:
10 cpi becomes 17.1 cpi
12 cpi becomes 20 cpi
Cancel Compressed Print
ASCII: DC2
Dec: 18
Hex: 12
Cancels 15 cpi print selected by SI or
ESC SI command.
Set Character Spacing
ASCII: ESC SP n
Dec: 27 32 n
Hex: 1B 20 n
Adds n dots of space (depending on the
current pitch) between characters.
n=0 to 127
Select horizontal motion
index (HMI)
ASCII: ESC c n1 n2
Dec: 27 99 n1 n2
Hex: 1B 63 n1 n2
Sets the amount of space between characters (HMI).
HMI= (n1+ [n2 x 256])/ 360 inch.
The specification is invalid if HMI exceeds 3 inches.
The command is invalid when n1=n2=0.
Select Italic Characters
ASCII: ESC 4
Dec: 27 52
Hex: 1B 34
See also ESC !, ESC 7.
Cancel Italics
ASCII: ESC 5
Dec: 27 53
Hex: 1B 53
Clears italic printing engaged by ESC 4
command.
Appendix C: Printer Commands
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.
jand h specify amount of data to follow,
calculated as j + h x 256
n1= 1: Start underline
n1= 2: Start strike through
n1= 3: Start overscore
n2= 0: Cancel score mode selected by n1
n2= 1: Start single continuous line
n2= 2: Start double continuous line
n2= 5: Start single dashed line
n2= 6: Start double dashed line
Turn Underlining on/ off ASCII: ESC - n
Dec: 27 45 n
Hex: 1B 2D n
Underlines all text except tabs.
n= 1: Start underlining
n= 0: Stop underlining
Start Superscript/
Subscript
ASCII: ESC S n
Dec: 27 83 n
Hex: 1B 53 n
n= 0: Start superscript
n= 1: Start subscript
Stop Superscript/
Subscript
ASCII: ESC T
Dec: 27 84
Hex: 1B 54
Select Character Style
ASCII: ESC q n
(normal, shadow, outline, Dec: 27 113 n
outline& shadow)
Hex: 1B 71 n
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. See also
ESC ! command.
Override MENU until Initialize, Software I-PRIME or Change Emulation
command is received, or until printer is
turned off.
Stop Emphasized
Printing
ASCII: ESC F
Dec: 27 70
Hex: 1B 46
Clears emphasized printing engaged by
ESC E command.
Start Enhanced (Double
Strike) Printing
ASCII: ESC G
Dec: 27 71
Hex: 1B 47
Prints vertically shifted double dots in
two passes. See also ESC ! command.
ML790/791 Printer Handbook
93
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.
Stop Immediate Double
Width Printing
ASCII: DC4
Dec: 20
Hex: 14
Only cancels double width set by SO or
ESC SO.
Double Height Printing
ASCII: ESC w n or ESC US n
Dec: 27 119 n or 27 31 n
Hex: 1B 77 n or 1B 1F n
OKI unique command
n= 1: Start double height
n= 0: Stop double height
ASCII: ESC * m n1 n2[graphic data]
Dec: 27 42 m n1 n2[graphic data]
Hex: 1B 2A m n1 n2[graphic data]
Selects 8-pin and 24-pin graphic modes
and prints graphic data.
m= 0: Single density, 8-pin 60 dpi
m= 1: Double density, 8-pin, 120 dpi
m= 2: Double speed, double density, 8pin, quasi-120 dpi (dots can not be printed directly adjacent to one another)
m= 3: Quadruple density, 8-pin, quasi240 dpi (dots can not be printed directly
adjacent to one another)
m= 4: CRT I, 8-pin, 80 dpi
m= 6: CRT II, 8-pin, 90 dpi
m= 32: Single density, 24-pin, 60 dpi
m= 33: Double density, 24-pin, 120 dpi
m= 38: CRT III, 24-pin, 90 dpi
m= 39: Triple density, 24-pin, 180 dpi
m= 40: Hex-density, 24-pin, quasi-360
dpi (dots can not be printed directly adjacent to one another)
Graphics, 8 & 24-pin
Mode
For all graphics commands the number of dot
columns of graphic data
is as follows: dots= n1 +
(n2 x 256)
Graphics Select/ Print
94
Appendix C: Printer 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.
Maximum data per line: ML390
Turbo=480: ML391 Turbo=816
n1, n2= 0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as n1 + (n2 x 256)
Double Density Graphics
ASCII: ESC L n1 n2 [graphic data]
Dec: 27 76 n1 n2 [graphic data]
Hex: 1B 4C n1 n2 [graphic data]
Dot density 120 dpi horizontal, 72 dpi
vertical.
Maximum data per line: ML390 Turbo=
960: ML391 Turbo= 1632
n1, n2= 0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as n1 + (n2 x 256)
Quasi Double Density
Graphics
ASCII: ESC Y n1 n2 [graphic data]
Dec: 27 89 n1 n2 [graphic data]
Hex: 1B 59 n1 n2 [graphic data]
Same as double density graphics (120
dpi), but printer can’t put two adfacent
dots in the same row.
Quadruple Density
Graphics
ASCII: ESC Z n1 n2 [graphic data]
Dec: 27 90 n1 n2 [graphic data]
Hex: 1B 5A n1 n2 [graphic data]
Dot density 240 dpi horizontal, 72 dpi
vertical. Printer can’t put two adjacent
dots in the same row.
Maximum data per line: ML390 Turbo=1920: ML391 Turbo=3264
n1, n2= 0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as n1 + (n2 x 256)
Reassign Graphics
ASCII: ESC ? m n
Dec: 27 63 m n
Hex: 1B 3F m n
Converts ESC K, ESC L, ESC Y, or ESC Z
command to a graphics select command:
For ESC K: m=75
For ESC L: m=76
For ESC Y: m=89
For ESC Z: m=90
n=0: Single density, 60 dpi
n=1: Double density, 120 dpi
ML790/791 Printer Handbook
95
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.
n=0: 10 cpi
n=1: 12 cpi
n=2: Proportional spacing
n=4: Compressed
n=8: Emphasized
n=16: Enhanced
n=32: Double Width
n=64: Italics
n=128: Underlining
Select emulation mode
ASCII: ESC { n
Dec: 27 123 n
Hex: 1B 7B n
OKI unique command. Switches printer
emulation mode, copying the custom
character data in buffer and saving the
print and receive buffers.
MENU settings unaffected.
n=0: IBM mode (general)
n=2: IBM X24e PPR, XL24e PPR
n=3: IBM X24e AGM, XL24e AGM
n=64: Epson mode (general)
n=66: Epson LQ 850, LQ 1050
Initialize printer
ASCII: ESC @
Dec: 27 64
Hex: 1B 40
Clears print buffer (receive buffer unaffected), resets printer to menu defaults,
current position becomes top of page.
Custom character data is not touched.
This command is acknowledged only if
Reset Inhibit in MENU is set to " No"
(factory default).
Cancel
ASCII: CAN
Dec: 24
Hex: 18
Clears print buffer (receive buffer unaffected) and executes carriage return;
commands and custom character data
unaffected.
Composite Command
Miscellaneous
96
Appendix C: Printer Commands
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.
Print Suppress Mode On
ASCII: DC3
Dec: 19
Hex: 13
Places printer in Print Suppress Mode
after printing data in print buffer.
Ignores all further commands except
DC1 command.
Print Suppress Effective item in MENU
must be set to "Yes" for this command to
be acknowledged.
Print Suppress Mode Off
ASCII: DC1
Dec: 17
Hex: 11
Clears Print Suppress Mode, re-activating printer to once again process all data
received.
Disable Paper-Out
Sensor
ASCII: ESC 8
Dec: 27 56
Hex: 1B 38
OKI unique command. Disables paperout sensor, even if Paper Out Override
in MENU is set to "On" the (factory default). If data flows onto next page and
reaches top of form setting for that page,
printer ALARM light will come on to indicate paper-out error.
Enable Paper-Out
Sensor
ASCII: ESC 9
Dec: 27 57
Hex: 1B 39
OKI unique command. Enables paperout sensor to detect when less than 1/2
inch of paper is left. When ALARM light
is on, pressing SELECT prints 1 line of
data at a time until the top of form setting for the next page is reached.
Sensor can also be controlled by the
menu.
Half-Speed
Printing On/ Off
ASCII: ESC s n
Dec: 27 115 n
Hex: 1B 73 n
Prints at 50% of normal speed to reduce
noise.
n=1: Half-speed printing On
n=0: Half-speed printing Off
ML790/791 Printer Handbook
97
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.
n1=1, n2=0: specifies the number of
parameters (in bytes) to follow
The commands affected by this command are:
ESC (V, ESC (v, ESC \, ESC $, ESC (C,
ESC (c.
Set/ Reset Incremental
Print Mode
ASCII: ESC i n
Dec: 27 105 n
Hex: 1B 69 n
Sets the Incremental print mode
n=0: Reset Incremental print mode
n=1: Set Incremental print mode
Raster Graphics
Select graphics mode
ASCII: ESC ( G n1 n2 m
Dec: 27 40 71 n1 n2 m
Hex: 1B 28 47 n1 n2 m n1=1,
Sets the raster graphics mode.
n2=0: specifies the number of parameters (in bytes) to follow
This command can be deactivated by
ESC @ (printer initialization). The raster
graphics command ESC is valid only
while in this mode.
The printer is initialized by this command.
Appendix C: Printer Commands
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.
Dec: 27 46 Pc Pv Ph Pm n1 n2 [data]
Hex: 1B 2E Pc Pv Ph Pm n1 n2 [data] Pc: mode setting
Pc=0: full graphics mode
Pc=1: compressed mode
Pv: vertical direction dot density setting
Pv=10: 3600/Pv → 360 DPI
Pv=20: 3600/Pv → 180 DPI
Ph: horizontal direction dot density setting
Ph=10: 3600/ Ph → 360 DPI
Ph=20: 3600/ Ph → 180 DPI
Pm: horizontal direction dot number
Horizontal direction dot number=n1 +
[n2 x 256]
The command is ignored when
Pv=10 and Ph=20.
ML790/791 Printer Handbook
OKI unique command. Activates and
deactivates raster graphics mode.
Pn0=1: specifies the number of parameters (in bytes) to follow
Pn=odd number: raster graphics mode
activated
Pn=even number: raster graphics mode
deactivated
99
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.
IBM
Function
Commands
(ASCII, Decimal, Hexadecimal) Notes
Horizontal Control
Carriage Return
ASCII: CR
Dec: 13
Hex: 0D
Set Horizontal Tabs
ASCII: ESC D n1 n2 ÆÆÆ nk NUL Sets horizontal tab stop positions.
n=1 to 255: specifies position of tab stopDec: 27 68 n1 n2 ÆÆÆ nk 0
maximum is number of characters per
Hex: 1B 44 n1 n2 ÆÆÆ nk 00
line
k=1 to 28; n1=0: clear tabs
Default: every 8 columns
Horizontal Tab
ASCII: HT
Dec: 9
Hex: 09
Move to next horizontal tab stop
Reset Tabs to Default
ASCII: ESC R
Dec: 27 82
Hex: 1B 52
Reset horizontal tabs for default: every
8th character. Also resets vertical tabs to
default of 1 line.
ML790/791 Printer Handbook
Prints data in buffer and performs carriage return.
101
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. m must be at least
10 character space (at 10 cpi) to the right
of n.
n=0 to 255; n=0: left margin unchanged
m=0 to 255; m=0: right margin unchanged
Engage/ Disengage
Unidirectional Printing
ASCII: ESC U n
Dec: 27 85 n
Hex: 1B 55 n
n=1: Unidirectional printing On
n=0: Unidirectional printing Off (return
to bidirectional)
Backspace
ASCII: BS
Dec: 8
Hex: 08
Prints data in buffer and moves one
character to the left according to current
character pitch.
Set Print Position
ASCII: ESC DLE @ Pn A1 A2 P1 P2
P3 P4
Dec: 27 16 64 [data]
Hex: 1B 10 40 [data]
OKI unique command. Sets horizontal
position of printhead.
Pn: specifies number of bytes to follow,
range 0 to 127 (MSB ignored)
A1: specifies if motion is absolute (even
number) or relative (odd number)
A2: specifies direction of relative movement right (even number) or left (odd
number)
P1, P2, P3, P4=0 to9: specify print position, in four digits:
(P1 x 1000) + (P2 x 100) + (P3x 10) + P4
Unit of print position is 1/360 inch in LQ
mode; 1/240 inch in Utility mode.
Maximum default value for left and
right margins: 2880 for ML390 Turbo:
4896 for ML 391 Turbo
Appendix D: Printer Commands
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/ -inch Line Spacing=8 lines per inch.
8
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).
Set n/72-inch or
n/60-inch
Line Spacing
ASCII: ESC A n
Dec: 27 65 n
Hex: 1B 41 n
In PPR emulation, sets and stores n/72inch line spacing; in AGM emulation,
sets and stores n/60-inch line spacing.
The ESC 2 command must be sent to initiate the line spacing change.
n=1 to 255
n=0: no change in line sapcing.
Set n/360-inch
Line Spacing
ASCII: ESC % 8 n
Dec: 27 37 56 n
Hex: 1B 25 38 n
OKI unique command. Sets line spacing
to n/360-inch.
n=1 to 255
n=0: no line feed
Set n/216-inch or n/180inch
Line Spacing
ASCII: ESC 3 n
Dec: 27 51 n
Hex: 1B 33 n
For PPR emulation, sets n/216-inch line
spacing; for AGM emulation, sets
n/180=inch line spacing.
n=1 to 255
n=0: command is ignored
Line Feed
ASCII: LF
Dec: 10
Hex: 0A
Prints buffer data and moves printhead
down by current by current line spacing
value. In PPR emulation, performs carriage return only if Auto CR in MENU
has been changed to Yes (factory default
is No). In AGM emulation performs carriage return regardless of Auto CR setting.
Reverse Line Feed
ASCII: ESC ]
Dec: 27 93
Hex: 1B 5D
Prints buffer data and performs one reverse line feed at the current line spacing. Movement will not go above top of
form. Not recommended for use with
optional pull tractor.
ML790/791 Printer Handbook
103
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/360-inch Line Feed
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.
n=1 to 255
n=0: no line feed
n/ -inch or n/ -inch
216
180
ASCII: ESC J n
Dec: 27 74 n
Hex: 1B 4A n
Form Feed
ASCII: FF
Dec: 12
Hex: 0C
Vertical Tab
ASCII: VT
Dec: 11
Hex: 0B
Line Feed
Set Vertical Tab Stops
Set Form Length in
Inches
104
In PPR emulation, prints data in buffer
and executes a single n/216-inch line
feed: in AGM emulaiton, executes a single n/180-inch line feed, both without
changing line spacing. Carriage Return
determined by menu setting.
n=1 to 255
n=0: no line feed
Prints data in buffer and advances paper to next top of form. With Cut Sheet
Feeder installed, will eject or insert paper depending on status of feeder.
Print buffer data and move to next vertical tab stop.
Sets vertical tab stops at specified lines.
ASCII: ESC B n1 n2 ÆÆÆ nk NUL k=1 to 64: number of tabs
n=1 to 255: line number where tabs is to
Dec: 27 66 n1 n2 ÆÆÆ nk 0
be set
Hex: 1B 42 n1 n2 ÆÆÆ nk 00
ASCII: ESC C NUL n
Dec: 27 67 0 n
Hex: 1B 43 00 n
Sets page length in inches.
n=1 to 255 inches
n=0: Command ignored
This command cancels Skip Over Perforation setting.
Appendix D: Printer Commands
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. When the printer reaches the
bottom of the page, it will skip n lines to
next top of form. Command overrides
menu.
n=1 to 255 lines
n=0: command ignored
Cancel Skip Over
Perforation
ASCII: ESC O
Dec: 27 79
Hex: 1B 4F
Deactivates Skip Over Perforation.
Command override menu.
Set Top of Form
ASCII: ESC 4
Dec: 27 52
Hex: 1B 34
Sets top of form at current printhead
position. Command ignored in CSF or
Auto-Feed mode.
ASCII: ESC EM n
Dec: 27 25 n
Hex: 1B 19 n
OKI unique command. Controls Cut
Sheet Feeder accessory.
n=1: Select bin 1
n=2: Select bin 2 (if present)
n=73 (ASCII "I" ): Insert sheet
n=82 (ASCII "R" ): Eject sheet
Cut Sheet Feeder
(Option)
Cut Sheet Feeder Control
ML790/791 Printer Handbook
105
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.=1040: BRASCII
ID No.=1041: Abicomp
Select International
Character Set
ASCII: ESC ! n
Dec: 27 33 n
Hex: 1B 21 n
OKI unique command. Select character
set containing special characters used in
foreign language printing:
n=64: US ASCII, slashed zero
n=65: US ASCII (unslashed zero)
n=66: British
n=67: German
n=68: French
n=69: Swedish
n=70: Danish
n=71: Norwegian
n=72: Dutch
n=73: Italian
n=74: French Canadian
n=75: Spanish
n=76: Latin American
n=90: Publisher
Print from IBM
Character Set III
ASCII:ESC \ n1 n2
Dec: 27 92 n1 n2
Hex: 1B 5C n1 n2
This character set includes printable
characters for commands. Specify total
number of characters to be printed, calculated as n1 + (n2 x 256).
Print One Character
from IBM Character
Set III
ASCII: ESC ^ n
Dec: 27 94 n
Hex: 1B 5E n
Prints character n from IBM Character
Set III n=0 to 255.
Appendix D: Printer Commands
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 ÆÆÆ n8
Size
Dec: 27 16 65 m n1 ÆÆÆ n8
Hex: 1B 10 41 m n1 ÆÆÆ 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, n2=0, 2: EAN13
n1, n2=1, 0: UPC-A
n1, n2=1, 4: UPC-E
n1, n2=2, 0: CODE39
n1, n2=3, 0: Interleaved 2 of 5
n1, n2=4, 0: Code 128
n3, n4: sets vertical length of bars, in
units of 15/180-inch, calculated as ([n3 x
10] + n4) x 15/180"
n5: sets black bars; n5=1 to 7
n6: sets spacing; n6=1 to 7
n7: sets ratio of wide element to narrow
element; n7=1 to 7
n8: specifies whether or not characters
are to be attached
n8=0: characters not attached
n8=1 or more: LQ characters attached
Print Industrial Bar Code
Data
ML790/791 Printer Handbook
ASCII: ESC DLE B n m [data]
Dec: 27 16 66 n m [data]
Hex: 1B 10 42 n m [data]
OKI unique command
n: specifies amount of data to follow
m: selects CODE128 mode (CODE128
must be selected for this command to be
recognized)
m=65: Set A
m=66: Set B
m=67: Set C
107
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.
byte number of parameter = Ln+Hn x 256
Pk: Barcode type
Pk (Hex)
B2
B3
B4
B6
B7
B9
BA
Barcode type
EAN-13
EAN-8
Code 39
Interleaved 2 of 5
UPC-A
POSTNET
Code 128
Pm: specifies the module width (black or
SP bar).
Pm (Hex) Module width (unit: 1/180")
00
2 dots
01
1 dot
02
2 dots
03
3 dots
04
4 dots
Ps: specifies the PS bar width based on
the parameter Pm setting.
Ps (Hex) regulable value for the standard width of the SP bar.
FD
-3
FE
-2
FF
-1
00
0 (factory default)
01
+1
02
+2
03
+3
Lv Hv: specifies the height of the black
bar (unit: 1/2160")
Height=Lv+Hv x 256
Lv Hv setting will be ignored for
Pk=07H (when POSTNET specified)
108
Appendix D: Printer Commands
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.
Ln Hn: indicates the byte number (=
Ln+Hn x 256) of the parameter located
after Ln Hn
DATA: Barcode data
Select LQ Typeface
ASCII: ESC k n
Dec: 27 107 n
Hex: 1B 6B n
OKI unique command. Selects typeface
according to value of n:
n=0: Roman
n=1: Swiss
n=2: Courier
n=3: Prestige
n=4: Script
n=5: OCR-B
n=6: OCR-A
n=7: Orator
n=8: Orator-S
n=122: Swiss Bold
n=124: Gothic
Select Font
ASCII: ESC [I j h Hfid Lfid Hfwd Lfwd fa
Nul Hc Lc
Dec: 27 91 73 j h Hfid Lfid Hfwd Lfwd fa
Nul Hc Lc
Hex: 1B 5B 49 j h Hfid Lfid Hfwd Lfwd
fa Nul Hc Lc
Sets the font typeface, character width
and spacing attributes.
j, h: set number of parameters to follow,
calculated as j + (h x 256) bytes
j, h=0 or1: command invalid
j, h=2, 3: fid setting valid, other modes
unchanged
j, h=4: fid, fwd settings valid; fa unchanged
j, h=5: all settings valid
j, h=6 or more: all settings and parameter
data beyond 6 bytes will be ignored
Print Barcode
Print Features
ML790/791 Printer Handbook
109
IBM
Function
Commands
(ASCII, Decimal, Hexadecimal) Notes
Hfid, Lfid: sets font typeface, calculated
as (Hfid.Lfid=(Hfid x 256) + Lfid
Hfwd, Lfwd: Sets character width (cpi),
calculated as
Hfwd, Lfwd=(Hfwd x 256) + Lfwd
fa: sets spacing attribute;
n=2: prints Proportional;
n=any other value, cpi set by Hfwd, Lfwd
Hc Lc: Code page setting, ID=Hc x
256+Lc
Code page ID (Hex)
1B5
352
35A
35C
35F
361
410
411
439
Select Print Quality
ASCII: ESC [ d Ln Hn Pn
16-digit: 1B 5B 64 Ln Hn Pn
10-digit: 27 91 100 Ln Hn Pn
Code page name
USA
Multilingual
Multilingual 858
Portugal
Canada French
Norway
BRASCII
Abicomp
ISO 8859-15
Specifies the Print Quality setting.
Ln Hn specifies the number of parameter (Ln, Hn).
Number of parameter= Ln+Hn x 256
Pn: Parameter Quality setting
Pn
00H
invalid
01H-3FH
HSD
40H-7FH
Utility
80H-FEH
LQ
FFH
(depending on the menu settings)
Select font by pitch and
point
110
ASCII: ESC DLE F Pn0 m n1 n2
Dec: 27 16 70 Pn0 m n1 n2
Hex: 1B 10 46 Pn0 m n1 n2
Sets the Multipoint (scalable font) mode.
Printable font is selected by character
pitch and point.
Pn0=3: specifies the number of parameters (in bytes) to follow
Character Pitch
m=0: unchanged
m=1: Proportional
m>5: m/360 inch
Point size=(n1 + [n2 x 256]) x 0.5 point
Point size can be selected between a
minimum of 8 point to a maximum of
64 point.
Appendix D: Printer Commands
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.
Set 12 Cpi Pitch
ASCII: ESC :
Dec: 27 58
Hex: 1B 3A
Changes to 12 cpi except if Menu item
"SI Select (12 CPI)" is set to "20", then
ESC: will change 17.1 cpi to 20 cpi and
will not change 20 cpi.
Set 15 Cpi Pitch
ASCII: ESC g
Dec: 27 103
Hex: 1B 67
OKI unique command. Sets 15 cpi.
Set Compressed Pitch
ASCII: SI
Dec: 15
hex: 0F
Condenses cpi as follows (depending on
MENU setting for SI Select Pitch):
10 cpi: 15 cpi for SI=10; 17.1 cpi for SI=12
12 cpi: 12 cpi for SI=10; 20 cpi for SI=12
15 cpi: 15 cpi for SI=10; 17.1 cpi for SI=12
17.1 cpi: 15 cpi for SI=10; 17.1 cpi for
SI=12
20 cpi: 15 cpi for SI=10;17.1 cpi or 20 cpi
for SI=12
Set 20 Cpi Pitch
ASCII: ESC SI
Dec: 27 15
Hex: 1B 0F
OKI unique command.
Select pitch printer mode, ASCII: ESC I n
Dec: 27 73 n
and ROM versus RAM
Hex: 1B 49 n
character generator.
ML790/791 Printer Handbook
Selects character font according to the
value of n:
n=0: 10 cpi, utility (UTL), ROM
n=2: 10 cpi, letter quality (LQ), ROM
n=3: Proportional, LQ, ROM
n=8: 12 cpi, UTL, ROM
n=10: 12 cpi, LQ, ROM
n=12: 12 cpi, LQ, ROM
n=16: 17 cpi, UTL, ROM
n=18: 17 cpi, LQ, ROM
111
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.
n=0 to 255
n=odd: start underlining
n=even: stop underlining
Select Score
ASCII: ESC [ - Ln Hn P1 P2
16-digit: 1B 5B 2D Ln Hn P1 P2
10-digit: 27 91 45 Ln Hn P1 P2
Selects the score type and its line type.
Ln Hn: indicates the byte number (=
Ln+Hn x 256) of the parameter located
after Ln Hn.
P1: selects the score type.
P1 value specified Score type to be
(Hex)
specified.
01
selects the underscore.
02
selects the strikethrough.
03
selects the overscore.
P2: selects the line type for score line
specified.
P2 value specified Score type to be
(Hex)
specified.
00
selects none.
01
selects the single line.
02
selects the double-line.
03-FEH
selects the single line.
FFH
does not print the score
line regardless of the P1
value.
Start Subscript/
Superscript
ASCII: ESC S n
Dec: 27 83 n
Hex: 1B 53 n
Stop Subscript/
Superscript
ASCII: ESC T
Dec: 27 84
Hex: 1B 54
Engages subscript or superscript printing.
n=0 to 255
n=odd: start subscript
n=even: start superscript
Cancels subscript or superscript printing
Appendix D: Printer Commands
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.
Start Enhanxed (Double
strike) Printing
ASCII: ESC G
Dec: 27 71
Hex: 1B 47
Prints vertically shifted double dots in
two unidirectional passes.
Stop Enhanced Printing
ASCII: ESC H
Dec: 27 72
Hex: 1B 48
Cancels enhanced printing.
Double Width
(Expanded) Printing
ASCII: ESC W n
Dec: 27 87 n
Hex: 1B 57 n
n=odd: start double width printing
n=even: stop double width printing
Immediate Double Width ASCII: SO
Dec: 14
Hex: 0E
Prints double width only to end of line;
can be canceled by DC4 or ESC W 0
command.
Stop Immediate Double
Width Printing
ASCII: DC4
Dec: 20
Hex: 14
Cancels double width set by SO command.
Control Double Height/
Width
ASCII: ESC [ @ l m n1 n2 n3 n4
Dec: 27 91 64 l m n1 n2 n3 n4
Hex: 1B 5B 40 l m n1 n2 n3 n4
Sets double height, double width, or
both double height and double width
l=0 to 255
m=0 to 255
n1, n2 ignored
n3: specifies character height and line
feed
n3=17: single line feed, standard height
n3=34: double line feed, double height
n4: specfied character width
n4=1: standard width
n4=2: double width
Command will be ignored when printing bit image graphics.
ML790/791 Printer Handbook
113
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.
Maximum data per line: ML390 Turbo=480: ML391 Turbo=816
l,h=0 to 255: specifies amount of subsequent Bit Image bytes received, calculated as l + (h x 256).
Double Density Graphics
ASCII: ESC L l h [graphics data]
Dec: 27 76 l h [graphics data]
Hex: 1B 4C l h [graphics data]
Dot density 120 dpi horizontal, 72 dpi
vertical.
Maximum data per line: ML390 Turbo=960: ML391 Turbo=1632
l, h=0 to 255: specifies amount of subsequent Bit Image bytes received,
calculated as l + (h x256).
Quasi-Double Density
Graphics
ASCII: ESC Y l h [graphics data]
Dec: 27 89 l h [graphics data]
Hex: 1B 59 l h [graphics data]
Same as low speed double density (120
dpi), but printer can’t put two adjacent
dots in the same row.
Quadruple Density
Graphics
ASCII: ESC Z l h [graphics data]
Dec: 27 90 l h [graphics data]
Hex: 1B 5A l h [graphics data]
Dot density 240 dpi horizontal, 72 dpi
vertical. Printer can’t put two adjacent
dots in the same row.
Maximum data per line: ML390 Turbo=1920: ML391 Turbo=3264
l,h=0 to 255: specifies amount of subsequent Bit Image bytes received,
calculated as l + (h x 256).
Set Aspect Ratio for Bit
Image Graphics
ASCII: ESC n n
Dec: 27 110 n
Hex: 1B 6E n
In PPR emulation, sets ratio of vertical to
horizontal dot density in bit image
graphics. Valid only for ESC K, ESC L,
Graphics, 8-Pin Mode
For all 8-pin graphics
commands the number of
dot columns of graphic
data=n1 + (n2 x 256)
114
Appendix D: Printer Commands
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.
Hex: 1B 2A m l h [graphics data]
m=0: Single density, 8-pin, 60 dpi
m=1: Double density, 8-pin, 120 dpi
m=2: Double speed, double density, 8pin, quasi-120 dpi (dots can not be printed directly adjacent to one another)
m=3: Quadruple density, 8-pin, quasi240 dpi (dots can not be printed directly
adjacent to one another)
m=4: CRT I, 8-pin, 80 dpi
m=6: CRT II, 8-pin, 90 dpi
m=32: Single density, 24-pin, 60 dpi
m=33: Double density, 24-pin, 120 dpi
m=38: CRT III, 24-pin, 90 dpi
m=39: Triple density, 24-pin, 180 dpi
m=40: Hex-density, 24-pin, quasi-360
dpi (dots can not be printed directly adjacent to one another).
l, h=0 to 255: specifies amount of subsequent Bit Image bytes received,
calculated as l + (h x 256)
Graphics Select
ASCII: ESC [ g l h m [graphics data] Selects graphics and prints
Dec: 27 91 103 l h m [graphics data] m=0: Single density, 8-pin, 60 dpi
Hex: 1B 5B 67 l h m [graphics data] [same as ESC * () ]
m=1: Double density, 8-pin, 120 dpi
[same as ESC * 1]
m=2: Double speed, double density, 8pin, quasi-120 dpi [same as ESC * 2]
m=3: Quadruple density, 8-pin, quasi240 dpi [same as ESC * 3]
m=8: Single density, 24-pin, 60 dpi
[same as ESC * 32]
ML790/791 Printer Handbook
115
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. Switches printer
emulation mode, copying the custom
character data in buffer and saving the
print and receive buffers. MENU settings unaffected.
n=0: IBM emulation (general)
n=2: IBM X24e PPR, XL24e PPR
n=3: IBM X24e AGM, XL24e AGM
n=64: Epson emulation (general)
n=66: Epson LQ 850, LQ 1050
Cancel
ASCII: CAN
Dec: 24
Hex: 18
Clears buffer and cancels single doublewidth set by SO or ESC SO command;
does not affect custom characters or
other commands.
Appendix D: Printer Commands
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."
n=36: Model ML390 Turbo (narrow carriage)
n=35: Model ML391 Turbo (wide carriage)
Print Suppress Mode Off
ASCII: DC1
Dec: 17
Hex: 11
Stop Printing
ASCII: ESC j
Dec: 27 106
Hex: 1B 6A
Disable Paper-Out
Sensor
ASCII: ESC 8
Dec: 27 56
Hex: 1B 38
Enable Paper-Out Sensor
ASCII: ESC 9
Dec: 27 57
Hex: 1B 39
Software I-Prime
ASCII: ESC } NUL
Dec: 27 125 0
Hex: 1B 7D 00
Set/ Reset Incremental
Print Mode
ASCII: ESC i n
Dec: 27 105 n
Hex: 1B 69 n
ML790/791 Printer Handbook
Cancels Print Suppress Mode. Printer
becomes active, processes all data received.
Deselects the printer. Press SELECT to
reactivate. No data is lost.
Paper-out sensor is deactivated:
printer will print to next top of form before registering paper end error.
This command will be ignored if the Paper Out Override in MENU is set to No
(the factory default).
Sensor detects when less than 1/2 inch
of paper is left. When PAPER OUT light
is on, pressing SELECT prints 1 line of
data at a time until top of form position
on next page is reached. Sensor can also
be controlled by the MENU.
OKI unique command. Sets the printer
to the same state as if it had been shut off
and turned back on (print buffer cleared,
receive buffer unaffected).
Sets the Incremental print mode
n=0: Reset Incremental print mode
n=1: Set Incremental print mode
117
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.
Pin Assignments for Parallel Interface Signals
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19-30
31
32
33
34
35
36
Signal
Strobe
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Acknowledge
Busy
Paper End
Select
Auto Feed
Not used
0V
Chassis Ground
+5V *
0V
Input Prime
Fault
0V
Not used
Not used
Select In
Return Pin
Direction
19
20
21
22
23
24
25
26
27
28
29
30
No Return
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
To Printer
From Printer
From Printer
From Printer
From Printer
To Printer
No Return
No Return
Signal Ground
Frame Ground
From Printer
Ground
To Printer
From Printer
Signal Ground
High Level
To Printer
* 1.2 mA maximum
ML790/791 Printer Handbook
125
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. Connector pin arrangement
126
2
1
3
4
Appendix F: Interfacing
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:.
– insert tip of flat-blade screwdriver at
top and twist it to snap plastic molding holding cover in place.
– repeat procedure for molding at bottom of cover
– press inward on cover with your fingers and bend it back and forth until
it snaps off.
2. Holding board by cable connector, with
components facing away from parallel
interface, gently slide it into opening
against guides at top and bottom. Press
firmly into place.
127
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. You can switch to the parallel interface without removing the serial board, but
only one cable can be attached at a time.
When the serial interface is installed, the
“Serial I/F” portion of the Menu will become active (see page 73).
128
Appendix F: Interfacing
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
Oki Data Corporation
4-11-22 Shibaura,
Minato-ku, Tokyo,
108-8551, Japan
Tel : (81) 3 5445 6158
Fax : (81) 3 5445 6189
www.okidata.co.jp
Oki Data (Singapore)
Pte Ltd.
78 Shenton Way, #09-01,
Singapore 079120
Tel : (65) 6221 3722
Fax : (65) 6421 1688
www.okidata.com.sg
Oki Systems (Thailand)
Ltd.
956 Udomvidhya Building, Tel : (662) 636 2535
6th Floor, Rama IV Rd.,
Fax : (662) 636 2536
Bangkok 10500, Thailand www.okisysthai.com
Oki Hong Kong Limited Suite 1909, Tower 3,
China Hong Kong City,
33 Canton Rd.,
Tsimshatsui, Kowloon,
Hong Kong
Tel : (852) 2736 0130
Fax : (852) 2376 3725
The IPL Group
Tel : (02) 9690 8200
Fax : (02) 9690 8300
www.oki.com.au
63-85 Victoria Street
Beaconsfield NSW 2015,
Australia
Comworth Systems Ltd. 10 Constellation Drive
Mairangi Bay, Auckland,
New Zealand
Tel : (09) 477 0500
Fax : (09) 477 0549
www.comworth.co.nz
Oki Data Corporation
4-11-22, Shibaura, Minato-ku
Tokyo 108-8551 Japan
Tel: (81) 3 5445 6158
Fax: (81) 3 5445 6189
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