Star Micronics NX-1020 User Manual

NX-1020

RAINBOW

USERS MANUAL

NOT INTENDED FOR SALE

Federal Communications Commission

Radio Frequency Interference Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and at, the user is encouraged to try to correct the
interference by one or more of the following measures:

l Reorient or relocate the receiving antenna.

* Increase the separation between the equipment and receiver.
* Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

l Consult the dealer or an experienced radioDV technician for help.

Unauthorized modifications of this product by the user will void his authority to operate the equipment
unless expressly approved by the party responsible for compliance.

For compliance with the Federal Noise Interference Standard, this equipment requires a shielded cable.

The above statement applies only to printers marketed in the V.SA.

-

The Canadian Department of Communications

Radio Interference Regulations

This digitalapparatus does not exceed theClass B limits for radionoiseemissions from digitalapparatus

set out in the Radio Interference Regulations of the Canadian Department of Communications.

Statement of

Le ptisent appareil numkique n’hen pas de bruits radioklectriques dCpassant les limites applicables
aux appareils numCriques de la classe B prescrites dans le Reglement sur le brouillage radio&cnique
Cdict6 par le miniske des Communications du Canada.

The above statement applies only IO printers marketed in Canada.

Trademark Acknowledgements

NX-1020, NX-1000, LC-10, ND-lo/H: Star Micronics Co., Ltd.
IBM PC, PC-AT, PC-XT, Proprinter III, Proprinter II, PC-DOS: International Business Machines

Corp.
Microsoft BASIC, MS-DOS: Microsoft Corporation
FX-850, EX-800, LX-854 LX-810: Seiko Epson Corp.

NOTICE

l All rights reserved. Reproduction of any part of this manual in any form whatsoever without

STAR’s express permission is forbidden.
. The contents of this manual are subject to change without notice.
. All efforts have been made to ensure the accuracy of the contents of this manual at the time of

press. However, should any errors LX detected, STAR would greatiy appreciate being informed

of them.
. The above notwithstanding, STAR can assume no responsibility for any errors in this manual.

-

0 Copyright 1990 Star Micronics Co., Ltd.

HOW TO USE THIS MANUAL

This manual is organized into nine chapters. To learn how to make the best
use of your printer you are urged to read through chapters 1 through 3. The
remaining chapters may be treated as a reference guide for programming
operations, etc. It assumes a degree of knowledge of the operation of
computers (for instance, it assumes you know about hexadecimal numbers).
The chapters are as follows:

Chapter 1 - Setting up the printer
This chapter explains how to get the printer unpacked and set up. Read this

chapter before you do anything else.

Chapter 2 - Control panel operations

There are a number of controls on the front panel which perform various
functions related to paper handling, print modes and font selection.

After getting set up, read this chapter and try out the various procedures in
it to find out how the printer works.

Chapter 3 - Default settings
This chapter explains how to use the Electronic DIP Switch (EDS) mode to

make system settings on the printer.

Chapter 4 - Printer control commands

This chapter explains the different emulations provided by your printer, and
the software commands used to drive it. This section is of use if you are
writing or modifying programs to take advantage of the printer’s features.

Chapter 5 - Download characters
This chapter explains the procedures to create your own characters.

Chapter 6 - MS-DOS and your printer
Since the PC or PC-AT family of computers running under MS-DOS is

currently the most popular configuration of microcomputer, we have in­cluded a few hints and tips to help you use your printer with such systems.
Since virtually all PCs are sold with a Microsoft BASIC interpreter, we have
also included some hints, and a sample program in this language to

demonstrate the capabilities of the printer.

Chapter 7 - Troubleshooting and maintenance
This section gives a checklist of points to check if your printer is not working

in the expected way. It also includes details of some routine maintenance
operations you can carry out yourself. It is not, however, a complete service
manual. Call a qualified service engineer if you are unsure of your ability to
carry out any maintenance or servicing operations.

Chapter 8 - Specifications

This section gives the specifications of your printer.

Chapter 9 - Character sets
These charts show the different character sets available.

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FEATURES OF THE PRINTER

This printer has a full complement of features, making it an excellent partner
for a personal computer. It supports the IBM/Epson printer commands and
character sets, enabling it to print just about anything your computer can
generate, both text and graphics. Some of its main features are the following:

l Extensive software support

Since it is compatible with the Epson and IBM printers, it works with any
software that supports those printers. That includes most word-processing
and graphics programs, spread-sheets, and integrated software packages.

l Easy operation

Clearly understandable indicator displays and beep tones provide immedi­ate feedback when you press the buttons on the control panel. The five
buttons can operate in combinations to perform a surprising variety of
functions, including micro-alignment.

l Easy care and maintenance

The ribbon cartridge can be replaced in seconds the print head in a few

minutes.

l Versatile paper handling

Single sheets, fanfold forms, and multi-part forms (up to quadruple-ply) are
all accepted, and you can use either push/pull tractor or friction feed. A
special feature enables you to keep fanfold forms parked in readiness while
printing on other paper.

l Large variety of fonts and sizes

The printerhas one draft font, one High-Speed Draft font and four NLQ fonts
(Courier, Sanserif, Orator and Script), italics for all styles, plus condensed
print, bold print, double-sized print, and quadruple-sized print.

/

Chapter 1 SETTING UP THE PRINTER

Chapter 2 CONTROL PANEL OPERATIONS

TABLE OF CONTENTS

Locating the Printer
Unpacking and Inspection

Checking the carton contents
Identifying printer parts

Setting Up

Mounting the platen knob
Install the ribbon cartridge and the roller unit
Connecting the printer to your computer

Loading Single Sheets

Automatic loading
Manual loading

Loading and Parking Fanfold Forms

Loading the paper from the rear of the printer
Loading the paper from the bottom of the printer
Paper parking

Paper unparking
Loading Multi-Part Forms
Adjusting the Printing Gap

Buttons and Indicators

ON LINE button

PAPER FEED button

SET/EJECT/PARK button
PITCH button
FONT button

Power-Up Functions

Short test mode
Long test mode

Print area test mode

Stay in panel pitch

Stay in panel font

Stay in panel pitch and font

Hexadecimal dump

Switch Combination Functions

Form feed
Top of form

1

1
2
2
3
4
4
4
8 _
9
9

11
12
12
15
16
17
18
19

21
21
22
22
23
23
24
25
25 ­26
27
27
27
27
28
30
30
30

Forward micro-feed
Reverse micro-feed
Changing the auto loading value
Clearing the buffer/All reset

Selecting the print color
Store macro definition

31
31
31
32

32
33

Chapter 3 DEFAULT SETTINGS

How to set the EDS mode

Functions of the EDS settings

Bidirectional test/Adjustment mode

Chapter 4 PRINTER CONTROL COMMANDS

Font Control Commands
Character Set Commands
Character Size and Pitch Commands
Vertical Position Commands
Horizontal Position Commands
Graphics Commands
Download Character Commands
Color Selection Commandes
Other Printer Control Commands

Chapter 5 DOWNLOAD CHARACTERS

Designing Your Own Draft Characters

Defining the attribute data
Assigning the character data
Sample program

Defining Your Own NLQ Characters

Assigning the character data with the Standard mode
Assigning the character data with the IBM mode

Chapter 6 MS-DOS AND YOUR PRINTER

Installing Application Software with Your Printer
Embedding Printer Commands
Programming the Printer with DOS Commands
Programming with BASIC

How the program works

35
35

36

40
41

42

47
50
55
62
67
70
74

76

81

81
82
83
84
86
86

90

95
95
96

98
101
104

Chapter 7 TROUBLESHOOTING AND MAINTENANCE

Troubleshooting

Power supply
Printing

Paper feeding
Maintenance
Replacing the Print Head

107
107
108
108
110
113
113

Chapter 8 SPECIFICATIONS
Chapter 9 CHARACTER SETS

Standard Character Set #l
Standard Character Set #2
International Character Sets
IBM Character Set #2

Code page #437 (U.S.A.)
Code page #850 (Multi-lingual)
Code page #860 (Portuguese)
Code page #861 (Icelandic)
Code page #863 (Canadian French)

Code page #865 (Nordic)
IBM Character Set #l
IBM Special Character Set

INDEX

COMMAND SUMMARY

115

119
120
122
123
124
124
126
127
128
129
130
131
132

133

136

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Chapter 1

SETTING UP THE PRINTER

Subjects covered in Chapter 1 include -

l Locating the printer
l Unpacking and inspection (part names)
l Setting up and connecting
l Loading single sheets
l Loading and parking fanfold forms
l Adjusting the printing gap

LOCATING THE PRINTER

Before you start unpacking and setting up your printer, make sure that you
have a suitable place on which to locate it. By “a suitable place”, we mean:

l A firm, level surface which is fairly vibration-free
l Away from excessive heat (such as direct sunlight, heaters, etc)
l Away from excessive humidity
l Away from excessive dust

Supply it with “clean” electricity. Do not connect it to the same circuit as

l

a large, noise-producing appliance such as a refrigerator.

l Make sure the line voltage is the voltage specified on the printer’s

identification plate.

l To disconnect the printer the plug has to be disconnected from the wall

socket, which has to be located close to the printer, and easy to access.

l Install the printer where there is sufficient room for the paper and any

paper being fed in or printed out.
If you are connecting your printer with a parallel cable, make sure that the

l

cable is within 2m (6ft) of the printer. An RS-232 connection using the
optional SPC-8K interface can be made over longer distances.

1

UNPACKING AND INSPECTION

Checking the carton contents

Now unpack the contents of the shipping carton, and check each item in the
box against Figure l- 1 to make sure that you have everything (there should
be six items).
If any of these items are missing, contact your supplier.

-

b.

The optional accessories which you may have ordered with your printer are:

l Monochrome ribbon cartridge (ZX9)
l Serial-Parallel converter (SPC-8K)
l Automatic sheet feeder (SF- IODN)
l Roll paper holder (RH-IOZ)

Identifying printer parts

Make an external inspection of the printer. Note the locations of the
following parts in Figure l-2.

FIgwe 7-Z. The printer’s external parts

Roller unit:
Release lever:

holds the paper against the platen.
releases the platen. This lever must be back for
single sheets, and forward for fanfold forms.

Top cover:
Rear cover:
Entry slot:
Control panel:
Power switch:
Interface connector: for connecting the computer to the printer.

protects the print head and other internal parts.
protects the tractor feed mechanism.
for inserting single sheets of paper.
controls various printer functions.
turns power on and off.

3

SETTING UP

Place the printer in the desired location, and remove all packing material
from inside the top cover. This packing material is intended to prevent
damage to the printer while in transit. You will want to keep all the packing
material, along with the printer carton, in case you have to move the printer
to a new location.

Mounting the platen knob

The platen knob is packed into a recess of the white foam packing material
which held your printer inside the carton. Be sure to remove the knob from
the packaging.

Mount the knob on the platen shaft, which is on the right-hand side of the
printer. Rotate the knob on the shaft before pushing the knob fully into
position.

-

Piaten

knob

Figure T-3. Mounting the platen knob

Install the ribbon cartridge and the roller unit

Remove the top cover by lifting up the front (using the two grips on either

side), and pulling the cover towards you (see Figure l-4). Now install the
ribbon. (If you want to print with black only, install the monochrome ribbon
cartridge, ZX9.)

4

F/gum T-4. Removing the top cover

1. Turn the tension knob counterclockwise on the ribbon cartridge to
tighten the ribbon if it is slack.

Guide the ribbon between the print head and the silver print head shield,

2.
making certain that the spindles on the cartridge holder fit into the
sockets on the cartridge itself.

int head shield

F/gum 1-5. Installing the ribbon cartridge

3. The ribbon should pass between the print head and the print head shield
(see Figure l-6).

rint head shield

Figum 7-6. Pass the ribbon between the print head and print head shield

4. After you have installed the ribbon cartridge, install the roller unit.

5. Open the rear cover using the two grips on either side.

6. Gripping the lock levers on both sides of the roller unit, fit the mounting

brackets onto the shaft inside of the printer mechanism. You will need
to tilt the roller unit slightly backward.

7. Secure the roller unit firmly by lowering into position, as shown in
Figure l-7.

8. Close the rear cover.

-

-

6

Figure T-7. Install the roller unit onto the printer

To replace the top cover, insert the tabs into the slots on the printer case.

Swing the front edge down to close the cover.

Leave the top cover closed during normal operation. The cover keeps out

dust and dirt and reduces the printer’s operating sounds. Open the cover only

to change the ribbon or make an adjustment.
NOTE : When you remove the color ribbon cartridge, press the ribbon

release catch toward you with your index finger. Once the ribbon is
free of the print head, the cartridge lifts out easily.

Connecting the printer to your computer

Connect the printer to your computer using a standard parallel interface
cable. On a PC or PC/AT-type computer, this means that you use the 25pin
D-type connector at the computer end, and the Amphenol-type 36-pin con-

nector at the printer end. The configuration of the printer’s connector is

given in Chapter 8 should you need a cable for connecting to another
computer.

If you need to connect to a serial port, use the optional Serial-Parallel con-

verter, SPC-8K.

\ -i

\

\Y

Connector

%

Inierface cable

Figurn 7-S. Connecting the interface cable

Plug the printer into a suitable outlet. However, DO NOT turn on the power
switch at the front of the printer yet.

NOTE: To disconnect the printer the plug has to be disconnected from the

wall socket, which has to be located close to the printer, and easy to

access.

8

LOADING SINGLE SHEETS

This section will take you through the procedures for loading single sheets
of paper.

If you are using the optional automatic sheet feeder (SF- lODN), refer to the
ASF instruction booklet.

Automatic loading

Single sheets can be loaded manually with the power off, or automatically
with the power on. We will start the easy way with automatic loading.

1. Place the paper guide in position by inserting the tabs, located on the
bottom of the assembly, into the slots on the rear cover of the printer.

Figure 1-9. Mounting the paper guide for single sheets

2. Adjust the paper guides to match the size of the paper you will be using.
Remember that printing will start some distance from the left-hand edge
of the carria.ge.

3. Turn on the power using the switch located at the front of the printer. The
printer will beep, indicating that there is no paper in position for printing.

The orange POWER indicator will also flash to confirm this.

9

4. Make sure that the release lever is back.
If fanfold paper is already mounted in the printer, press the (

SE~&~cT
button to park the paper in the off-line state, then move the release lever
backwards.

5. Place a single sheet between the guides, placing the side on which you
want to print towards the back of the printer. Gently push the paper down
in the guides until you feel it stop.

6. Now press the (

SETpE&C’

) button. The paper will be fed into the printer

and adjusted past the print head to a position ready for printing.

7. If you want to set the paper to a different position, set the printer off-line
by pressing the ( ON LINE

) button, then set the paper by using the

micro-feed function. (For details, refer to Chapter 2.)

lease

lever

1

-

-

I

Figure 1-10. Loading a single sheet

Manual loading

It is also possible to load paper manually while the printer’s power is off. The
procedure is:

Place the paper guide in position by inserting the tabs, located on the

1.
bottom of the assembly, into the slots on the rear cover of the printer.

Check that printer power is off and the release lever is back.

2.
Adjust the paper guides to match the size of paper you will be using.

3.
Remember that printing will start some distance from the left-hand edge
of the carriage.
Place a single sheet between the guides, placing the side on which you

4.
want to print towards the back of the printer. Gently push the paper down
in the guides until you feel it stop.
Turn the platen knob clockwise until the front edge of the paper comes

5.
out from under the top cover.
If the paper is not straight, move the release lever forward, then

6.
straighten the paper by hand and move the release lever back.

11

I

I

/

LOADING AND PARKING FANFOLD FORMS

Fanfold forms have holes along the sides and perforations between the
sheets. They are also called sprocket forms, punched forms, or just plain
“computer paper”. This printer accepts forms up to 10” wide. This section
will take you through the procedures for loading, parking and unparking
fanfold forms.

Loading the paper from the rear of the printer

You can load the fanfold paper either from the rear or from the bottom of the

printer. If you are going to load the paper from the bottom, refer to the next

section.

1. Place a stack of fanfold paper behind and at least one page-length below
the printer.

2. Turn the printer’s power OFF.

3. Push the release lever forward. This has the effect of releasing the paper
from the platen roller, and engaging the tractor feed.

4. Remove the paper guide and put it aside for the moment.

5. Remove the rear cover using the two grips on either side, and push back­wards as in Figure l-11.

-

1-77. nemovmg

me rear cover

6. Move the tractor units downwards by gripping the positioning levers on
both side of the tractor unit as shown in Figure 1-12.

Tractor cover

Figure 1-72. Move the tractor units downwards for loading the paper from the rear

mp lever

7. With the tractor covers open, mount the paper by aligning holes with the
pins on the tractor unit.

Tractor cover

p lever

figure l-73. Mount the fanfold paper over the tractor units

13

8. Adjust the spacing of the tractor units by sliding them along the bar, using
the clamp lever at the back of each unit to release and lock them in

position. When the clamp lever is up, the unit is released, and when it is

down, the unit is locked.

9. Now close the tractor covers, again making sure that the paper holes are
aligned with the pins on the tractor units. If they are not aligned properly,
you will have problems with paper feeding, possibly resulting in tearing
and jamming of the paper.

10. Turn on the power using the switch located at the front of the printer. The
printer will beep, indicating that the paper is not yet fully loaded. The
orange POWER indicator will also flash to confirm this.

11. Now press the ( VCC=,W~ ) button. The paper will be fed and adjusted
past the print head to a position ready for printing.

12. If you want to set the paper to a different position, set the printer off-line
by pressing the (

ON LINE

) button, then set the paper by using the

micro-feed function. (For details, refer to Chapter 2.)

13. Replace the rear cover, and mount the paper guide in the horizontal
position shown in Figure 1-14, so that it will separate the printed from
the unprinted paper.

Figure i-14. Mounting the paper guide for fanfold forms

Loading the paper from the bottom of the printer

You can load the fanfold paper from the bottom of the printer with the
following procedure.

1.

Remove the top cover and the roller unit.

2.

Open the rear cover using the two grips at the side, and push backwards.

3.

Grip the positioning levers on both side of the tractor unit, and pull the

unit upwards as shown in Figure 1-15.

Positioning lever

Positioning lever

Figure 7-75. Pull up the tractor unit for bottom feeding

.-

4.

Place a stack of fanfold paper below the printer.

5.

With the tractor covers open, mount the paper from the bottom of the
printer, by aligning holes with the pins on the tractor unit.

6.

Adjust the spacing of the tractor units by sliding them along the bar, using
the clamp lever at the back of each unit to release and lock them in

position. When the lever is up, the unit is released, and when it is down,

the unit is locked.

Figuro I-16. Mount the fanfold paper from the bottom of the printer.

7. Now close the tractor covers, again making sure that the paper holes are
aligned with the pins on the tractor units. If they are not aligned pIoperly,

you will have problems with paper feeding, possibly resulting in tearing
and jamming of the paper.

8. Remount the roller unit and replace the rear cover and the top cover.

Paper parking

After loading fanfold paper from the rear of the printer, you do not have to

unload it when you want to print on a single sheet. The printer will “park”

it for you if you follow the procedure below.

1. To begin paper parking, start with power ON, fanfold paper loaded in
printing position, and the release lever forward.

2. Press the (
line. ON LINE indicator will turn off.

3. Tear off the printed form at the last perforation, leaving not more than
about half a page showing above the top cover. If necessary, press the

(PAPER FEED) button to feed paper forward until a perforation is located

just above the top cover, and tear there.

4. Press the (

The printer will automatically feed the fanfold form backward until the
paper is completely free of the platen.

ON LINE Ibutton on the control panel to set the printer off-

sEsdscT

1 button on the control panel.

-

16

5. Move the release lever to the back.

6. Mount the paper guide in the upright position.

Now you can load single sheets either automatically or manually, as
explained previously. The fanfold paper remains parked at the back of the
printer.

NOTE:You cannot park the fanfold paper if you have loaded it from the

bottom of the printer.

Paper unparking

When you want to resume using fanfold paper, the procedure is as follows.

1. Remove all single sheets from the printer.

2. Mount the paper guide in the horizontal position.

3. Move the release lever to the front.

4. Press the C TFAF > button. The printer will automatically feed the
parked fanfold paper back into position for printing.

NOTE: The printer beeps intermittently if you move the release lever while

the paper is loaded.

17

LOADING MULTI-PART FORMS

You can print on continuous multi-part forms with the built-in tractor unit.
You can use multi-part forms that have up to four parts including the original
when the Multi-part mode is selected with the EDS setting. (For details,
please refer to Chapter 3.)

It is recommended to use forms jointed by dotted or pasting under the normal

office condition.
Multi-part forms should be pressure sensitive, and should not be used in the

friction feed. (Bottom feed with the pull-tractor is recommended.)

NOTE: When printing continuous multi-part forms, care should be taken,

as the edges of the paper might be damaged.
The tolerance between the dotted or pasted position and other
positions must be less than 0.05 mm.

-

18

ADJUSTING THE PRINTING GAP

The distance between the print head and the platen can be adjusted to
accommodate different paper thicknesses. To make this adjustment, remove

the top cover. The adjustment lever is located at the left side of the printer
mechanism. Pushing the adjustment lever backwards narrows the gap;
pulling it forwards widens the gap.

There are five positions, and you can feel the lever clicking into each
position. The second position from the rear is the one most commonly used
for single sheets of paper. Try different positions until you get the best
printing results. (Do not set the lever out of the marked positions.)

I

Figure 7-77. Location of the adjustment lever

The following table provides the recommended lever positions for each
paper types as a reference.

Paper Type

Single

2-PlY

3-PlY

4-PlY

Weight (g/ml) Thickness (mm)

(Each paper) (Total)

52-82
83 - 90

I

40-58

40-58

40-58

0.07 - 0.10

0.11 - 0.12

I

0.12 - 0.16 3rd

0.18 - 0.20

0.21 - 0.25

0.24 - 0.26

0.27 - 0.30

Recommended

Lever position

I

2nd

3rd

3rd
4th
4th
5th

NOTE: Pressure sensitive paper is recommended for the multi-part paper.

Multi-part mode is recommended when using the 4-ply paper.

(Refer to Chapter 3.)

Chapter 2

CONTROL PANEL OPERATIONS

The control panel buttons can be pressed individually to perform the opera-

tions indicated by their names. Other functions can be achieved by holding
these buttons down when you turn the printer’s power on, or by pressing the
control panel buttons in combination.

This chapter explains all the button and indicator functions.

l Pause printing
l Feed paper (fast and slow, forward and reverse)
l Park fanfold forms
l Set the top-of-form position

9 Select the print pitch

l Select a font
l Print test patterns
l Prevent software from changing the panel pitch and font selections

l Print a hexadecimal dump

9 Clear the printer’s buffer

l Change the print color
l Store macro definition

BUTTONS AND INDICATORS

The printer is equipped with five buttons on the control panel. From left to
right they are,(‘) and (PITCH) (smaller buttons), and C ),

(PAPER FEED), and ( ON LINE )(larger buttons).

The following is a brief guide to the buttons and indicators on the control
panel.

Figure 2-T. Control panel

sE~~~~Cr

21

ON LINE button

The ( ON LINE ) button sets the printer on-line and off-line. The status
changes each time you press the button.

When the printer is on-line, it can receive and print data from the computer.
When the printer is off-line, it stops printing and sends the computer a signal
indicating that it cannot accept data.

The printer powers up in the on-line status if paper is loaded. If paper is not
loaded, the printer powers up off-line with the POWER indicator flashing.
When you load paper, the POWER indicator stops flashing, and the printer
goes on-line.

You will want to press the (

l Before and after any other panel operation

ON LINE

) button:

The other panel buttons operate only in the off-line state. Press the
( ON LINE ) button to go off-line. After performing the panel
operation(s), press the C ON LINE

l To pause during printing

If you press the ( ON LINE

) button again to go back on-line.

> button during printing, the printer stops
printing and goes off-line, allowing you to check the printout or change
a control panel setting. Printing resumes when you press the C

ON LINE )

button again to go back on-line.

l To cut fanfold forms at the end of printing

When using fanfold forms, you can hold the (

ON LINE ) button down

for one second. In addition to going off-line, the printer also feeds the
paper forward approximately two inches. This allows you to cut it off just
below the last line printed.
When you press the C ON LINE

) button again to go back on-line, the

paper feeds backward stopping where you left off.

NOTEShis function is valid only when the buffer is empty.

PAPER FEED button

-

If you press this button while off-line, the paper will feed forward. If you
hold the button down, the printer will perform consecutive line feeds.

22