Denso QS20H User Manual

2D Code Scanner

QS20H

User's Manual

Copyright © DENSO, 1999

All rights reserved. No part of this publication may be reproduced in any form or
by any means without permission in writing from the publisher.

Specifications are subject to change without prior notice.

All products and company names mentioned are trademarks or registered trade­marks of their respective holders.

i

Preface

Please READ through these operating instructions carefully. It will enable you to
operate your QS20H correctly.

After you have finished reading the instructions, keep this manual handy for
speedy reference.

ii

Meaning of Symbols

A triangle ( ) with a picture inside alerts you to a warning of danger.
Here you see the warning for electrical shock.

A diagonal line through a circle ( ) alerts you to something you
should not do; it may or may not have a picture inside. Here you see a
screwdriver inside the circle, meaning that you should not disassemble.

A black circle (

) with a picture inside alerts you to something you

MUST do. This example shows that you MUST unplug the power cord.

SAFETY PRECAUTIONS

Be sure to observe all these safety precautions.

■ Please READ through this manual carefully. It will enable you to use the

QS20H correctly.

■ Always keep this manual nearby for speedy reference.

Strict observance of these warning and caution indications are a MUST for
preventing accidents which could result in bodily injury and substantial property
damage. Make sure you fully understand all definitions of these terms and
related symbols given below, before you proceed to the text itself.

WARNING

Alerts you to those conditions which could cause
serious bodily injury or death if the instructions
are not followed correctly.

CAUTION

Alerts you to those conditions which could cause
minor bodily injury or substantial property dam­age if the instructions are not followed correctly.

iii

WARNING

IMPORTANT: To system engineers

• When designing systems such as medicine management system
that could affect people's lives, take potential dangers into serious
consideration and make redundancy systems and safety engineer­ing which render those dangers even if data is entered incorrectly.

• If smoke, abnormal odors or noises come from the QS20H, imme­diately turn off the power, unplug the AC adapter from the wall
socket, and contact your nearest dealer.

Failure to do so could cause fire or electrical shock.

• If foreign material or water gets into the QS20H, immediately turn
off the power, unplug the AC adapter from the wall socket, and
contact your nearest dealer.

Failure to do so could cause fire or electrical shock.

• If you drop the QS20H so as to damage its housing, immediately
turn off the power, unplug the AC adapter from the wall socket,
and contact your nearest dealer.

Failure to do so could cause fire or electrical shock.

• Never bring any metals into contact with the output terminals.

Doing so could produce a large current through the QS20H, result­ing in heat or fire, as well as damage to the QS20H.

• Keep the QS20H away from water or moisture.

Getting the QS20H wet could result in a fire or electrical shock.

• Use the furnished AC adapter only. Failure to do so could result in
fire.

• Never use the QS20H on the line voltage other than the specified
level. Doing so could cause the QS20H to break or burn.

• Do not use the QS20H where any inflammable gases may be
emitted; doing so could cause fire.

iv

WARNING

• Do not scratch, modify, bend, twist, pull, or heat the power cable of
the AC adapter. Do not place heavy material on the cable or allow
the cable to get pressed under heavy material.

Doing so could break the cable, resulting in a fire.

• If the power cable of the AC adapter is damaged (e.g., exposed or
broken lead wires), stop using it and contact your nearest dealer.

Failure to do so could result in a fire or electrical shock.

• Do not subject the scanning window of the QS20H to direct sun­light for extended periods.

Doing so could damage the QS20H, resulting in a fire.

Never

disassemble

CAUTION

• Do not put the QS20H on an unstable or inclined plane.

It may drop, creating injuries.

• Never put the QS20H in places where there are excessively high
temperatures, such as inside closed-up automobiles, or in places
exposed to direct sunlight.

Doing so could affect the housing or parts, resulting in a fire.

• Avoid using the QS20H in extremely humid or dusty areas, or
where there are drastic temperature changes.

Moisture or dust will get into the QS20H, resulting in malfunction,
fire or electrical shock.

• Do not place the QS20H anyplace where it may be subjected to oily
smoke or steam, e.g., near a cooking range or humidifier.

Doing so could result in a fire or electrical shock.

• Never disassemble or modify the QS20H; doing so could result in
an accident such as fire or electrical shock.

v

CAUTION

• If you will not be using the QS20H for a long time, be sure to
unplug the AC adapter from the wall socket for safety.

Failure to do so could result in a fire.

• Never cover or wrap up the QS20H or AC adapter in a cloth or
blanket.

Doing so could cause the unit to heat up inside, deforming its
housing, resulting in a fire.

Always use the QS20H and AC adapter in a well-ventilated area.

• Keep the power cable away from any heating equipment.

Failure to do so could melt the sheathing, resulting in a fire or
electrical shock.

• Do not insert or drop foreign materials such as metals or anything
inflammable through the openings (vents or scanning window)
into the QS20H.

Doing so could result in a fire or electrical shock.

• Do not scratch or modify the QS20H or its interface cable. Do not
bend, twist, pull, or heat the cable.

Doing so could damage the QS20H or its interface cable, creating a
fire hazard.

• Do not put heavy material on the QS20H or its interface cable, or
allow the cable to get pressed under heavy material.

• Do not look into the light source from the scanning window of the
QS20H or do not point the scanning window at other people’s
eyes.

Eyesight may be damaged by direct exposure to this light.

• Do not use the QS20H if your hands are wet or damp.

Doing so could result in an electrical shock.

vi

CAUTION

• Never use chemicals or organic solvents such as benzene and
thinner to clean the housing. Do not apply insecticide to the
QS20H.

Doing so could result in a marred or cracked housing, electrical
shock or fire.

• When disconnecting the AC adapter from the wall socket, hold the
AC adapter body not the power cable.

The power cable may be broken, resulting in a burnt AC adapter,
electrical shock, or fire.

• During electrical storm activity, always unplug the AC adapter
from the wall socket.

Exposure to power surges could result in a damaged QS20H or
fire.

• When taking care of the QS20H, unplug the AC adapter from the
wall socket for safety.

Failure to do so could result in an electrical shock.

• If the interface cable is damaged (e.g., exposed or broken lead
wires), stop using it and contact your nearest dealer.

Failure to do so could result in a fire or electrical shock.

vii

■ Proper Care of the QS20H

To clean the housing, moisten a soft cloth with neutral detergent diluted with
water and wring it out thoroughly. Wipe the QS20H with the cloth and then go
over it again with a dry cloth.

Dust or dirt accumulating on the scanning window will affect reading perfor­mance. If the scanning window is dusty, first blow the dust away with an air
brush. Then wipe the window with a cotton swab or the similar soft one gently.

viii

Content Overviews

Preface ...................................................................................................................... i

SAFETY PRECAUTIONS .......................................................................................... ii

Chapter 1. How to Use .......................................................................................... 1

Chapter 2. Connecting the QS20H to the PC ...................................................... 6

Chapter 3. Parameters and Defaults .................................................................... 7

Chapter 4. QR-coded Parameter Menu ............................................................... 9

■ Menu control............................................................................................ 10

■ Communications mode .......................................................................... 11

■ Communications conditions .................................................................. 11

■ Transmission format ............................................................................... 13

■ Reading modes ........................................................................................ 15

■ Readable bar codes ................................................................................. 17

■ Other settings .......................................................................................... 19

Chapter 5. Communications ................................................................................. 21

Appendix. Specifications....................................................................................... 27

1

Chapter 1. How to Use

■ Names and Functions

➀ Scanning window

Point this window at the QR code or bar code to be scanned. The scanning
distance from this window is 50 to 150 mm (that may vary depending upon
labels).

➁ Trigger switch

Press this switch to start reading QR codes or bar codes.

➂ Reading confirmation LED

Illuminates when the QS20H has read the code successfully.

➃ Beeper outlet

The beeper sounds when the QS20H has read the code successfully

➄ Interface connector

Via this connector, the QS20H exchanges data with the host computer.

➅ DC power jack

Connect the AC adapter to this jack. This jack is compliant with EIAJ RC5320A.
(For details about the voltage classification, contact your dealer.)

➀ Scanning window

➁ Trigger switch

➂ Reading confirmation LED

➃ Beeper outlet

➄ Interface connector

➅ DC power jack

2

■ Scanning Codes

Point the scanning window at a target code and hold it 50 to 150 mm (2.0 to 6.0
inches) away from the code. Keep the QS20H stationary in a position where the
code lies within the scanning area between the right and left pointers and where
the center pointer is on the centerline parallel to the right or left edge of the code,
and then press the trigger switch.

When the QS20H has read the code successfully, the reading confirmation LED
will illuminate in green and the beeper sounds.

• The triple pointers demarcate the

left-to-right scanning range. Those
pointers almost come onto the centerline parallel to the upper or lower
edge of the code when the scanning distance is 70 to 80 mm. If the
scanning distance is more than or less than that range, however, those
pointers will deviate from the actual centerline parallel to the upper or
lower edge of the code.

• The illumination LED will turn on when the ambient environment is dark or
the target code cannot be read easily.

• If the QS20H fails to read due to specular effects or other factors, change
the scanning angle of the scanning window or the distance from codes,
and try it again. (Specular effects occur when the reflection of the light
from the label surface becomes excessively strong. This can easily happen
when the reflecting surface is polished or covered with vinyl.)

• Allow only a single code to come within the scanning range. If two or more
codes lie within the scanning range at the same time, the QS20H may fail
to read or continue reading those codes alternately.

50 to 150 mm
(2.0 to 6.0 inches)

Triple
pointers

Trigger
switch

Reading confirmation
LED (Illuminates in
green when the QS20H
has read the code
successfully.)

3

• The QS20H cannot support touch scanning. If you bring the scanning
window into contact with a target code, the QS20H cannot read it.

• The QS20H can read 2D codes omnidirectionally. Note that the target code
including the margin should lie within the scanning range.

• The time required to read a 2D code is proportional to the volume of data
contained in the code. If you scan a 2D code containing a large volume of
data with the QS20H, it may take time.

• Disabling reading of unnecessary types of codes may increase the scan­ning speed.

• Low-quality bar codes (blurred or printed too lightly) may not be read by
the QS20H even if they are the type that barcode-dedicated scanners can
read.

Before reading labels, clean them if stained.

Avoid using the QS20H in direct sunlight. The QS20H might fail to read
correctly.

Depending upon the cell pitch or code size, the proper scanning distance
from labels will differ.

NOTE

NOTE

NOTE

4

■ Features

Trigger switch control

If you press the trigger switch, the QS20H will become ready to scan. Bringing
the scanning window to a 2D code or bar code will cause QS20H to read the code
and send it to the connected PC or external equipment automatically. The
trigger switch is available in four modes—Auto-off mode, Momentary switching
mode, Alternate switching mode, and Continuous reading mode. You may
switch between those modes from the QR-coded parameter menu given in
Chapter 4.

(1) Auto-off mode

Holding down the trigger switch lights the illumination LED for a maximum of 5
seconds during which the QS20H is ready to scan. If you release the trigger
switch or when the QS20H completes code reading, the illumination LED goes
off.

(2) Momentary switching mode

Only while you hold down the trigger switch, the illumination LED lights and the
QS20H can read a code.

(3) Alternate switching mode

Pressing the trigger switch turns on the illumination LED. Even if the switch is
released, the illumination LED remains on until a code is read successfully or you
press the trigger switch again. Pressing the trigger switch toggles the illumina­tion LED on and off.

(4) Continuous reading mode

Powering on the QS20H turns on the illumination LED and keeps it on, irrespec­tive of the trigger switch.

Re-read prevention

The QS20H supports the re-read prevention so that it will not read same codes in
succession. If the QS20H fails to read, therefore, you need to release the trigger
switch or pull the scanning window away from the target code for at least one
second for canceling the re-read prevention and then try scanning again.

For low-quality labels which cannot be read for more than one second, the
QS20H might read same codes in succession at intervals of more than one
second.

5

Reading black-and-white inverted QR codes

The QS20H can read white QR codes on black background. You may switch
between "Black code on white background" and "White code on black back­ground" by using the QR-coded parameter menu given in Chapter 4.

Reading split QR codes (registered as "Structured Append" at AIM)

A QR code can be split into a maximum of 16 blocks. The QS20H can read split
QR codes. Two reading modes of split QR codes are available—Edit mode and
Non-edit mode. In the Edit mode, the QS20H edits scanned split codes and
transfers the restored data to the PC; in the Non-edit mode, each time the QS20H
reads a single split code, it transfers the data to the PC. You may switch between
those modes by using the QR-coded parameter menu given in Chapter 4.

Up to 8 kilobytes of data transferable in Edit mode

In Edit mode, QS20H can read split codes of up to 8-kilobyte data, store and edit
them, and then transfer the restored data to the PC. If a restored code contains
data exceeding 8 kilobytes, a reading error will occur.

Supporting bar codes, QR codes, and other types of two-dimensional codes

The QS20H can read the following codes:

Bar codes: EAN, UPC-A/E, CODE39, CODE128, NW-7, and

ITF

QR codes: Model 1, Model 2, and MicroQR

Two-dimensional codes: PDF417, MaxiCode and Data Matrix

6

Chapter 2. Connecting the QS20H to the PC

■ Connection precautions

• Use a sufficient length of wiring for the interface cable or AC adapter cable.

• Do not let the interface cable or AC adapter cable run along the floor.

• Do not walk on or hook cables, as this could scratch them.

• When connecting or disconnecting the interface cable or DC power jack,
hold the connector housing and carefully plug or unplug it.

• Do not apply power exceeding 10 VDC to the DC power jack.

■ Precautions in installation

• Do not set up the QS20H in any of the following environments:

- in places exposed to direct sunlight

- near any heating equipment

- in extremely hot and humid areas

- in extremely cold areas such as in refrigerators

Under the above environmental conditions, the code scanner circuitry or
optical components might not operate normally.

• Do not set up the QS20H anyplace where it may be exposed to water.

Water will get into the QS20H, damaging the scanner.

• Do not set up the QS20H in the vicinity of machinery that could generate
high frequencies.

High frequencies may cause the QS20H to malfunction.

• Do not set up the QS20H in places where it may be subjected to excessive
dust or conductive dust (e.g., carbons or metallic powders).

Electrical insulation failures may occur, resulting in a broken scanner.

• Take care not to drop the QS20H during installation work.

Dropping or bumping the QS20H against a solid object may result in a
broken housing or internal failure.

• Do not set up the QS20H in places where it may be subject to vibration,
e.g., on machinery or belt conveyers.

Vibration may cause the QS20H to break.

7

Chapter 3. Parameters and Defaults

The table below lists the parameters and their default values. Note that the
defaults given below are values preset when the QS20H leaves the factory.
Some of the communications parameters and readable bar code settings may
have been modified by dealers according to your needs.

You may change parameters given in the table below by using the QR-coded
parameter menu given in Chapter 4. Settings made from the QR-coded param­eter menu will be stored in the memory of the QS20H.

Parameter group Parameters Function Factory defaults

Communications Procedure Non-acknowledge mode √
mode

ACK/NAK mode

Communications Transmission rate 4800 bps
conditions

9600 bps
19200 bps
38400 bps √
57600 bps
115200 bps

Character length 8 bits √

7 bits

Parity check No √

Even parity
Odd parity

Stop bit length 1 bit √

2 bits

Transmission Header None √
format

STX

Terminator ETX

CR √
LF
CR LF

Transmission of code Disabled √
ID mark (see p. 21)

Enabled

Transmission of no. Disabled √
of digits

Enabled

BCC Disabled √

Enabled

8

Parameter group Parameters Function Factory defaults

Reading modes Reading MicroQR Disabled √

Enabled

Reading black-and-white Black code on white
inverted QR codes background √

White code on black
background

Edit/Non-edit mode for Edit mode √
split QR codes (“Structured

Non-edit mode

Append”)

Reading PDF417 Disabled √

Enabled

Reading MaxiCode Disabled √

Enabled

Reading Data Matrix Disabled √

Enabled

Readable bar UPC-A/E and EAN-13/8 Disabled
codes

Enabled √

Interleaved 2 of 5 Disabled

Enabled without check digits √
Enabled with check digits

CODE128 Disabled

Enabled √

CODABAR (NW-7) Disabled

Enabled without check digits √
Enabled with check digits

Transmission of starter/ Disabled
stop codes for CODABAR

Enabled √

(NW-7)

CODE39 Disabled

Enabled without check digits √
Enabled with check digits

Other settings Trigger switch control Auto-off mode √

Momentary switching mode
Alternate switching mode
Continuous reading mode

Beeper control Disabled

Enabled √

Reading confirmation LED Disabled

Enabled √

Power saving mode Ordinary mode √

Power saving mode for standby

9

Chapter 4. QR-coded Parameter Menu

The QR-coded parameter menu allows you to change a variety of functions built
in the QS20H according to the procedure below.

Parameter change procedure

(1) Make the QS20H ready for scan.

(2) Scan the "Start setting" code in the menu control shown on the next page.

NOTE: If the "White code on black background" reading is set in the QS20H,
scan the black-and-white inverted "Start setting" code.

(3) Scan a QR code(s) of the parameter(s) you want to set.

(4) Scan the "End setting" code in the menu control.

This stores new settings in the memory and completes the parameter
change procedure. The QS20H will become ready to scan. If you turn off
the power, those new settings will be retained.

NOTE: If you turn off the power without scanning the "End setting" code,
new settings you made will be canceled.

To restore factory defaults, scan the "Defaults" code in the menu control.

To cancel the parameter change procedure, scan the "Cancel" code.

10

"Start setting" (When the "White

code on black
background" is set)

"End setting"

"Cancel"

"Defaults"

■ Menu control

11

■ Communications mode

Procedure

■ Communications conditions

Transmission rate

"Non-acknowledge
mode" (default)

"ACK/NAK mode"

"4800 bps" "9600 bps"

"19200 bps" "38400 bps"

(default)

"57600 bps" "115200 bps"

12

Parity check

"No" (default)

"Even parity" "Odd parity"

Stop bit length

"1 bit" (default) "2 bits"

Character length

"7 bits" "8 bits”

(default)

13

■ Transmission format

Header

"None" (default) "STX"

Terminator

"ETX" "CR" (default)

"LF" "CR LF"

14

Transmission of code ID mark

"Disabled" (default) "Enabled"

Transmission of no. of digits

"Disabled" (default) "Enabled"

BCC

"Disabled" (default) "Enabled"

15

■ Reading modes

Reading MicroQR

"Disabled" (default) "Enabled"

Reading black-and-white inverted QR codes

"Black code "White code
on white on black
background" background"
(default)

Edit/Non-edit mode for split QR codes ("Structured Append")

"Edit mode" "Non-edit mode"
(default)

16

Reading PDF417

"Disabled" (default) "Enabled"

Reading MaxCode

"Disabled" (default) "Enabled"

Reading Data Matrix

"Disabled" (default) "Enabled"

17

■ Readable bar codes

UPC-A/E and EAN-13/8

"Disabled" "Enabled"

(default)

Interleaved 2 of 5

"Disabled"

"Enabled without "Enabled with
check digits" check digits"
(default)

CODE128

"Disabled" "Enabled"

(default)

18

Transmission of start/stop codes for CODABAR (NW-7)

"Disabled" "Enabled"

(default)

CODABAR (NW-7)

"Disabled"

"Enabled without "Enabled with
check digits" check digits"
(default)

19

CODE39

"Disabled"

"Enabled without "Enabled with
check digits" check digits"
(default)

■ Other settings

Trigger switch control

"Auto-off mode" "Alternate
(default) switching mode"

"Momentary "Continuous
switching mode" reading mode"

20

Reading confirmation LED

"Disabled" "Enabled"

(default)

Power saving mode

"Ordinary mode" "Power saving
(default) mode for

standby"

Beeper control

"Disabled" "Enabled"

(default)

21

Chapter 5. Communications

The QS20H communicates with the connected PC or external equipment in
accordance with the RS-232C. You may set various communications conditions
by scanning QR-coded parameters printed in Chapter 4.

■ Communications flow

You may select either the non-acknowledge mode or the ACK/NAK mode.

Non-acknowledge mode

* You may activate or deactivate the

beeper by using the QR-coded
parameter menu given in Chapter 4.

Start

Beeps when the QS20H
has read a code.*

Initializes the timer.

CTS High?

No

Yes

Transfers a single
character.

2 seconds elapsed?

Transfers the
last character?

Beeps if an error occurs.
(No transmission possible)

End

End

No

Yes

No

Yes

22

ACK/NAK mode

* You may activate or deactivate

the beeper by using the QR­coded parameter menu given in
Chapter 4.

Start

Beeps when the QS20H
has read a code.*

Initializes the timer.

CTS High?

No

Yes

Transfers a single
character.

2 seconds elapsed?

Transfers the
last character?

Beeps if an error occurs.
(No transmission possible)

Initializes the timer.

End

Any response

received?

ACK or NAK?

One second
elapsed?

NAK
(for trans­mission
again)

ACK
(normal end)

Beeps if an error occurs.
(No response signal received)

End End

No

Yes

No

Yes

No

Yes

No

Yes

23

■ Transmission format

Header Code ID mark No. of digits Data read Terminator BCC

(1) Header

You may select either "No header" or STX.

(2) Terminator

You may select ETX, CR, LF, or CR LF.

(3) BCC

Every parity bit of BCC (block check character) is set so that all set bits at the
same bit level (including a parity bit) in the characters contained in the transmis­sion block have an even number by exclusing-ORing. Those characters do not
contain a header but include a terminator.

You may select whether BCC will be transferred. Note that BCC cannot be
transferred if the transmission block contains no header.

■ Transmission rate

4800, 9600, 19200, 38400, 57600, or 115200 bps

■ Transferable characters and port settings

If not specified as binary codes, all data will be treated as ASCII codes. Listed
below are port settings you can select. If data contains double-byte Japanese
Kanji or binary data when the character length is set to 7 bits, the QS20H will
ignore the MSB.

Start bit 1 bit (fixed)

Character length 7 or 8 bits

Parity check Even, Odd, or None

Stop bit 1 or 2 bits

24

(4) Code ID marks

Code ID marks are characters that identify the types of two-dimensional codes
and bar codes. You may select whether those ID marks will be transferred, by
using the QR-coded parameter menu.

(5) No. of digits

The number of digits in code data is expressed in 4 bytes. You may select
whether it will be transferred, by using the QR-coded parameter menu.

n1: 4th digit (0 to 9)
n2: 3rd digit (0 to 9)
n3: 2nd digit (0 to 9)
n4: 1st digit (0 to 9)

Code type Code ID mark

QR code Q

Split QR code in non-edit mode ("Structured Append") S

UPC-A or EAN-13 A

EAN-8 B

UPC-E C

ITF (Interleaved 2 of 5) I

CODABAR (NW-7) N

CODE39 M

CODE128 K

EAN-128 W

PDF417 Y

MaxCode X

Data Matrix Z

25

(6) Data read

The QS20H will transfer data read whose contents differ depending upon the
code type as described below.

• QR Code

All data read

NOTE: If the QS20H reads split QR codes in Non-edit mode, it will transfer not
only the read data but the ordinal ID number (a single byte in hex.) assigned to
the split code, the number of splits (a single byte in hex.), and parity (double
bytes in hex.).

• PDF417, MaxiCode and Data Matrix

All data read

• EAN-13

Y

1 Y2 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 C/D

where, Yn: Flag character

X

1 to X10: Data digits

C/D: Check digit

• EAN-8

Y1 Y2 X1 X2 X3 X4 X5 C/D

where, Yn: Flag character

X

1 to X5: Data digits

C/D: Check digit

•UPC-A

0 S X

1 X2 X3 X4 X5 X6 X7 X8 X9 X10 C/D

where, S: Number system character

X

1 to X10: Data digits

C/D: Check digit

26

• UPC-E

X1 X2 X3 X4 X5 X6 C/D

where, X1 to X6: Data digits

C/D: Check digit

• CODE39 and ITF (Interleaved 2 of 5)

Data read except for the start/stop codes

• CODE128 (EAN-128)

Data read except for start/stop codes, FNC codes*, and check digit

*Note that FNC1 placed in any positions except the 1st and 2nd positions
immediately following the start code will be converted into GS (1Dh) and then
transmitted. If FNC1 immediately follows the start code, the code system will
be identified as EAN-128 and the code mark “W” will be used.

• CODABAR (NW-7)

Data read, including/excluding start/stop codes

You may select whether to transmit the start/stop codes or not, by using the
QR-coded parameter menu.

27

Appendix. Specifications

External dimensions 163 x 72 x 54 mm

(6.42 x 2.83 x 2.13 inches)

Weight 135 g

230 g
(including interface cable)

Interface cable length 2 m (78.74 inches)

Scanning performance Resolution 0.25 mm (9.84 mils) min.

for two-dimensional codes

0.15 mm (5.91 mils) min.
for bar codes

Readable codes Model 1 and Model 2 of

QR Code, MicroQR,
PDF417, and MaxiCode

EAN-13/8, UPC-A/E,
CODE39, CODE128,
ITF (Interleaved 2 of 5), and
CODABAR (NW-7)

PCS value 0.45 min.

Skew angle 360˚

Elevation and inclination ±35˚

Interface RS-232C

Environments Operating temperature 0˚C to 40˚C

range

Operating humidity range 10 to 85% RH

(without dew condensation)

Ambience Without dust, dirt,

or corrosive gases

Power ratings Drive voltage 4.5 to 10.0 VDC

Power consumption Max. 1A

28

Dsub, 9-pin
(male)

PC QS20H

1
RD 2
SD 3

4
SG 5

6
RS 7
CS 8

9

1
2 SD
3 RD
4
5 SG
6
7 CS
8 RS
9

Dsub, 9-pin
(female)

■ Wiring example

Shown below is an example of wiring the QS20H up to the PC.

■ RS-232C interface

Dsub, 9-pin (female)

51

96

Pin No. Signal Functions Signal IN/OUT

2 SD (TXD) Send data Output

3 RD (RXD) Receive data Input

5SGSignal ground —

7 CS (CTS) Ready to send Input

8 RS (RTS) Request to send Output

29

■ Interface circuits

Output circuit Input circuit

Voltage polarity Logical value Control level

+0 (space) ON

-1 (mark) OFF

RS-232C LEVEL

RS-232C LEVEL

5K

TXD, RTS RXD, CTS

30

2D Code Scanner

QS20H

User's Manual

First Edition, May 1999

DENSO WAVE INCORPORATED

The purpose of this manual is to provide accurate information in the handling
and operating of the QS20H. Please feel free to send your comments regarding
any errors or omissions you may have found, or any suggestions you may have
for generally improving the manual.

In no event will DENSO WAVE be liable for any direct or indirect damages
resulting from the application of the information in this manual.