Omron V550-A20 Operation Manual

V550-A20 Operation Manual

V550-A20 Bar Code Reader

Operation Manual

Cat. No. Q01BAZ2

i

V550-A20 Operation Manual

Notice:

OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.

The following conventions are used to indicate and classify precautions in this manual. Always heed
the information provided with them. Failure to heed precautions can result in injury to people or
damage to the product.

DANGER! Indicates information that, if not heeded, is likely to result in loss of life or serious injury.

WARNING Indicates information that, if not heeded, could possibly result in loss of life or serious

injury.

Caution Indicates information that, if not heeded, could result in relatively serious or minor injury,

damage to the product, or faulty operation.

OMRON Product References

All OMRON products are capitalized in this manual. The terms Unit and Module are also capitalized
when referring to an OMRON product, regardless of whether or not it appears in the proper name of
the product.

The abbreviation “PLC” means Programmable Controller and is not used as an abbreviation for
anything else.

Visual Aids

The following headings appear in the left column of the manual to help you locate different types of
information.

Note Indicates information of particular interest for efficient and convenient

operation of the product.

1, 2, 3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.

© 1997 Omron Electronics, Inc.
BCSETUP © 1997 Omron Electronics, Inc.
DRX ® 1997 Accusort Systems, Inc.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, or by any
means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission of OMRON.

No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is constantly
striving to improve its high-quality products, the information contained in this manual is subject to change without notice. Every precaution
has been taken in the preparation of this manual. Nevertheless, OMRON assumes no responsibility for errors or omissions. Neither is
any liability assumed for damages resulting from the use of information contained in this publication.

ii

V550-A20 Operation Manual

Table Of Contents

Section One: Getting Started

Introduction 1-1
About the V550-A20 1-2
V550-A20 Specifications 1-3
Bar Code Basics 1-4
Decoding Bar Codes 1-7
How Your V550-A20 Scanning System Works 1-8
Examples of LED Functionality 1-9

Section Two: What to Do After Receiving the V550-A20

Introduction 2-1
Unpacking Instructions 2-2
Before Mounting the V550-A20 2-4
Mounting Your V550-A20 2-7
Setting Up Your V550-A20 2-11

Table Of Contents

Section Three: Connecting the V550-A20 to an External
Device

Introduction 3-1
Connecting Your V550-A20 To Other External Devices 3-2
Connecting Your V550-A20 to a PC 3-5
Connecting Your V550-A20 to a Terminal 3-7
Supplying Power to the V550-A20 3-8
Supplying a Trigger Input to the V550-A20 3-10
Using V550-A20 Parallel Outputs 3-11
Connecting Your V550-A20 To Omron PLCs 3-13

Section Four: Basic Troubleshooting and Maintenance

Introduction 4-1
Cleaning Procedure 4-2
Troubleshooting Your V550-A20 4-3

Section Five: Appendices

Appendix A: ASCII Communications 5-2
Appendix B: ASCII Chart 5-11
Appendix C: V550-A20 Read Distance Charts 5-12
Appendix D: Dimensions 5-15
Appendix F: Laser Warning Information 5-17

Glossary
Index

iii

V550-A20 Operation Manual

About This Manual:

This manual describes the operation of the V550-A20 Bar Code Reader system and in­cludes the sections described below.

Please read this manual completely and be sure you understand the information provided
before attempting to operate the system.

Section 1 Provides a general introduction to the Bar Code Reader system and the

basics of bar coding.

Section 2 Describes unpacking, mounting, and basic setup of the V550-A20.
Section 3 Explains how to connect the V550-A20 to external devices and how to supply

power to the bar code reader.

Section 4 Provides information on the cleaning procedure and some troubleshooting

techniques.

WARNING Failure to read and understand the information provided in this manual may result in

personal injury or death, damage to the product, or product failure. Please read each
section in its entirety and be sure you understand the information provided in the section
and related sections before attempting any of the procedures or operations given.

iv

V550-A20 Operation Manual

Section 2

What to Do After Receiving the V550-A20

This Section describes different types of equipment that may be used in a
V550-A20 scanning system. Next, some general scanning terms are
discussed that may be helpful while mounting your V550-A20. Finally,
this Section describes how to mount each piece of equipment within your
V550-A20 system and how to set up your V550-A20.

Some of the equipment described in this Section might not be used with
your system. Skip over sections that do not apply.

Section 2-

1

What to Do After Receiving the V550-A20

Introduction 2-1
Unpacking Instructions 2-2
Before Mounting the V550-A20 2-4
Mounting the V550-A20 2-7
Setting Up the V550-A20 2-11

1

Section 2-

2

What to Do After Receiving the V550-A20

Depending on your needs, you may have one, or more, of the follow-

Unpacking

ing pieces of equipment:

Instructions

Power Supply - A power supply is available from Omron. Please

!

CAUT ION

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electricity.

make sure that you have the correct one for your application. Con­necting the wrong power supply to the V550-A20 will result in dam­age to the V550-A20. A UL Class 2 power supply should be used for
UL approval.

V550-A20 Operation Manual

Omron S82S-0305 Power Supply (not UL Class 2)

Mounting Hardware - five different mounting options are offered.
All of the options depend on the type of application they are to be
used in. Each is described below with its part number:

Mounting Clips
part # V509-A26F

Mounting Plate
part # V509-A26A

Ladder Mounting Bracket
part # V509-A26E

Cradle Mounting Bracket
part # V509-A26B

Picket Fence
Mounting Bracket
part # V509-A26D

2

Mounting Brackets

V550-A20 Operation Manual

Programming Kit - The Programming Kit connects the V550-A20 to a
standard 9 pin serial port on the back of a personal computer when
setting-up the V550-A20 software. The PC setup program is called
BCSETUP. Refer to your BCSETUP manual for details about pro­gramming the V550-A20. This kit can be used to provide only power
and RS232 communications, if no other signals are to be used in the
application.

Section 2-

3

What to Do After Receiving the V550-A20

Programming Kit

110V AC part # V559-A25C

3

Section 2-

4

What to Do After Receiving the V550-A20

There are a few common terms in bar code scanning that you need to

Facts To Know

Before

Mounting Your

know before you mount your V550-A20. Understanding these terms
will help you when you mount your scanner or if you ever have to
move your scanner from its original mounting place.

V550-A20

Ladder orientation refers to a bar code whose bars are parallel to the
bar code's direction of travel. Picket Fence means that the bars of the
bar code are perpendicular to the direction of travel. Regardless of
the direction of travel, the scan line must be perpendicular to the bars.

V550-A20 Operation Manual

Direction of Travel

Bar Codes In Ladder (left) And Picket Fence (right) Orientations

Tilt, Pitch, and Skew refer to the way the bar code lines up with the
scan line. In the drawing below, the bar code is perpendicular to the
scan line. The skew axis is parallel to the scan line in this position.
The pitch axis is parallel to the bars in this position. The tilt axis is
perpendicular to the plane of the scan window.

Pitch Axis

Skew Axis

Tilt Axis

4

V550-A20

The Tilt, Pitch, and Skew Axes

V550-A20 Operation Manual

Tilt is the way the bar code rotates around the tilt axis. Similarly,
pitch and skew occur when the bar code is rotating around those axes.

Pitch

Section 2-

5

What to Do After Receiving the V550-A20

Pitch

Pitch

Skew

Tilt

Tilt

Skew

Skew

Tilt

Tilted, Pitched, and Skewed Bar Codes

The Exit Window is where the laser beam exits the scanner. Near
Distance, also called Optical Throw, is the closest the V550-A20 can

be to the bar code and still read the bar code passing through its scan
line. The Far Distance is the farthest distance at which the V550-A20
can read a bar code. The Depth of Field is the range over which the
V550-A20 can read bar codes. To calculate your Depth of Field,
subtract the Near Distance from the Far Distance. The V550-A20's

Optimum Distance is the Center of the Depth of Field. The Scan
Window is the usable amount of the laser beam at any given depth of

field.

Depth of Field

Exit Window

Near Distance

Optimum Distance

Far Distance

Shaded area is the read area

Illustration of Scanning Terms

5

Section 2-

6

What to Do After Receiving the V550-A20

When you mount your V550-A20, make sure there is enough space
around the unit for the connections to the accessories needed for your
application. There must also be enough room to allow the V550-A20
and its equipment to stay cool. The minimum space requirements for
the V550-A20 are as follows:

• Overhead - Leave enough room for air flow

• Back - 2.25" for connections

• Sides - Leave enough room for air flow

• Front - Make sure there are no obstructions between the scanner
and the bar code to be scanned during the read cycle

There are many different ways to mount the V550-A20. You can
purchase the following five pieces of equipment from Omron to
mount the V550-A20:

V550-A20 Operation Manual

You can use any type of

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Clips (part # V559-A26F)

There are two mounting clips. They are designed to hold the
V550-A20 in a position so the scan line is parallel to the mounting
surface. Each clip has an oblong slot designed for a #6 mounting
screw. The mounting screws are to be located 2.9 inches apart. The
V550-A20 has grooves on each side. Use these grooves with the
mounting clips as shown below, to mount the V550-A20.

To mount the V550-A20:

Step 1 Fasten one clip to the mounting surface.

Step 2 Slide the grooves on one side of the V550-A20 along

the clip.

Step 3 Place the remaining clip in the grooves on the other

side of the V550-A20.

Step 4 Fasten that clip to the mounting surface. This ensures

a tight mount so the V550-A20 does not have any room
for movement during operation.

6

2.9"

Mounting The V550-A20 Using Mounting Clips

V550-A20 Operation Manual

Section 2-

7

What to Do After Receiving the V550-A20

Mounting Your

V550-A20

Mounting Plate (part # V559-A26A)

There is one mounting plate, one mounting clip, one #6-32 nut, and
one #6 internal tooth lockwasher included with this assembly. The
mounting plate is designed to hold the V550-A20 in position so the
scan line is parallel to the mounting surface. The plate is rectangular
with an oval slot near each of the four corners. The slots are designed
for #6 mounting screws.

To mount the V550-A20:

Step 1 Fasten the plate to the mounting surface.

Step 2 The plate has one fixed retaining clip, one #6-32 stud

and one #6 nut that holds the adjustable clip. Place
the V550-A20 in position so the slot in the side of
the housing is engaged by the fixed clip.

Step 3 Move the adjustable clip towards the V550-A20 until it

engages the other slot of the V550-A20 housing.

Step 4 Tighten the nut on the stud to secure the V550-A20.

This ensures a tight mount so the V550-A20 does not have any room
for movement during operation, and it also allows you to remove the
V550-A20 and replace it with the use of only one nut.

PEM FH-632-6

1.47
.99

.25

.32

.156 x .281 slot
4 PL

1.97

2.84

3.42

R .06
4 PL

Mounting The V550-A20 Using The Mounting Plate

7

Section 2-

8

What to Do After Receiving the V550-A20

Ladder Mounting Bracket (part # V559-A26E)

The ladder mounting bracket is designed to hold the V550-A20 in a
position so the scan line is perpendicular to the mounting surface.
The bracket fits around the V550-A20, but is not directly secured to
the V550-A20. Flanges on the bracket provide oblong slots that are
designed for #6 mounting screws on either side of the V550-A20.
Mounting screws need to be located 2.25 inches apart.

To mount the V550-A20:

Step 1 Place the bracket around the V550-A20 so the backing

Step 2 Place the mounting bracket, with the V550-A20

V550-A20 Operation Manual

of the bracket rests on one of the sides of the V550-A20,
as shown below.

clamped inside, against the mounting surface.

Step 3 Insert and tighten the mounting screws in the oblong

slots on the bracket. This ensures the V550-A20 is
secured within the bracket against the mounting
surface.

2.25"

8

Mounting The V550-A20 Using The Ladder Mounting Bracket

V550-A20 Operation Manual

Picket Fence Mounting Bracket (part # V559-A26D)

The picket fence mounting bracket is designed to hold the V550-A20
in a position so the scan line is parallel to the mounting surface. The
bracket fits around the V550-A20, but is not directly secured to the
V550-A20. Flanges on the bracket provide oval slots that are designed
for #6 mounting screws on either side of the V550-A20. Mounting
screws need to be located 3.00 inches apart.

To mount the V550-A20:

Step 1 Place the bracket around the V550-A20 so the backing

Step 2 Place the mounting bracket, with the V550-A20

Section 2-

What to Do After Receiving the V550-A20

of the bracket rests on top of the V550-A20, as shown
below.

clamped inside, against the mounting surface.

9

Step 3 Insert and tighten the mounting screws in the oblong

slots on the bracket. This ensures the V550-A20 is
secured within the bracket against the mounting
surface.

3.0"

Mounting The V550-A20 Using The

Picket Fence Mounting Bracket

9

Section 2-

10

What to Do After Receiving the V550-A20

Cradle Mounting Bracket (part # V559-M26B)

There is one cradle mounting bracket, one 2-1/8" #6-32 round spacer,
two 3/8" #6-32 socket head cap screws, two #6 flat washers, and two
#6 split lockwashers included with this assembly. The cradle mount­ing bracket is designed to hold the V550-A20 in a position so the scan
line is parallel to the mounting surface. Four #6-32 Pem nuts are
provided on the bottom of the bracket.

To mount the V550-A20:

The top edges on both sides of the cradle are bent at a
90 degree angle. This results in two flanges that fit
into the slots on the sides of the V550-A20. There are
six slots on each side of the V550-A20. Different sets of
slots can be used with the following results:

V550-A20 Operation Manual

Bottom Slots:

overall height (bracket and V550-A20) - 2.75"

PEM S-632
4 PL

Units = inches

Four up from bottom:

overall height (bracket and V550-A20) - 2.05"

1.50

.24

1.40

.46

10

Mounting The V550-A20 Using The

Cradle Bracket

V550-A20 Operation Manual

The steps below represent one recommended scenario to set up your

Setting Up Your

V550-A20 Scanning System:

V550-A20

Step 1: Remove all materials from the box.

Step 2: Make all the appropriate connections to your V550-A20 as

Step 3: If you need to make any programming changes to your

Step 4: Mount your V550-A20 as described earlier in this Section.

Step 5: Begin reading your bar codes.

Section 2-

What to Do After Receiving the V550-A20

explained in Section Three.

V550-A20, connect your V550-A20 to a PC or terminal as
described in Section Three of this manual, and refer to your
BCSETUP Programming Manual.

11

If you have any problems or questions concerning setting up your
V550-A20, contact your Omron Distributor immediately.

11

Section 2-

12

What to Do After Receiving the V550-A20

V550-A20 Operation Manual

12

V550-A20 Operation Manual

Section 3

Connecting Your V550-A20 To An External Device

This chapter explains how to connect your V550-A20 to external devices
including a PC and Terminal. This chapter also explains how to supply
power to your V550-A20. You must make these connections before you
can begin setting up or using your V550-A20.

Section 3-

1

Connecting Your V550-A20 To An External Device

Introduction 3-1
Connecting to other External Devices 3-2
Connecting to a PC 3-5
Connecting to a Terminal 3-7
Supplying Power to the V550-A20 3-8
Supplying a Trigger Input to the V550-A20 3-10
Using V550-A20 Parallel Outputs 3-11
Connecting to Omron PLCs 3-13

1

Section 3-

2

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Note: Connectors are shown from the soldering side

Connecting

The shield is electrically connected to both cable shells.

Your V550-A20

To Other

External

Devices

V550-A20 End of Cable

Model 20 End of Cable

(15 pin female “D”)

(15 pin female "D")

The V550-A20 is versatile when you need to connect to other devices.
The drawings below shows all the pin connections for V550-A20 when
using serial communications. If you need to create your own cables to
wire your V550-A20 to another device, use these drawings as a guide.
It is very important that you make the proper pin connections.

Below is a list of terms used in these drawings:

GND-Ground RXD-Receive Data (RS-232)
TXD-Transmit Data (RS-232) RTS-Request To Send (RS-232)
CTS-Clear To Send (RS-232) RD+ -Receive Data (RS-422)
RD-Receive Data (RS-422) SD+ -Non-inverting Line (RS-485)
SD- -Inverting Line (RS-485) Send Data (RS-422)

Send Data (RS-422)

2

V550-A20 Operation Manual

RS-232 With No Handshaking

Section 3-

3

Connecting Your V550-A20 To An External Device

Be careful when you
wire your own cable for
the V550-A20. You
must make sure that
V550-A20 receives only
5 volts on pins 14 and

15.

You must enable
communication types
using the software.
Refer to your BCSETUP
Manual for more
information.

Use the following drawing as a guide when you want to connect your
V550-A20 to a device that is using RS-232 communication with no
handshaking:

NOTE: All connectors are shown from the soldering side.

V550-A20

1

6

15

NOTE: Recommended Cable Type: ALPHA # 5473C or

GND

1

TXD

2

RXD

3

CTS

5

GND

11

+5VDC

15

Equivalent Maximum Cable Length: 50 Feet

HOST

GND
RXD
TXD

CTS
RTS

RS-232 With RTS/CTS Handshaking

Use the following drawing as a guide when you want to connect your
V550-A20 to a device that is using RS-232 communication with RTS/
CTS handshaking:

NOTE: All connectors are shown from the soldering side.

V550-A20

1

6

GND

1

TXD

2

RXD

3

CTS

5

15

GND

11

+5VDC

15

HOST

GND
RXD
TXD

CTS
RTS

NOTE: Recommended Cable Type: ALPHA # 5473C or

Equivalent Maximum Cable Length: 50 Feet

3

Section 3-

4

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

RS-422 (point to point)

Use the following drawing as a guide when you want to connect your
V550-A20 to a device that is using RS-422 serial communication:

NOTE: All connectors are shown from the soldering side.

You must enable
communication types
using the software.
Refer to your BCSETUP
Manual for more
information.

V500-A20

V550-A20

1

6

15

220

Termination

GND

1

SD+

6

SD-

8

RD+

7

RD-

9

220

Termination

HOST

S. GND
RD+
RD-

SD+
SD-

NOTE: Termination resistors may be placed inside the connector strain relief.
The termination resistor value is 220 OHM 1/4 watt.
With RS-422, the receive lines on both sides must be terminated.

CABLE TYPE: ALPHA #5473C (OR EQUIVALENT).

RS-485 Multidrop

Use the following drawing as a guide when you want to connect your
V550-A20 to a device that is using RS-485 Multidrop serial
communication:

NOTE: All connectors are shown from the soldering side.

220

V550-A20

1

6

15

End Of The Line

1
6
8

1
6
8

1
6
8

GND
SD+/RD+
SD-/RD-

GND
SD+/RD+
SD-/RD-

GND

SD+/RD+

SD-/RD-

Termination

(Polling Required)

HOST

S. GND
SD+/RD+

SD-/RD-

End Of The Line

4

220

Termination

NOTE: RS485 allows for communication across the same lines

NOTE:

Termination resistors can be placed inside the connector strain relief.
The termination resistor value is 220 OHM 1/4 watt.
The transmit-receive lines on both sides must be terminated.

Cable type: Alpha #5473C (or equivalent)

Cable type: Alpha #5473C (or equivalent)

RS-485 allows for communication across the same lines
Termination resistors can be placed inside the connector strain relief.
The termination resistor value is 220 OHM 1/4 watt.
The transmit-receive lines on both sides must be terminated.

V550-A20 Operation Manual

Connecting Your V550-A20 To A PC

Omron recommends that you purchase the Programming Kit for your
V550-A20. This kit provides you with the cables that you need to
connect your Omron device to a PC. If you would like to purchase
the Programming Kit, call your local Omron distributor with the
following information:

Part Name Part Number

Programming Kit V559-A25C

Section 3-

5

Connecting Your V550-A20 To An External Device

Programming Kit

Programming Kit

V550-A20 Programming Kit

110V AC part # V559-A25C

110V AC part # V559-A25C

To connect your V550-A20 to most PCs using the Programming Kit:

Step 1 Plug in the 15 pin connector on the BCR-to-PC cable

to the 15 pin connector on the back of your V550-A20.

Step 2 Plug in the 9 pin connector end of your BCR-to-PC

cable to a 9 pin serial port on your PC.

Step 3 Use a small standard slotted screwdriver to tighten

the screws on the strain reliefs at both ends.

Step 4

Plug the power supply unit into an appropriate

wall socket.

5

Section 3-

6

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Connecting To A PC Without Programming Kit

If you choose not to purchase the Programming Kit, you need to make
your own cables. The following pinout diagrams show typical RS-232
communication cable pin connections from your PC to your V550-A20
with connector and cable specifications.

Specifications

15 pin connector - Assmann part # A-HDF15LL-T or equivalent

9 pin connector - CINCH part # DEM-9S or equivalent

Cable - Alpha part # 5473C, Manhattan Part # M3264, or equivalent

15 pin & 9 pin strain relief - Northern Technologies part # C88300004
or equivalent

If your PC has a 25 pin
serial connector, you can
use any standard 9 pin
to 25 pin mating
connector adapter to
make the connection.

6

V550-A20 to PC Connections

V550-A20 Operation Manual

Connecting Your V550-A20 To A Terminal

If you are using a Terminal to program your V550-A20, you need to
make your own cables. The following pinout diagrams below show
typical RS-232 communication cable pin connections from your
Terminal to your V550-A20 and connector and cable specifications.
These pin connections are correct for most Terminals. Your Terminal
may be different. Before you begin making your cable, check your
Terminal documentation to make sure these pin connections are
accurate.

Specifications

15 pin connector - Assmann part # A-HDF15LL-T or equivalent

25 pin connector - CINCH part # DEM-25P or equivalent

Section 3-

7

Connecting Your V550-A20 To An External Device

Cable - Alpha part # 5473C, Manhattan Part #M3264, or equivalent

25 pin strain relief - Northern Technologies part # C88220004 or
equivalent

15 pin strain relief - Northern Technologies part # C88300004 or
equivalent

NOTE: All connectors are shown from the soldering side.

Standard 25 Pin
Terminal Connector

25

1

25 Pin
Male "D"

CRT

15 PIn
Female "D"

Model 20

1

6

Terminal to Omron Bar Code Reader Connections

15

7

Section 3-

8

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Supplying

Power to Your

V550-A20

You must supply power to the V550-A20 through the 15 pin connec­tor at the rear of the unit. You can supply power using one of the
following two methods: using an Omron local power supply or
wiring power directly into the V550-A20 using one of your own
methods.

The V550-A20 must meet the following three requirements regardless
of the method that you use to supply power:

• +5VDC must be supplied

(range between +4.85VDC and +5.25VDC @ 500 mA typical, 600 mA max.,
maximum ripple 100mV)

• Ground must be supplied

• Metal shell of connector must be grounded

Make sure the metal shell of the connector is grounded. This pro­vides chassis ground to the unit case, and is necessary for proper
operation.

When you are using
Omron's local power
supply, make sure the
metal shell of the
connector is grounded.

Using Omron's Power Supply For Power

You can use the Omron S82S-0305 power supply to supply power to
the V550-A20 15 pin "D" connector. Note that a UL class 2 power
supply should be used for UL approval. This power supply is shown
below:

Omron power supply (not UL Class 2)
S82S-0305

If you use this power supply, you need to connect cable leads to the
V550-A20 15 Pin "D" connector. Use the following information to
make these connections:

110V and 220V Power Supply V550-A20 Pin #

Ground Pin 11
+5V Pin 15

If no ground is available from another source, you can connect to the
ground terminal of the power supply. This grounds the shell/case.

8

V550-A20 Operation Manual

Wiring Other Sources Of Power Directly

Section 3-

9

Connecting Your V550-A20 To An External Device

When you are providing
power to the V550-A20
directly from another
source, make sure the
metal shell of the
connector is grounded.

Isolation may be
required, if the chassis is
used as a conductive
plate.

To supply power to the V550-A20 15 pin "D" connector, you can use
many other sources than previously mentioned. You must comply
with the V550-A20 power requirements, mentioned in the beginning
of this section, to ensure proper operation.

The drawings below show alternate ways of wiring power into the
V550-A20:

V550-A20

1

6

V550-A20

1

6

15

15

1
15

1
15

GND
+5VDC

GND
+5VDC

Power Source

Power Source

Alternative Wiring Methods for

Supplying Power to The V550-A20

9

Section 3-

10

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

A triggering device can be used to supply an electronic signal or pulse

Supplying A

Trigger Input

To Your

V550-A20

to inform the scanner of the presence of an object within its reading
zone. You can wire a triggering device directly to the V550-A20 15 pin
connector using pins 11 and 13. The drawing below shows two of the
most common ways to wire a triggering device directly to your
V550-A20.

Note: Connector is shown
from the soldering side.

V550-A20 15 pin female "D"

Normally
High

Closed =
Triggered

DEM-9P

74XX

V550-A20 represents
approximately 1 TTL load

DEM-9P

J1

13

15

J1

1111

11
13

15

J1

J1

1111

11
13

13

15

15

GND
GND
Trigger
+5V

GND
GND
Trigger
+5V

Two Different Ways To Wire A

Triggering Device To Your V550-A20

(Top-TTL Method, Bottom-Dry Contact Method )

10

V550-A20 Operation Manual

The V550-A20 has two parallel outputs; NVC/NO MATCH and

Using V550-A20

Parallel Outputs

GO/MATCH. These output timers are activated or deactivated from
pin 4 and pin 5 respectively on the V550-A20 15 pin connector. Both
of these outputs are controlled by software. (Refer to your BCSETUP
Manual.)

You can use these outputs to have a beeper sound when you receive a
no read or no match (when used as a verifier), or you could have a
light turn on every time there is a go (good read) or match (when
used as a verifier). There are many other uses for these outputs.

How The Outputs Work

Section 3-

11

Connecting Your V550-A20 To An External Device

The Go/Match (out 1)
output can not be
enabled when RTS/CTS
protocol is enabled.
(Refer to your BCSETUP
Manual.)

The names of the two outputs directly reflect their purpose. The
NVC/NO MATCH output changes its electrical state dependent on
receiving a no read or a no match (while in verifier mode). The
GO/MATCH output timer changes its electrical state dependent on
receiving a good bar code or a match (while in verifier mode).

These outputs are open collectors. When the signal is low, it causes
the state of the output to remain unchanged. When the signal is high,
it causes the state of the output to change. For example, if you set the
NVC/NO MATCH timer for 150 milliseconds, every time the scanner
sees a non valid bar code the NVC/NO MATCH timer signal remains
high until that 150 millisecond time period is complete.

11

Section 3-

12

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Parallel Output Connections

The following diagrams show the proper connections that you need
to ensure that the outputs function properly.

V550-A20

1

6

15

1
4

GND
OUT 0

-

Load

+

+

For true TTL compatible
output from pin 5, an
external 750 OHM
pullup resistor is
required between pin 5
and pin 14.

V550-A20

1

6

15

1
5

GND
OUT 1

Load

+

-

+

Output Connections

The table below defines some basic terminology. The drawing below
shows the schematic of the outputs circuitry:

+5V

V550-A20

Model 20

1

6

2 TTL
Outputs

(Optional CTS)

15

Pins

4
5

OUT 0
OUT 1/CTS

+5V

10K 10K

3 to 7 KOHM
RS232
IC

OHM

820

3

2

1

OUT 0

OHM

820

OUT 1

12

The V550-A20 Output Circuitry

V550-A20 Operation Manual

SYSMAC Series CQM1 Controller with RS-232

PLC

Connection

Connection

Operation

Examples

Switch ON the trigger switch (7) shown above to execute V550-A20 to
read and send data to the data memory area of CQM1. Use the pro­gram console (3) to confirm the data. In the event the data were not
read, press “?” after the trigger switch is OFF.

Section 3-

13

Connecting Your V550-A20 To An External Device

3 1 2 7 4 6

5

V550-A20 Setup

• Communication Condition (Setup):
Baud Rate: 9600 bps
Word Length: 7 bit
Parity: EVEN
Stop Bit: 2 bit

• Trigger Requirements:
Start Code: S
Stop Code: E
Data Output Mode: Single Output
Scan Trigger Type: Serially

Controlled

Trigger Stage: Standard

1 Power supply unit CQM1-PA206
2 CPU unit CQM1-CPU21
3 Programming CQM1-PRO

console
4 Bar code reader V550-A20
5 Connecting cable V559-A32A-2M
6 BCR power supply S82S-0305

(5V 0.6A) (see note)

7 Trigger switch relay or switch

NOTE: Not rated for UL class II operation.

CQM1 Setup

• Communication Condition:
Set OFF the dip switch 5 of CQM1 and set [1000] on DM6645 to
match the communication condition with BCR (refer to the CQM1
Programming Manual for the detailed way to change the condition).

• Setting of Start Code & Stop Code:
Set [1000] on DM6648, and set [0D00] on DM6649.

• On the DM, set the ASCII Code [S] to Start Reading, and [E] to Stop
Reading.

• Connection of Trigger Switch:
Connect the trigger switch to the Input Port [00000] Terminal on the
CPU unit to enable to send [S] or [E] through the RS232C line when
the BCR is ON or OFF, respectively.

• Save the received data from the BCR in order from upper digit,
DM0200 must be the top, to down.

13

Section 3-

AR0806

RXD(47)
DM0200

#0000

AR09

Store data from DM0200 buffer

MSG(46)

DM0200

Indicate 16 levels of
DM0200 To programmable controller

00102

AR0805

TXD(48)
DM0101

#0000
#0001

Send 1 byte of DM0101 [ Set to 5300]
(S: send command to stop reading)

14

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Confirmation of Operation

• After programming, set RUN mode and set the trigger switch ON to
execute the reading with the LED on the BCR lighting.

• Press the key in the order below in order to confirm the data with
the console:
① CLEAR ➝ ➁ FUN ➝ ➂ MONITOR

• The “?” is indicated, in the event that the data can’t be read until the
trigger is OFF.

CQM1 Programming

00000

00003

00007

00010

00010

00000

00101

AR0806

00102

DIFU(13)00101

(DIFFERENTIATE UP on rising pulse)

DIFD(14)00102

(DIFFERENTIATE DOWN on falling pulse)

AR0805

AR0805

TXD(48)
DM0100

#0000
#0001

BSET(71)

#0000
DM0200
DM0220

RXD(47)
DM0200

#0000

AR09

MSG(46)

DM0200

TXD(48)
DM0101

#0000
#0001

Trigger Switch ON

Trigger switch OFF

Send 1 byte of DM0100 [Set to 4700]

(G: send command to start reading)

DM0200-DM0220 clear
(assume 20 readable digits)

Send 1 byte of DM0101 [ Set to 5300]

Store data from DM0200 buffer

(E: send command to stop reading)

Indicate 16 levels of
DM0200 To programmable controller

Send 1 byte of DM0101 [ Set to 5300]
(S: send command to stop reading)

14

V550-A20 Operation Manual

SYSMAC Series C200HS or C200H Alpha with RS-232
Connections

Operation

Switch ON the trigger switch (7) shown above to execute V550-A20 to
read and send data to the data memory area of C200■■. Use the pro-
gram console (6) to confirm the data. In the event the data were not
read, press “?” after the trigger switch is OFF.

Section 3-

15

Connecting Your V550-A20 To An External Device

2 1

7

4

V550-A20 Setup

6

3 5

1 CPU unit C200HS-CPU21
2 Built-in RS232 port
3 Bar code reader V550-A20
4 Connecting cable V509-A32A-2M
5 Power supply S82S-0305

(5V 0.6A) (see note)

6 Programming C200HS-PRO27

console

7 Trigger switch

NOTE: Not rated for UL class II operation.

• Communication Condition (Setup):
Baud Rate: 9600 bps
Word Length: 7 bit
Parity: EVEN
Stop Bit: 2 bit

• Trigger Requirements:
Start Code: S
Stop Code: E
Data Output Mode: Single Output
Scan Trigger Type: Serially

Controlled

Trigger Stage: Standard

C200HS or C200H Alpha Setup

• Communication Condition:

Set OFF the dip switch 5 of C200HS or C200H Alpha and set [1000] on
DM6645 to match the communication condition with BCR (refer to
the Reference Manual for the detailed way to change the condition).

• Setting of Start Code & Stop Code:

Set [1000] on DM6648, and set [0D00] on DM6649.

• On the DM, set the ASCII Code [S] to Start Reading, and [E] to Stop

Reading.

• Connection of Trigger Switch:

Connect the trigger switch to the Input Port [00000] Terminal on the
CPU unit to enable to send [S] or [E] through the RS232C line when
the BCR is ON or OFF, respectively.

• Save the received data from the BCR in order from upper digit,

DM0200 must be the top, to down.

15

Section 3-

00000

00000

00003

00007

00010

DIFU(13)00101

00101

00102

26405

26406

26405

Trigger Switch ON

(DIFFERENTIATE UP on rising pulse)

Trigger switch OFF

(DIFFERENTIATE DOWN on falling pulse)

DIFD(14)00102

Send 1 byte of DM0100 [Set to 4700]

(G: send command to start reading)

TXD(48)
DM0100

#0000
#0001

BSET(71)

#0000
DM0200
DM0220

RXD(47)
DM0200

#0000

265

DM0200-DM0220 clear
(assume 20 readable digits)

Store data from DM0200 buffer

MSG(46)

DM0200

Indicate 16 levels of
DM0200 To programmable controller

TXD(48)
DM0101

#0000
#0001

Send 1 byte of DM0101 [ Set to 5300]
(S: send command to stop reading)

16

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Confirmation of Operation

• After programming, set RUN mode and set the trigger switch ON to
execute the reading with the LED on the BCR lighting.

• Press the key in the order below in order to confirm the data with
the console:
① CLEAR ➝ ➁ FUN ➝ ➂ MONITOR

• The “?” is indicated, in the event that the data can’t be read until the
trigger is OFF.

C200HS or C200H Alpha Programming

00102

00010

26406

26405

TXD(48)
DM0101

#0000
#0001

RXD(47)
DM0200

#0000

265

MSG(46)

DM0200

Send 1 byte of DM0101 [ Set to 5300]

Send 1 byte of DM0101 [ Set to 5300]

(E: send command to stop reading)

(S: send command to stop reading)

Store data from DM0200 buffer

Indicate 16 levels of
DM0200 To programmable controller

16

V550-A20 Operation Manual

PLC Master/Slave System

SYSMAC Series C200H Alpha…RS-485 Multidrop:

4

1 CPU C200H…
2 Bar code reader V550-A20
3 Power supply unit S82S-0305 (5V, 0.6A)

4 Communications Board C200HW-COM06-E

Section 3-

17

Connecting Your V550-A20 To An External Device

2 31

(see note)

NOTE: Each bar code reader requires a minimum of

500 mA to operate. If your system contains more
than 1 bar code reader in parallel, select a
power supply rated for a higher output current.

Connection with Multiple Readers:

Up to 32 slaves can be connected for each serial port on the master
(depending upon line length and required response time).

• Operation:
The master device, C200H…, sends poll messages to the slave BCRs
requesting them to respond with data. The BCRs respond to the
polls. There is no response if they are not polled by the master.

• Message Formats:

V550-A20 Communication Setting

Basic Setting READ Trigger Level Trigger

Read Mode Single
Communication Baud Rate 9600 bps
Condition (Default) Word Length 7 bits

Parity EVEN

Stop Bits 2 bits

Header STX

Footer CR

RS/CS Control OFF

17

Section 3-

18

V550-A20 Operation Manual

Connecting Your V550-A20 To An External Device

Framing for all messages sent by any device on the multidrop line:

FF STX ID TYPE SEQ DATA LRC CR

FF (hex) Guard character Ignored by receiver.
STX (02hex) Start of text character Indicates start of a message.
ID (2 ASCII digits) Unit identifier Indicates BCR identification

TYPE (2 ASCII digits) Message type Describes purpose of the message.
SEQ Sequence number Starts at 0 at power up;

DATA Content of data field May or may not contain characters.
LRC (2 ASCII digits) Linear redundancy Checks to ensure that message is

checks valid.

CR Carriage return Indicates end of message.

C200H Alpha Communications Board Connections:

The connections from the bar code reader connectors to the C200H
Alpha COM board are shown below.

number.

incremented by 1 for each data
message sent.

V550-A20 C200HX/C200HG/C200HE
Bar Code Reader Communications Board

V550-A20 Pin Configuration C200H Alpha COM

Board Pinout

Note: The above connection is shown using the C200H Alpha PLC
with protocol macro function. Contact OMRON for the latest V550­A20 Protocol macro.

18

V550-A20 Operation Manual

Section 4

Basic Troubleshooting and Maintenance

The V550-A20 hardware was specifically designed for the tough industrial
environment. The unit does not need anything more than some basic
cleaning and a checkup every once and awhile. This chapter provides
you with a cleaning procedure and some troubleshooting techniques.

Section 4-

Basic Troubleshooting and Maintenance

Introduction 4-1
Cleaning Procedure 4-2
Troubleshooting the V550-A20 4-3

1

1

Section 4-

2

Basic Troubleshooting and Maintenance

V550-A20 Operation Manual

Cleaning

Procedure

The V550-A20 enclosure is tightly sealed to prevent dust or
dirt from entering the unit. Nothing inside the V550-A20
needs to be cleaned on a regular basis. If the V550-A20 needs
repair, do not open the unit. The V550-A20 is designed to be
shipped back for repair. Refer to your Omron distributor for
more information.

To clean the V550-A20:

Step 1: Slightly dampen a lint-free cloth with a

solution made of mild detergent and water.

Step 2: Gently wipe the enclosure of the V550-A20.

Be careful to avoid the exit window.

Step 3: Dry the enclosure of the V550-A20 with a dry

lint-free cloth.

To clean the V550-A20 exit window:

Step 1: Dampen a lint-free tissue with distilled water

and wipe off any dust particles.

Step 2: Dry the exit window with a dry lint-free

tissue.

2

V550-A20 Operation Manual

Use the following chart to help troubleshoot the V550-A20. If your

Troubleshooting

V550-A20 is damaged, please contact your Omron distributor.

Your V550-A20

Section 4-

3

Basic Troubleshooting and Maintenance

Is there dust
on the V550-A20?

N

Are all the
connections tight?

Y

Are any cables
damaged?

N

Does the LED blink yellow
when power is supplied to the
V550-A20?

Y

The V550-A20 is ready for operation

Y

N

Y

N

Use the steps on page
5-2 to clean the V550-A20.

Refer to Chapter 3 and tighten
the connections

Fix or replace the
damaged cables

Contact your Omron distributor
for more information

3

Section 4-

4

Basic Troubleshooting and Maintenance

Problem/Solution List

The following is a list of problems that could occur with your scan­ning system. Listed below each event is a cause and solution.

Problem: The Status LED turns red for and extended period of time

or it blinks.

Cause: The V550-A20 detects a failure.

Solution: Call your Omron distributor.

Problem: There is no laser beam exiting from the scanner when

power is supplied.

Cause: No power is applied to the V550-A20.

Solution: Check to ensure power is plugged in and power is applied

to the interface connector.

V550-A20 Operation Manual

Problem: The V550-A20 is not reading bar codes.

Cause: Code type is not enabled or is the wrong code

length.

Solution: Enable code type or correct code length.

(Refer to section 5-6 of the BCSETUP Programming

Manual.)

Problem: V550-A20 has poor read rate.

Cause: V550-A20 window is dirty, label is not within

reading range, or label quality is poor.

Solution: Clean V550-A20 window, check reading range or

label, or check code quality.

Problem: V550-A20 has poor read rate in hardware trigger.

Cause: Trigger switch not adjusted, or it is misaligned.

Solution: Adjust the triggering device.

Problem: V550-A20 has poor read rate in serial or trigger.

Cause: Serial trigger is not timed properly with the arrival

of the bar code.

Solution: Adjust the timing of your serial trigger so it turns on

before the bar code and turns off after the bar code.

Problem: No communication to host.

Solution: Connect the V550-A20 to a PC and use BCSETUP to confirm

4

Cause: Host communication to scanner does not match.

communications parameters.

V550-A20 Operation Manual

Section 5

Appendices

Section 5-

1

Appendices

Appendix A:
ASCII Communications 5-2

Appendix B:
ASCII Chart 5-11

Appendix C:
V550-A20 Read Distance Charts 5-12

Appendix D:
V550-A20 and Accessories Dimensions 5-15

Appendix E:
Laser Beam Safety 5-17

1

Section 5-

Appendices

2

V550-A20 Operation Manual

Standard RS-485 Multidrop Communications

RS-485 communications is an Engineering Industries Association standard

for the transmitters and receivers of a digital equipment interface. RS485
communication uses differential signal lines and allows for multiple trans­mitters on one signal pair (although only one transmitter may be enabled at
any given time). This is a way of allowing one device to communicate with
one or more other devices using the Master /Slave method.

The Master/Slave system works as follows:
The master device (usually a decoder logic or computer) originates poll

messages. The poll message is a message from the master to a slave request­ing the slave to respond with data (if data is available). The slave is usually
a bar code scanner. The slave device responds to the polls from the master.
It is not allowed to transmit unless it has been “asked” (polled) by the
master.

Shown below is a simplified drawing of one way that RS-485 communica-

tions works:

NOTE: This representation shows one Master and six slaves. You can

ultimately have up to 32 slaves for each serial port on the master (depending
on the line length and required response time).

Slave

MASTER

Slave

Slave

Slave

2

Slave

Slave

V550-A20 Operation Manual

The remainder of this section defines the message formats and timing

requirements for the protocol used on RS-485 multidrop (2-wire) communi­cations lines. The protocol is defined for both the “master” device and the
“slave” devices. This protocol is defined for a one-master system only. The
following definitions may help you understand this protocol a little better.

ASCII digit: This means the ASCII code for a single decimal digit. For

example, 30h is the ASCII digit that encodes a zero.

HEX digit: This means the ASCII code for a single hexadecimal digit. Some

examples are, 35h is the code for a five, 42h is the code for a "B" (which
equals 11 base 10), the hexadecimal number "5A" would be encoded by the
two HEX digits 35h and 41h.

Message Formats

The standard communications parameters are as follows:
Standard asynchronous data frame (least significant bit first)

Section 5-

Appendices

3

7 data bits
1 even parity bit
2 stop bits

If the master can only support 8 bit data plus a parity bit, then the
format is as follows:

8 data bits
1 odd parity bit
1 stop bit

(Odd parity is required to make sure that the guard character will be
all ones with one for parity.)

You can use any baud rate that is supported by both the master and
the slaves. System performance is usually best when using the
highest baud rate possible.

3

Section 5-

Appendices

4

V550-A20 Operation Manual

The following is framing for all messages sent by any device on the
multidrop line:

FFH STX ID(2) TYPE(2) SEQ DATA LRC(2) CR

(FFhex) = Guard Character

This character is "sacrificed" to the line noise that occurs when the
unit transmitter is first turned on. The unit software may (optionally)
wait one character time between transmitter enable and transmission
of the STX (the next character). This eliminates transmitting the guard
character. The receiver ignores this character.

STX (02hex) = Start of text character
This character indicates the start of a message. The receiver should
clear any characters in its receive buffer whenever it receives this
character.

ID (2 ASCII digits) = The unit ID
This field indicates the unit identification number of the unit to which
the message is directed, if the message is coming from the master.
This field indicates the unit identification number of the unit transmit­ting the message, if the message is from a slave.

A message with an ID of "00" from the master is a broadcast message.
All slave units should act on the message (display data, reset, etc.),
but no slave should respond to the message.

TYPE (2 ASCII digits) = The message type
This field describes the purpose of the message that is sent. There are
five message types as shown below:

Message Types

01 Poll This message type is sent by the master unit

to request data from a slave.

02 Data This message type is sent by either a master to

transfer data to a slave or by a slave to transfer
data to the master after receiving a poll. The
TYPE field will then be followed by a SEQ field
and a data field.

03 ACK This message type is sent by the unit that has

4

just received a valid data message.

V550-A20 Operation Manual

04 Wake up This message type is sent by the master. The

05 No data This message type may be sent by a slave

SEQ (1 ASCII digit) = The sequence number
This field starts at zero at power up, and is incremented by one for
each data message sent. When the sequence number reaches nine, it
wraps around to one. This field is only present in a data message.

DATA = The content of the data field
This field contains data, if the message type indicates that data is
included. This field may contain no characters (length of zero; poll,
acknowledge and wake up messages do not have data fields.)

Section 5-

Appendices

slave that receives it should acknowledge the
message.

indicating that the slave has no data to send in
response to a poll. This message is optional. If
the slave has no data, it may ignore the poll.

5

LRC (2 HEX digits) = The Linear Redundancy Check Sequence
The LRC is computed by exclusive-oring all the characters in the ID,
TYPE, SEQ, and data fields, then converting the hex number into two
ascii digits. This mathematical process checks to make sure that the
message is valid.

CR (0Dh) = Carriage return
This character indicates the end of the message. When this character is
received, the unit should check to see that the message started with a STX,
and check that the LRC is correct before accepting it as a valid message.

Message Sequencing

The master unit initiates all data transfers by either sending data to a slave or

requesting data from a slave. This protocol is strictly half duplex; only one
device may be transmitting at any time. A slave device should not transmit
unless it receives a valid message that requires a response--when it does
receive such a message, it must respond quickly (See Timing). The master
unit should respond in a timely manner, but is not under the same con­straints as a slave. The following is the example of processing a Master/
Slave interaction:

Master Slave’s response Master’s response

1. Wake up ACK -none-

2. Poll Data ACK

3. Poll No data -none-

4. Poll -none- -none-

5. Data ACK -none-

5

Section 5-

Appendices

6

V550-A20 Operation Manual

Timing

If a slave unit is going to respond to a poll from the master, it must start its

response within two character times of the end of the carriage return at the
end of the poll.

NOTE: This makes the response time dependent upon the baud rate.

The slave must turn on its transmitter within two character times after

receiving the CR of the master's poll. The slave must place the STX at the
beginning of its response, into its serial port no later than three character
times after receipt of the master’s carriage return.

Once the slave begins transmitting, it must not allow a gap of more than one

half a character time between characters. Most transmissions will take place
under interrupt, so this should not be a problem; however, it means that
serial port interrupts may not be disabled for an extended period of time

during data transmission.

Master:

RTS
TXD

Time:

Slave:

RTS
TXD

S0123456Ps

(CR)

B

A

S0123456PsS0123456Ps_________S01
(FFh) (STX)

C

“S” is the start bit, “0123456” are the character bits, “P” is the parity bit and

“s” is the stop bit.

Typically, the “RTS” line is used to control the transmitter. In this diagram,

“RTS” is high when the transmitter is enabled and low when the transmitter
is disabled (“tri-stated”).

NOTE: The slave’s “FF” may be replaced with a 1 character time (10/baud

rate) delay between transmitter turn-on and transmission of the STX.

Time Limits:

A Maximum: 2 character times (20/baud rate).

6

Minimum: 0.

V550-A20 Operation Manual

B Maximum: 4 character times (40/baud rate).

C Maximum: 1/2 character time (5/baud rate).

Both the master and the slave must disable their transmitter as soon as
possible after transmitting the carriage return at the end of the message. The
transmitter must remain enabled while the carriage return is being sent out,
however. This means that the transmitting device must wait for a “transmit­ter empty” (as opposed to a “transmitter ready”) indication from the serial
port before disabling the transmitter.

This protocol has been designed for a "slow" master to communicate with a
"fast" slave. The only time-critical item for the master is for the master to
release control of the line immediately after spending a message to a slave.
While the slave must respond within a very short time window, there are not
such constraints on the master. The master may have any amount of time
between messages or between characters within its message.

Minimum: 2 character times (due to guard
character + STX transmission time).

Minimum: 0.

Section 5-

Appendices

7

Error Recovery

Error: The slave does not understand a poll message.
Recovery: None. The master will time out, waiting for the slave’s

response, then will go on to the next unit.

Error: The slave does not understand a data message from the mas­ter.
Recovery: The master will retransmit the data message again after
timing out while waiting for the acknowledgment.

Error: The master does not understand the slave’s acknowledgment
of a data message.
Recovery: The master will retransmit the data message after timing
out while waiting for the acknowledgment. The slave will acknowl­edge the retransmitted message and discard it, since the message will
have the same sequence number as the last message received.

Error: The master does not understand the slave’s data message
(response to a poll).
Recovery: The master will time out waiting for the slave’s response,
then continue on to the next poll. Since the slave did not receive an
acknowledgment for the data message, it will retransmit the same
message in response to the next poll.

7

Section 5-

Appendices

8

V550-A20 Operation Manual

Error: The slave does not understand the master’s acknowledgment of
the slave’s data message.
Recovery: The slave will retransmit the same message in response to the
next poll. The master will see that it is a duplicate message, acknowledge
it, and discard it.

Error: The slave does not understand a broadcast message.
Recovery: None. The message will be lost.

The general rules are as follows:

1. Each data message will be acknowledged by the recipient. If a data message

is not acknowledged, the transmitter should retransmit it again up to three
retries. After the third retry, a communications error message should be dis­played and the message discarded (in some systems the message may be re­corded in a disk file or on a printer to prevent data loss).

2. Each new message will have a new sequence number. If a message is re­ceived that has the same message number as the last message received, the
recipient should acknowledge the message and then discard it. The sequence
number should only be checked for equality to the last sequence number re­ceived: there is no requirement that the sequence number must be the next
number expected (although in some systems the master will keep track of “out of
sequence” errors since they would indicate that messages had been lost).

The sequence number zero is a special case, since it indicates that the data
message is the first data message sent since the device sending it has powered
up. Messages with a sequence number of zero should always be processed as
required, regardless of whether or not they are repeated “back to back”.

3. Any message that contains parity errors, LRC errors or an unrecognized
message type should be discarded. No acknowledgment should be sent. In some
systems, the master will keep track of these transmission errors.

4. Any message that contains a correct LRC, has no errors, is of a correct type,

and requires an acknowledgment should be acknowledged even if its se­quence number indicates that it is a duplicate message (the sequence number
is the same as the last message). If it is a duplicate message, it should be ac-

knowledged then discarded. In some systems, the master will keep track of these
duplicate message errors since they would indicate that an acknowledgment had
been lost. A broadcast message (one sent to unit “00”) must not be
acknowledged.

8

V550-A20 Operation Manual

Multidrop Protocol Examples

Message framing:

FFh, 02h, idhigh, idlow, type, seq no, ... data..., lrc0, lrc1, 0Dh

(DEL, STX, ?, ?, ?, ?, ?, ?, ?, CR)

NOTE: The DEL character is used as a guard character to make sure that the
transmission line is quiet for one character time before the STX is sent. The
sequence number only appears on data messages. The LRC stands for “linear
redundancy check” and appears on all messages.

Polling sequence:

1. MUX polls slave at address 01 with the following format:

STX, unit id (2 char), 0, 1, lrc (2 char), CR

Example: STX 0 10 10 0CR

HEX: 02h 30h 31h 30h 31h 30h 30h 0Dh

Section 5-

Appendices

9

2. SLAVE answers the poll with the data in the following format:

STX, unit id, 0, 2, seq (1 char), ...data..., lrc, CR

Example: STX 0 1 0 2 1 A B C D E 7 3 CR

HEX: 02h 30h 31h 30h 32h 31h 41h 42h 43h 44h 45h 37h 33h 0Dh

If no data is available:

STX, unit id, 0, 5, lrc, CR

Example: STX 01 0 5 0 4 CR

HEX: 02h 30h 31h 30h 35h 30h 34h 0Dh

NOTE: It is normally faster to allow the master to time out (which takes three
character times) than to use the "no data" response.

3. MUX acknowledges data in the following format:

STX, unit id, 0, 3, lrc, CR

Example: STX 01 0302CR

HEX: 02h 30h 31h 30h 31h 30h 32h 0Dh

4. MUX polls the next unit . . .

9

Section 5-

Appendices

10

V550-A20 Operation Manual

Protocols Used With RS-232 and RS-422

RTS/CTS (Used with only RS-232)

This protocol stands for "Request To Send" and "Clear To Send". This
is a common type of "handshaking" that goes on between two units.
When one device wants to transmit to another device, it will drive the
RTS line indicating it has data to transmit. When the receiving device
is ready to receive, it will drive the CTS line indicating it is ready.
When you use RTS/CTS it requires the addition of two more wires on
the communication cable. If they are not needed then it is advised not
to use any other additional lines in the cable.

ACK/NAK

This is a software protocol. When a unit receives a message, it indi­cates whether it has received that message correctly. If all informa­tion is received, the unit will transmit an "ACK" (acknowledge). The
ACK is a signal that more information may be transmitted. If the
information is not received correctly, then it will transmit a "NAK"
(non-acknowledge). The NAK is a signal requesting a message be
retransmitted. Most software has a limit to the number of retransmits.
Three NAKS is common.

XON/XOFF

This is a software protocol. XON stands for "transmit on" and XOFF
stands for "transmit off." A unit receiving data may signal the unit
transmitting that it should stop sending data by transmitting and
XOFF (ctrl-S). An XON (ctrl-Q) signals the original unit to begin
transmitting again.

10

Section 5-

12

V550-A20 Operation Manual

Appendices

Appendix C: V550-A20 Read Distance Charts

Standard Scan Head - Optical Performance (Model V550-A20)

Standard Reader - Optical Performance (Model V550-A20)

Narrow Element

Width

10.0 mil (.25 mm)

15.0 mil (.38 mm)

20.0 mil (.5 mm)

30.0 mil (.76 mm)
≥40.0 mil (≥1 mm)

Scan Rate: 500 Scans Per Second

Reading Distance

2.5" - 6.0" (64 - 153 mm)

1.0" - 7.0" (25 - 178 mm)

1.0" - 9.0" (25 - 228 mm)

1.0" - 11.0" (25 - 279 mm)

1.0" - 12.0" (25 - 305 mm)

Maximum

Scan Window

4.8" (249 mm)

5.6" (142 mm)

7.2" (183 mm)

8.8" (224 mm)

9.6" (244 mm)

127 mm
(5.00 in)

101.6 mm
(4.00 in)

76.2 mm
(3.00 in)

50.8 mm
(2.00 in)

25.4 mm
(1.00 in)

12

Not T o Scale

Narrow Element Width

10.0 mil (.25 mm)

15.0 mil (.38 mm)

20.0 mil (.5 mm)

30.0 mil (.76 mm)
≥40.0 mil (≥1 mm)

25.4 mm

50.8 mm

76.2 mm

101.6 mm

127 mm

0.00 mm
(0.00 in)

(1.00 in)

(2.00 in)

(3.00 in)

(4.00 in)

(5.00 in)

152.4 mm
(6.00 in)

Read Distance

177.8 mm
(7.00 in)

203.2 mm
(8.00 in)

228.6 mm
(9.00 in)

254 mm
(10.0 in)

279.4 mm
(11.0 in)

NOTE: These read ranges were obtained using quality bar codes (rated 'A' by
ANSI standards). Results may vary depending on quality of bar codes.

304.8 mm
(12.00 in)

0.00 mm
(0.00 in)

25.4 mm
(1.00 in)

50.8 mm
(2.00 in)

76.2 mm
(3.00 in)

101.6 mm
(4.00 in)

127 mm
(5.00 in)

Scan Window

V550-A20 Operation Manual

Section 5-

Appendices

High Speed Head - Optical Performance (Model V550-A20HS)

High Speed Reader - Optical Performance (Model V550-A20HS)

13

Narrow Element

Width

10.0 mil (.25 mm)

15.0 mil (.38 mm)

20.0 mil (.5 mm)

30.0 mil (.76 mm)
≥40.0 mil (≥1 mm)

Scan Rate: 700 Scans Per Second

Reading Distance

2.5" - 6.0" (64 - 153 mm)

1.0" - 7.0" (25 - 178 mm)

1.0" - 9.0" (25 - 228 mm)

1.0" - 11.0" (25 - 279 mm)

1.0" - 12.0" (25 - 305 mm)

Maximum

Scan Window

4.8" (249 mm)

5.6" (142 mm)

7.2" (183 mm)

8.8" (224 mm)

9.6" (244 mm)

127 mm
(5.00 in)

101.6 mm
(4.00 in)

76.2 mm
(3.00 in)

50.8 mm
(2.00 in)

25.4 mm
(1.00 in)

Not T o Scale

Narrow Element Width

10.0 mil (.25 mm)

15.0 mil (.38 mm)

20.0 mil (.5 mm)

30.0 mil (.76 mm)
≥40.0 mil (≥1 mm)

25.4 mm

50.8 mm

76.2 mm

101.6 mm

127 mm

0.00 mm
(0.00 in)

(1.00 in)

(2.00 in)

(3.00 in)

(4.00 in)

(5.00 in)

152.4 mm
(6.00 in)

Read Distance

177.8 mm
(7.00 in)

203.2 mm
(8.00 in)

228.6 mm
(9.00 in)

254 mm
(10.0 in)

279.4 mm
(11.0 in)

NOTE: These read ranges were obtained using quality bar codes (rated 'A' by
ANSI standards). Results may vary depending on quality of bar codes.

304.8 mm
(12.00 in)

0.00 mm
(0.00 in)

25.4 mm
(1.00 in)

50.8 mm
(2.00 in)

76.2 mm
(3.00 in)

101.6 mm
(4.00 in)

127 mm
(5.00 in)

Scan Window

13

Section 5-

14

V550-A20 Operation Manual

Appendices

High Density Reader - Optical Performance (Model V550-A20HD)

High Density Reader - Optical Performance (Model V550-A20HD)

Narrow Element

Reading Distance Maximum Scan

Width

5.0 mil (.13 mm)

7.5 mil (.19 mm)

10.0 mil (.25 mm)

15.0 mil (.38 mm)
≥ 20.0 mil ≥ (.51 mm)

Scan Rate: 300 Scans Per Seconds

2.0" - 4.0" (51 - 102 mm)

2.0" - 4.25" (51 - 108 mm)

2.0" - 4.5" (51 - 114 mm)

2.0" - 5.0" (51 - 127 mm)

2.0" - 6.0" (51 - 152 mm)

Window

3.2" (81 mm)

3.4" (86 mm)

3.6" (91 mm)

4.0" (102 mm)

4.8" (122 mm)

76.2 mm
(3.00 in)

50.8 mm
(2.00 in)

25.4 mm
(1.00 in)

14

Not To Scale

Narrow Element Width

5.0 mil (.13 mm)

7.5 mil (.19 mm)

10.0 mil (.25 mm)

15.0 mil (.38 mm)
≥ 20.0 mil ≥ (.51 mm)

0.00 mm
(0.00 in)

25.4 mm
(1.00 in)

50.8 mm
(2.00 in)

76.2 mm
(3.00 in)

101.6 mm
(4.00 in)

Read Distance

127 mm
(5.00 in)

152.4 mm
(6.00 in)

NOTE: These read ranges were obtained using quality bar codes (rated 'A' by
ANSI standards). Results may vary depending on quality of bar codes.

0.00 mm
(0.00 in)

25.4 mm
(1.00 in)

50.8 mm
(2.00 in)

76.2 mm
(3.00 in)

Scan Window

V550-A20 Operation Manual

Appendix D:

Dimensions

UNIT: MM (INCH)

■ READERS AND ACCESSORIES

Section 5-

Appendices

15

V550-A20 Bar Code Reader

60

60

(2.36)

70

(2.36)

70

(2.76)

(2.76)

Front Of Scanner

63°

30

30

(1.18)

50

(1.18)

50

(1.97)

(1.97)

DANGER

LISTED

BAR CODE SCANNER

LASER RADIATION

6C15

WHEN OPEN AVOID
DIRECT EXPOSURE

C

TO BEAM

J1

SERIAL

DATE

40

40

(1.57)

(1.57)

STATUS

500mA @ 5VDC

S82S-0305 Power Supply

37.5 (1.48)

9.8 (.38)

75

61

(2.95)

(2.40)

Six, M3.5

Beam Path

4°

Optional Right Angle Exit Attachment
V559-A24

65 (2.56)

4 (.16)

35 (1.38)

7.3

(.29)

V559-A32-A-❏M BCR to OMRON PLC RS-232 Port Cable

DE-15 Female

Connector

1

11

6

Units = MM (In.)
Note: = 2 Meters (78.7 In.) or
5 Meters (196.8 In.)

Backshell

L

L

25 (1.00)

PVC Jacketed

10 (0.39)

Backshell

2 (0.20)

15: Brown

(Red)

11: Blue

(Black)

V559-A25C Programming Kit

DE-15
Female
Connector

II

C

1

Backshell

200 (78.75)

PVC Jacked

Backshell (72)

DE-9 Female Connector

Backshell

UL Class 5 V
DC out. 120 V
AC In Power
Supply

DE-9 Male
Connector

1

Reference

Color Code

6

■ MOUNTING BRACKETS

V559-A26F Mounting Clip

.156 X .281 Slot

19.1

9.7 (.38)

7.1

(.28)

18.3

3.0

(.12)

(.72)

2.3

(.09)

5.3

(.21)

(.75)

V559-A26A Mounting Plate

7.4

PEM FH-632-6

3.7

(1.47)

6.35
(.25)

(29)

8.1

(.32)

25.1

(.99)

(2.45)

(2.45)

3.3 (.13)

62.2

86.9

(3.42)

62.2

72.1
(2.84)

8.6

(.34)

6.9

(.27)

2.3

(.09)

24.6
(.97)

11.2 (.44)

1.5

(.06)

.156 X .281 Slot
4PL

50.0

27.9
(1.97)

(1.10)

15

Section 5-

Appendices

16

V550-A20 Operation Manual

V559-A26D Picket Fence Mounting Bracket

.156 X .281
2 PL

19.05 (.75)

9.65 (.38)

37.6

(1.48)

6.35 (.25)

35.3

(1.39)

31.75 (1.25)

15.2
(.60)

76.2

(3.00)

8.89

(3.50)

25.4 (1.00)

58.4

(2.30)

V559-A25C BCR-to-PC Cable

.156 X .281

2 PL

1.9

(.75)

9.7 (.38)

5.7

(2.25)

69.9

(2.75)

15.7

(.62)

39.4

(1.55)

55.8

(2.2)

6.4

(2.5)

53.6
(2.1)

15.2
(.60)

26.9

(1.06)

V559-A26ZB Cradle Mounting Bracket

6

(.24)

36

50

(1.42)

(1.97)

35.6

11.7

PEM S-632
4 PL

(1.40)

50 (1.97)

(.46)

(.24)

6

25 (.98)

50 (1.97)

12 (.47)

19 (.75)

26 (1.02)

16

V550-A20 Operation Manual

Section 5-

17

Appendices

Appendix E:

Precautions

■ LASER BEAM SAFETY

“Low power” lasers are by definition incapable of causing eye injury within the duration of the blink, or aversion response (0.25 s), and
must be visible (400 nm to 700 nm). Therefore, an ocular hazard can only exist if an individual overcomes his/her natural aversion to
bright light and stares directly into the laser beam. The product requirements for these lasers are two: to have a CAUTION label and to
have an indicator light to indicate laser emission.

The two operational safety rules are:

• Do not permit a person to stare at the laser from within the beam.

• Do not point the laser at a person’s eye at close range.

Follow the instructions on this datasheet for the adjustment and mounting of the V550-A20.
Make sure that the laser beam will not be directly or indirectly reflected into human eyes. The safety distance is approximately 1 m for the

V550-A20. If there is a possibility of laser beam reflection by any objects around the emitter at the time of adjustment, apply paint with a
low light reflection ratio to the objects.

The sensor incorporates laser emission warning light and a “scanning safeguard” feature which shuts off the laser power if the mirror
wheel fails to rotate. This ensures that a stationary laser beam cannot emanate from the scan head.

FDA, IEC Laser Class I IIa II IIIa IIIb IV

Remote interlock connector N/A N/A N/A N/A R R
Key control N/A N/A N/A N/A R R
Emission indicator N/A N/A RRRR
Beam attenuator N/A N/A N/A R R

Note: In the chart above: R = Require; N/A = Not applicable; R1 = Delay required between indication and emission.

1

1

R

■ LASER CONTROL REGULATIONS

The V550-A20 Bar Code Reader meets the standards required by
the U.S. Food and Drug Administration (FDA). This reader also has
been reported to the Center for Devices and Radiological Health
(CDRH). Any service performed on this device should be done so
as to not violate compliance with the

Title 21, Part 1040, Section 10

Labels (FDA Regulations)

Laser radiation warning and information labels are located on the
top side of the bar code reader.

Code of Federal Regulations,

(21 CFR 1040.10).

LASER RADIATION
DO NOT STARE INTO BEAM

.95 mW SEMICONDUCTOR
670 NANOMETERS
CLASS II LASER PRODUCT

■ INSTALLATION

Install the bar code reader in a location where the laser beam will not enter the operator’s eyes directly or from reflection by a mirror
surface. Also, mount the operation indicator (LED) in a clearly visible location. Avoid interference from ambient light shining into BCR’s
window. Avoid excessive dust on window. Avoid scratching window. Avoid subjecting the bar code reader to heavy vibration.

■ MAINTENANCE AND REPAIR

DANGER!

Never disassemble the reader. Users expose themselves to the risk
of laser radiation if they disassemble the device.

Do not attempt repairs or maintenance of the V550-A20. The V550-A20 contains no user serviceable parts. Refer all servicing to an
authorized Omron representative.

17

Section 5-

Appendices

18

V550-A20 Operation Manual

18

V550-A20 Operation Manual

Glossary

1

Glossary of Terms

ACK - A control character sent to acknowledge that a transmis-

sion block has been received.

Address - A unique designation for the location of data or the
identity of a smart device; allows each device on a single
communications line to respond to its own message.

AEL (Accessible Emission Limit) - The average power limitations
of electronic radiation from a laser light source as defined by the
CDRH.

AIM - Automatic Identification Manufacturers, a trade association.

Alignment - The position of a scanner or light source in relation

to the target of a receiving element.

Alphanumeric - The character set which contains letters, digits
and other characters such as punctuation marks.

Ambient Light - The lighting conditions in the scanning area.
Ambient light can interfere with successful scanning of bar codes.

ANSI (American National Standards Institute) - The principle
standards development group in the U.S. A non-profit,
non-governmental group supported by over 1000 trade organiza­tions, professional societies, and companies. Member body to the
ISO (International Standards Organization).

Aperture - Term used on the required CDRH warning labels to
describe the laser exit window.

Bar Code Density - The number of characters that can be
represented in a linear unit of measure. Bar code density is often
referred to in characters per inch (CPI).

Bar Code Label - A label that carries a bar code and can be
affixed to an article.

Bar Code Reader - A device that examines a printed spacial
pattern and decodes the encoded data.

Bar Height - The height of the shortest bar in a bar code.

Bar Length - The bar dimension perpendicular to the bar width.

Bar Width - The thickness of a bar measured from the edge

closest to the symbol start character to the trailing edge of the
same bar.

Baud Rate - A unit used to measure communications speed or
data transfer rate; represents the number of discrete conditions or
events per second.

BCC (Block Check Character) - Used to check transmission
accuracy, a character transmitted by the sender after each
message block and compared with a block check character
computed by the receiver.

Bed Width - The width of the conveyor bed measured in inches.

BEL - A control character that is used when there is a need to call

for attention; it may control alarm or attention devices.

Belt Width - The width of the conveyor belt measured in inches.

ASCII (American Standard Code for Information Interchange) - A

seven bit plus parity code established by ANSI to achieve
compatibility between data services.

Aspect Ratio - The ratio of height to width of a bar code symbol.
A code twice as high as wide would have an aspect ratio of 2; a
code twice as wide as high would have an aspect ratio of ˚ or 0.5.

Asynchronous Transmission - Transmission in which the time
intervals between transmitted characters may be of unequal
length. Transmission is controlled by start and stop bits at the
beginning and end of each character.

Autodiscrimination - The ability of bar code reading equipment
to recognize and correctly decode more than one bar code
symbology.

Autodistinguish - The ability of a scanner to recognize a
selectable number of different symbologies and process the data
without operator intervention; this is a prerequisite feature of
linear bar code scanners employed in open systems.

Bar - The dark elements of a printed bar code symbol.

Bar Code - An array of rectangular bars and spaces that are

arranged in a predefined pattern to represent elements of data
referred to as characters.

Bar Code Character - A single group of bars and spaces that
represent an individual number, letter, or other symbol.

Bidirectional - A bar code symbol capable of being read
successfully independent of scanning direction.

Bit (Binary Digit) -The contraction of binary digit, the smallest unit
of information in the binary system; a one or zero condition.

Bottom Read - When the scanner is mounted under the conveyor
to read codes on the bottom of the boxes or on the front or back
of the boxes. If used there is not enough clearance for a standard
front or back read.

BPS (Bits per Second) - Unit of data transmission rate. See baud
rate.

Buffer - A temporary storage device used to compensate for a
difference in data rate and data flow between two devices
(typically M).

Byte - A binary element string functioning as a unit, usually
shorter than a computer “word”. Eight-bit bytes are most common.
Also called a “character”.

CDRH - (National Center for Devices and Radiological Health)
This organization (a service of the Food and Drug Administration)
is responsible for the safety regulations governing acceptable
limitations on electronic radiation from laser devices. Omron is in
compliance with the CDRH regulations.

Character - A single group of bars and spaces in a code that
represent an individual number, letter, punctuation mark or other

1

Glossary

w

2

V550-A20 Operation Manual

graphic element. Used as part of the organization, control, or
representation of data.

Check Character - A character (usually at the end of the code)
that is used to perform a mathematical check to ensure the
accuracy of a scan of the bar code.

Code Orientation - The relationship of the bar code with
reference to the bar code reader’s reading zone. Typical code
orientations are Ladder and Picket Fence.

Code Length - The length of the bar code measured from the
start of the first bar to the end of last bar.

Code Placement - Variation in code placement affects the ability
of a scanner to read a code. The terms Tilt, Pitch, and Skew deal
with the angular variations of code placement in the X, Y and Z
axes. Variations in code placement affect the pulse width and
therefore the decoding of the code. Pulse width is defined as a
change from the leading edge of a bar or space to the trailing
edge of a bar or space over time. Pulse width is also referred to
as a transition. Tilt, pitch, and skew impact the pulse width of the
code.

Changes to this code presentation cause the bar codes to appear
smaller to the scanner which results in a smaller pulse width.
Each of these variations has a different effect on a scanner
reading these codes and the combination of the variations leads
to more complicated effects.

Tilt=0, Pitch=0, Ske

printing one dot at a time, to complete one line. The print head
then begins printing the next line. Other dot matrix printers use a
stationary print head. These printers typically print one line at a
time and are therefore much quicker than a printer with a moving
print head. Common Problems with dot matrix printing: The
printed ink (bars) tends to expand or “bleed”. This causes the size
of the bars of a code to expand while shrinking the spaces. There
tends to be small gaps between pins of a dot matrix printed bar.
This can lead to problems with scanners because these gaps can
appear as spaces. Ribbon wear is a factor when printing dot
matrix codes. If a printer uses a circular type ribbon (ribbon is
used over and over again) the contrast of the bar code diminishes
over time. A bar code printed with an old ribbon can be more
difficult to read than one printed with a new ribbon. Benefits of
dot matrix printing: It is inexpensive to print bar codes using dot
matrix printers.

Downloading - The process of sending configuration parameters,
operating software or related data from a central source to remote
stations.

DRX (Data Reconstruction) - A technology that collects,
reconstructs, and decodes partial scans to provide valid bar code
data.

DSR (Data Set Ready) - An RS-232 modem interface control
signal which indicates that the terminal is ready for transmission.

DSR (Data Terminal Ready) - Modem interface signal which
alerts the modem that the DTE device is ready for transmission.

Duplex Transmission - See Full and Half Duplex.

Code Quality - The number of scans successfully decoded

during a read cycle.

Communications Protocol - The rules governing exchange of
information between devices connected together on the same
communications line.

Conveyor Speed - The speed that the conveyor is moving
measured in feet per minute. Conveyor speed directly impacts the
time that the code is in front of the scanner; therefore, it affects
the number of reads that are possible.

CR (Carriage Return) - An ASCII or EBCDIC control character
that moves the cursor or print mechanism to the left margin.

CTS (Clear to Send) - The Modem interface signal that indicates
to the DTE device to begin transmission.

Depth of Field - The distance between the maximum and
minimum plane in which a symbol can be read. This range is from
the specified optical throw to the far reading distance.

Dot Matrix Printer - A dot matrix printer is an impact printer that
consists of a series of pins arranged in an array. The pins strike
an inked ribbon against the label stock to form the bar code and
characters. This is the most common type of printer used to print
labels on-demand. Some dot matrix printers use a moving print
head and stationary stock. The print head moves across the label,

EDI (Electronic Data Interchange) - A method by which data is
electronically transmitted from one point to another.

EIA-232 - Interface between data terminal equipment and data
communication equipment employing serial binary data inter­change.

EIA-422 - Electrical characteristics of balanced-voltage digital
interface circuits.

EIA-485 - The recommended standard of the Electronic Industry
Association that specifies the electrical characters of generators
and receivers for use in balanced digital multipoint systems.

Element - Dimensionally the narrowest width in a character - bar
or space.

ENQ (Enquiry) - A transmission control character used as a
request for a response from a remote station. (^E)

ESC (Escape) - A control character which is used to provide
additional control functions. It alters the meaning of a limited
number of continuously following bit combinations. (^[)

ETX (End of Text) - A transmission control character that
terminates a text.

Even Parity - A data verification method in which each character
must have an even number of on bits.

Far Distance - The distance (in inches) from the face of the
scanner to the farthest point at which a code can be successfully
scanned.

2

V550-A20 Operation Manual

Glossary

3

Front Read - The scanner is mounted to read bar codes on the
leading edge of a box as it passes the scanner. In a front read
application, the scanner can be mounted above or on the side of
the conveyor.

Full Duplex (FDX) - Simultaneous, two-way, independent
transmission in both directions.

Half Duplex (HDX) - Transmission in either direction, but not
simultaneous.

Handshaking - Exchange of predetermined signals between two
devices establishing a connection. Usually part of a communica­tions protocol.

Height-of-Scan - The maximum vertical scanning dimension of a
moving beam scanner at a specific distance from the face of the
scanner.

Helium Neon Laser - The type of laser most commonly used in
bar code scanning. Because the laser beam is bright red, bars
must not be printed with red ink since they would be indistinguish­able from the code’s background.

Ink Jet Printing - Ink jet is a non-contact printer that projects
drops of ink at a printing surface. The sprayed drops are
controlled electronically to form a bar code. Common Problems
with laser printing: Its main restriction is that ink jet printing is
usually capable of printing only low density codes. Benefits of
laser printing: Because ink-jet printers are non-contact and non­impact, they can print bar codes on a variety of contoured, rough,
and delicate surfaces. Capable of printing random or sequential
information on labels. Ink jet printers can print directly on cartons
and avoid the cost of label stock.

Input/Output Modules - Since many scanners are operating in
environments that have electrical noise problems, it is helpful to
have equipment electrically isolated from other equipment. The
standard method for isolating inputs and outputs is through the
use of OPTICALLY ISOLATED INPUT/OUTPUT MODULES.
These flexible modules allow the scanner to control high voltage
outputs that are susceptible to noise. Since they are isolated from
each other the noise is not picked up in the scanner.
Omron PLC modules are available as input and output versions.
Maximum current is limited by the input modules. Input modules
can be used for photoelectric trigger inputs. Output modules are
commonly used to control diverters, alarms, external relays, etc.

Intercharacter Gap - The space between two adjacent bar code
characters in a discrete code.

Interface - A shared boundary defined by common physical
interconnection characteristics, signal characteristics and
meanings of interchanged signals.

cable only, such as looping back Request to Send from Clear to
Send pins 4 and 5.

Ladder Orientation - Presentation to the scanner of a bar code
such that the bars are positioned horizontally on the product,
causing them to appear as a ladder. The ends of all bars will enter
the scan window first.

SCAN LINE

DIRECTION OF TRAVEL

Laser Gun - A hand-held non-contact laser scanner that is
usually activated with a trigger.

Laser Scanner - An optical bar code reading device using a low
energy laser light beam as its source of illumination.

Laser Printing - Laser printers use a pulsed or rastered laser
light source to positively charge an image on a dielectric cylinder
of an electrostatic printing mechanism. Toner used in the laser
printing process adheres to the charged portion of the cylinder.
This toner is then transferred to paper using heat. Common
Problems with laser printing: The labels are more expensive
than those used in dot matrix printers. Benefits of laser printing:
Labels can be printed at various speeds. Laser printed bar code
labels are high quality and very accurate.

LCD (Liquid Crystal Display) - A low-power display often used
for notebook computers. An LCD consists of a liquid crystal
solution between two sheets of polarizing material. An electric
current causes each crystal to act like a shutter that can open to
allow light past or close to block the light.

LED (Light Emitting Diode) - A semiconductor generally made
from gallium arsenide, that can serve as a visible or near infrared
light source when voltage is applied continuously or in pulses.
LEDs have extremely long lifetimes when properly operated.

LF (Line Feed) - An ASCII control character that moves the cursor
or print mechanism to the next line. (^J)

Memory Address - A specific location, usually expressed as a
hexadecimal number, in the computer’s RAM.

Interleaved Bar Code - A bar code in which characters are
paired together using bars to represent the first character and
spaces to represent the second.

I/O (Input/Output) - The keyboard and a printer, are examples of I/
O devices. I/O activity is different from computational activity.
When a program sends a document to the printer, it is engaging
in I/O activity; when the program sorts a list of terms, it is
engaging in computational activity.

Jumper - A wire that connects a number of pins on one end of a

Mil - One thousandth of an inch (0.001 inch). Bars and spaces of
codes are commonly referred to as being a certain number of mils
wide. 1 mil = 0.0254 mm.

Misread - The scanner incorrectly decodes a bar code as it
passes through the scan zone.

Moving-Beam - Rather than using a stationary laser beam and
relying on product movement for a single scan, a multi-facet
mirror wheel and motor is used to ‘move’ the beam across the
code several times while in motion itself.

3

Glossary

4

V550-A20 Operation Manual

Moving-Beam Bar Code Scanner - A device that dynamically
searches for a bar code symbol by sweeping a moving optical
beam through a field of view called the scanning zone. Automatic
bar code reader that reads codes by sweeping a moving optical
beam through a field of view. Moving-beam scanners are usually
mounted in a fixed position and read codes as they pass by.

Multidrop Line - A single communications circuit that intercon­nects many stations, each of which contains terminal devices.
See EIA-485.

NAK (Negative Acknowledgment) - A control character used to
indicate that the previous transmission block was in error and the
receiver is ready to accept retransmissions.

Narrow Bar (NB)/Narrow Space (NS) - Smallest code element,
bar or space, in the bar code symbol. Also known as the X
dimension.

NCDRH - (National Center for Devices and Radiological Health)
This organization (a service of the Food and Drug Administration)
is responsible for the safety regulations governing acceptable
limitations on electronic radiation from laser devices. Omron is in
compliance with the NCDRH regulations.

Near Distance - The distance (in inches) from the face of the
scanner to the closest point at which a code can be successfully
scanned.

NEMA (National Electrical Manufacturers Association) - In
order to rate the quality of an enclosure, NEMA has developed a
system for rating all enclosures. A partial list of NEMA enclosure
types is shown below:

NEMA Ratings
3 Enclosures are intended for indoor or outdoor use

primarily to provide protection against windblown dust, rain, and
sleet, and is undamaged by the formation of ice on the enclosure.
4 Enclosures are intended for indoor or outdoor use
primarily to provide protection against windblown dust and rain,
splashing water, and hose-directed water; undamaged by the
formation of ice on the enclosure.
4X Enclosures are intended for indoor or outdoor use
primarily to provide protection against corrosion windblown dust
and rain, splashing water, and hose directed water; undamaged
by the formation of ice on the enclosure.
6 Enclosures are intended for use indoors or outdoors
where occasional submersion is encountered.
12 Enclosures are intended for indoor use primarily to
provide a degree of protection against dust, falling dirt, and
dripping noncorrosive liquids.
13 Enclosures are intended for indoor use primarily to
provide a degree of protection against dust, spraying of water, oil,
noncorrosive coolant.

NVC (Non-Valid Code) - Defines the condition that occurs when
an object has been scanned and no bar code could be decoded.
Usually, this indicates that either no code was on the object or the
code was badly damaged and could not be decoded.

No-Read - When the scanner is unable to decode a bar code as it
passes through the scan zone.

Non-Read - The absence of data at the scanner output after an
attempted scan due to no code, defective code, scanner failure or
operator error.

Odd Parity - A data verification method in which each character
must have an odd number of on bits.

Omnidirectional - Orientation is unpredictable and can be ladder,
picket fence, or any angle in between. A single scan line is not
sufficient to scan bar codes oriented omnidirectionally.

Operating Range - The sum of the scanner’s optical throw and
depth-of-field.

Optical Throw - Measured distance from the scanner’s window to
the near reading distance of the depth of field. Typically, this is
the closest a bar code can be to the scanner’s window and still be
properly decoded.

Optimum Reading Distance - Typically, the center of the depth
of field.

OCR - Optical Character Recognition.

Orientation - The alignment of the code’s bars and spaces to the

scan head. Often referred to as vertical (picket fence) and
horizontal (ladder).

Oversquare - Used to describe bar codes that are taller (from top
to bottom of the bars) than they are wide (from first to last bar).

Package Detection
Trigger - The standard abbreviation for a signal indicating that an

object is passing by the scanner is called Trigger. This signal
indicates to the scanner to start or stop reading.

Trigger Cycle - The time during which the scanner is attempting
to read the bar code.

Hardware Trigger - This is an electrical signal from a relay,
photoelectric or proximity sensor, or limit switch indicating that an
object is passing by the scanner.

Start and End of Trigger - The trigger cycle begins when the
photoelectric sensor is blocked and continues until the photoelec­tric sensor is unblocked. Relay decisions and data communication
take place after the end of the trigger signal.

Serially Controlled Trigger - A serial message from an external
device that controls the trigger cycle.

Continuous Read - This form of trigger requires no input signal.
The scanner is continuously attempting to decode bar codes.
When a scanner is in Continuous Read, there is no way of
determining if there is a package present or a NO-READ.

Package Spacing - This is the spacing between items on a
conveyor. Package spacing is measured one of two ways:
Leading edge of one box to leading edge of the next or trailing
edge of one box to trailing edge of the next. Package spacing is
critical to system operations.

Parameter - A value or opinion that you specify to a program. A
parameter is sometimes called a

Parity Bit - A bit that is set at “0” or “1” in a character to ensure
that the total number of 1 bits in the data field is even or odd.

Pen Scanner - A pen-like device either connected by wire to a
device, or self-contained, used to read bar codes. Requires direct
contact with the symbol.

switch

or an

argument

.

4

V550-A20 Operation Manual

Glossary

5

Peripheral Device - An internal or external device, such as a
printer, a disk drive, or a keyboard, connected to a computer.

Photoelectric Sensor - Used as a presence detector to identify
objects in the bar code reader’s reading zone. A retroreflective
photoelectric sensor emits a beam and is used with a reflector to
create a photoelectric circuit. When the beam is blocked by an
object, breaking the circuit, a signal called TRIGGER is sent to
the bar code reader.

Picket Fence Orientation - Presentation of a bar code such that
the bars are positioned vertically on the product, causing them to
appear as a picket fence. The first bar will enter the scan window
first.

SCAN LINE

DIRECTION OF TRAVEL

Pitch - Rotation of a code pattern about the X-axis. The normal
distance between center line or adjacent characters.

Polarized Laser - A specialized laser source used in high glare
environments.

Polling - A means of controlling devices on a multipoint line.

Protocol - A formal set of conventions governing the formatting

and relative timing of message exchange between two communi­cating systems.

Pulse Width - A change from the leading edge of a bar or space
to the trailing edge of a bar or space over time. Pulse width is also
referred to as a transition.

Queue - Data held in a buffer until it is used or transmitted.

Quiet Zone - Required distance before the first bar and after the

last bar of the code that must be free of marks or printing.

Raster - The process of projecting the laser beam at varied
angles spaced evenly from each other. Typically, the mirror wheel
surfaces are angled to create multiple scan lines instead of a
single beam.

Raster Mirror Wheel - The standard mirror wheel forms the laser
line that is projected from the scanner. Although the mirror wheel
projects 8 separate lines (for an 8-sided mirror wheel), the speed
of the sweep makes it appear that it is actually one line. This type
of mirror wheel is adequate for a ladder orientation because the
laser line will pass from the bottom to the top of the code. For a
picket fence orientation the standard mirror wheel is not always
adequate. One problem facing the picket fence orientation is that
the same portion of the code is being repeatedly scanned. If the
printing quality at this point is not good the label may not be
scanned even though other parts of the label are good. Another
problem for a picket fence orientation is the placement of the
label. If the placement is off enough a single scan line will not
read all the bar codes presented to the scanner.

Read Zone - Area in front of the scanner’s window in which the
bar code should appear for scanning. This zone consists of the
scan window and the raster width (if used).

Reflectance - The amount of light returned from an illuminated
surface.

Request To Send (RTS) - An RS-232 modem interface signal
which indicates that the DTE has data to transmit.

Resolution - The narrowest element dimension which can be
distinguished by a particular reading device or printed with a
particular device or method.

Response Time - The elapsed time between the generation of
the last character of a message at a terminal and the receipt of
the first character of the reply. It includes terminal delay and
network delay.

RPM - Revolutions per minute.

RS-232 - Interface between data terminal equipment and data

communication equipment employing serial binary data inter­change.

RS-422 - The Electronic Industries Association standard that
specifies the electrical characteristics of balanced voltage digital
interface circuits.

RS-485 - The Electronic Industries Association standard that
specifies the electrical characters of generators and receivers for
use in balanced digital multipoint systems.

Scan - A single pass of the laser beam over the code or a portion
of the code. The search for a bar code symbol that is to be
optically recognized.

Scan Area - The area intended to contain a symbol.

Scan Window - The usable length of the scanning beam that

may detect the bar codes. The scan window is perpendicular to
the depth of field.

Scanner - An electronic device that optically converts printed
information into electrical signals. These signals are sent to the
decoder logic.

Scanner Orientation - Relationship of the scan head with
reference to the bar code’s location on products. The scan head
must be set up to insure that all code bars and spaces are
bisected at the same time. Typically, either side read or top read
is used for picket fence or ladder code orientations.

Self-checking - A bar code or symbol using a checking algorithm
which can be independently applied to each character to guard
against undetected errors.

Serial Transmission - The most common transmission mode;
serial, information bits are sent sequentially on a single data
channel.

SERIAL ASYNCHRONOUS TRANSMISSION OF DATA: The
V550-A20 is capable of communicating via the following inter­faces: RS-232, RS-422, and RS-485.

5

Glossary

6

V550-A20 Operation Manual

When data is transmitted serially from a communications port, the
information is transferred between the two devices one data bit at
a time. The data flow can follow one of three different communica­tions modes: simplex, half duplex, or full duplex. Each character
of data within the data flow is transported in a binary bit frame
called the asynchronous data frame.

The start bit begins each frame. A low voltage signal on the data
communications line marks the beginning of the start bit, at which
point the receiving device begins looking for binary zeros and
ones (0’s and 1’s).

The following five to eight data bits (the number depends on the
format used) comprise the binary character.

For error detection, an optional parity bit can define whether the
total number of zeros or ones was even or odd. There are five
different parity selections as shown below:

ODD - last data bit is a logical 0 if the total number of logical 1’s in
the first seven data bits is odd.

EVEN - last data bit is a logical 0 if the total number of logical 1’s
in the first seven data bits is even.

MARK - last data bit is always a logical 1 (i.e.: high/mark).

SPACE - last data bit is always a logical 0 (i.e.: low/space).

OFF (NONE) - last data bit is not present.

The method used to catch errors by using parity bits is as follows:
When the transmitter frames a character, it tallies the number of
0’s and 1’s within the frame and attaches a parity bit. (The parity
bit varies according to whether the total is even or odd.) The
receiving end then counts the 0’s and 1’s and compares the total
to the odd or even recorded by the parity bit. If a discrepancy is
noticed by the receiving end, it can flag the error and request a
retransmission of the data.

A stop bit is used to signal the end of the character. (Stop bits are
typically one or two bits in length. The slower the transmission
speed, the more stop bits required for recognition of the end of
the data frame.)

In addition to the direction of data flow and the data framing, there
are other considerations to insure uniform transmissions. Certain
operating parameters must be followed to prevent the loss of
valuable data.

The first consideration is the speed of transmission, known as
baud rate. Serial data transmission is measured in bits per
second (BPS). The baud rate selections available for the V550­A20 are: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, and

57600. To enable two devices to interact, they must both be
transmitting/receiving data at the same baud rate. If it is not
possible to do this, there must be a buffer (typically additional
storage memory) that accommodates the differences in communi­cations speed.

Many serial communications links also use a flow control system
to handle data transmission in addition to memory buffers.

X-ON/X-OFF Protocol

A common type of flow control is the X-ON/X-OFF protocol. When

a receive buffer nears its memory capacity, the receiving device
sends an ASCII X-OFF signal to the transmitting device, telling it
to stop sending data. When the memory buffer has enough space
to handle more data, the X-ON signal is sent to the transmitting
device, telling it to start sending data again.

ACK/NAK Protocol

Another common protocol is ACK/NAK protocol. When the device
transmits a message to the host, the host responds with either an
ACK (06H) or a NAK (15H). If the host transmits an ACK to the
device, the device deletes its transmit message and the communi­cation sequence is complete. If the host transmits a NAK, the
device will retransmit. The device resends data a maximum of
three times. Optionally this may be changed to 1, 2, 3, or infinite
retransmits by the user. If the device receives a fourth NAK, it will
delete the data in its transmit buffer and display “MAX REXMITS”.

A transmitting device ignores ACK and NAK characters received
during data transmission. If, for example, a device receives a NAK
during a data transmission, it will not resend the data at the
completion of the transmission.

The device also has a retransmit timer. This timer is activated
each time the device transmits data to the host. If the timer runs
for two seconds (this is also changeable) and the device does not
receive an ACK or NAK from the host, a timeout occurs and the
device retransmits its data. Each time the device retransmits
because of a timeout, it treats the timeout the same as receiving a
NAK from the host computer. If the device does not receive an
ACK before the end of the fourth timeout, it will delete the data in
its transmit buffer and display “MAX REXMITS”. The device
deletes data in its transmit buffer and displays the error message
when any combination of four timeouts and NAKs from the host
occurs.

When the device receives a message from the host, it calculates
the BCC for the message and compares the calculated BCC to
the received BCC. If the two values match, the device transmits
an ACK, ending the communication. If the values do not match,
the device transmits a NAK to the host and waits for the host to
retransmit the message. The host, like the device, should
retransmit a maximum of three times.

The sequence number starts at zero (30H) and is incremented
each time a device transmits a new message. When the
sequence number reaches nine (39H), it wraps around to one
(31H). If the sequence number skips a number, the receiving
device knows that a message was lost. If the same sequence
number is received on two sequential messages, the second
message is responded to with an ACK or NAK (as appropriate)
and ignored.

Shielding - Protective covering that eliminates electromagnetic
and radio frequency interference.

Side Read - The scanner is mounted to read the side of a box as
it passes by the head.

Signal - An impulse or fluctuating electrical quantity (i.e.: a
voltage or current) the variations of which represent changes in
information.

Skew - Rotation about the Y-axis. Rotational deviation from
correct horizontal and vertical orientation; may apply to single
character, line or entire encoded item.

6

V550-A20 Operation Manual

Glossary

7

Space - The lighter elements of a bar code symbol formed by the
background between bars.

Specular Reflections - A condition when the laser light is
reflected back from the code’s surface at an angle equal, or
nearly equal, to the angle of incidence of the laser light. This
condition makes it difficult for the scan head to detect the
differences in light variation caused by the code’s bars and
spaces.

Stacked Codes - 16K and Code 49 are examples where a long
symbol is broken into sections and "stacked" one upon another
similar to sentences in a paragraph. Extremely compact codes.

Start Bit - In asynchronous transmission, the first bit or element in
each character, normally a space, that prepares the receiving
equipment for the reception and registration of the character.

Stop Bit - The last bit in an asynchronous transmission, used to
indicate the end of a character, normally a mark condition, that
serves to return the line to its idle or rest state.

STX (Start of Text) - A transmission control character that
precedes a text and is used to terminate a heading. (^B)

Symbol - A combination of characters including start/stop and
checksum characters, as required, that form a complete scan­nable bar code.

Symbologies

Code 39 - A bar code with a full alphanumeric character set, a
unique start and stop character, and three other characters. The
name is derived from its code structure, which is 3 wide elements
out of a total of 9 elements. The nine elements consist of five bars
and four spaces.

Code 128 - A bar code symbology capable of encoding the full
ASCII 128 character set. It encodes these characters using fewer
code elements per character resulting in a more compact code. It
features a unique start and stop character for bidirectional and
variable length decoding, both bar and space character parity for
character integrity, a check character for symbol integrity, a
function character for symbol linking, and spare function charac­ters for unique application definition and/or future expansion.

Interleaved 2 of 5 (I 2of5) - A bar code with a numeric character
set with different start and stop characters. The name is derived
from the method used to encode two characters. In the symbol,
two characters are paired together using bars to represent the
first character and the spaces to represent the second. This
interleaved structure allows information to be encoded in both the
bars and the spaces. A start character, bar and space arrange­ment, at one end, and a different stop character bar and space
arrangement at the other end, provide for bidirectional decoding
of this symbol.

Thermal Printing - Thermal printers use heated print heads and
special heat activated paper. There are two types of thermal
printers. One uses a method similar to the dot matrix printer
where an array of heated dots move along the paper and form the
character or bar code. The other method uses a heated bar and
the paper moves across the bar. Another type of thermal printer is
called a Thermal Transfer printer. The main difference between
this type of printer and a thermal printer is the use of heat
sensitive ribbons as opposed to heat sensitive paper. This type of
printing is permanent on label stock. Common Problems with

thermal printing: Since the paper used is heat activated the
labels will deteriorate over time in a warm environment. Infrared
scanners cannot detect the bar codes and consequently a visible
red light laser must be used to scan these codes. Benefits of

thermal printing: Thermal printers are quiet and inexpensive.

Thermal Transfer - A printing system like thermal except a one-

time ribbon is used and common paper is used as a substrate.
Eliminates the problems of fading or changing color inherent in
thermal printing.

Tilt - Rotation around the Z axis. Used to describe the position of
the bar code with respect to the laser scan line.

Trigger - A signal, typically provided by a photoelectric or
proximity sensor, that informs the bar code reader of the presence
of an object within its reading zone.

UCC (Uniform Code Council) - The organization that administers
the UPC and other retail standards.

Undersquare - Used to describe bar codes that are longer (from
the first to last bar) than they are high (from the top to bottom of
the bars).

Vane Raster - Decreases the amount of scans possible due to a
smaller percentage of scans bisecting the code.

Verifier - A device that makes measurements of the bars, spaces,
quiet zones and optical characteristics of a symbol to determine if
the symbol meets the requirements of a specification or standard.

Vibrating Vane - A variable raster that can have an unlimited
number of raster lines. It covers a larger area and is adjustable.

Wand Scanner - A hand-held contact laser scanner that an
operator guides across the bar code.

Wedge - A device that plugs in between a keyboard and a
terminal. It allows data to be entered either by keyboard or by
various types of scanners.

Wide Bar (WB)/Wide Space (WS) - Widest code element, bar or
space, in the bar code symbol.

Wide to Narrow Ratio - Dividing the size of the wide elements by
the size of the narrow elements of a bar code yields the bar and
space ratios. Bar and space ratios can differ. NOTE: If the narrow
bar and narrow space are equal and the wide bar and wide space
are equal, then you calculate only one ratio.

"X" Dimension - The dimension of the narrowest bar and
narrowest space in a bar code.

XON - A control character sent by the receiving device to signal
the transmitting device to begin sending data.

XOFF - A control character sent by the receiving device to signal
the transmitting device to stop sending data.

7

Glossary

8

V550-A20 Operation Manual

8

V550-A20 Operation Manual

Index

INDEX

1

A

ASCII Chart 5-11

B

Bar Code Basics 1-4
Bar Code Orientation 2-5
Bar Code Symbologies 1-4

C

Cleaning 4-2
Communications 5-2

RS-232 5-10
RS-422 5-10
RS-485 5-2

Connections

C200H Series PLCs 3-15
CQM1 3-13
Terminal 3-7
Other Devices 3-2
Parallel Outputs 3-11
PC 3-5, 3-6
RS-232 3-3
RS-422 3-4
RS-485 3-4
To Interface Box 3-2

D

Dimensions 5-15
Decoding Bar Codes 1-7
Depth of Field 2-5
Disclaimer vi

E

Environmental Specifications 1-3

F

Failure indication 1-8
Far Distance 2-5

G

Good read indication 1-8

I

Idle indication 1-8

L

Ladder 2-4
LED 1-8
LED Functionality 1-9

M

V550-A20 Power 3-8
Modulus Checks 1-6
Mounting

Clearances 2-7
Clips 2-7
Cradle Bracket 2-10
Facts to know Before 2-4
Ladder Bracket 2-8
Picket Fence Bracket 2-9
Plate 2-7

N

Near Distance 2-5
No-read indication 1-8

O

Omron Power Supply 3-8
Operating Parameters 1-3
Optical Throw 2-5
Optimum Distance 2-5
Output Timers 3-11
Outputs 3-11

Connections 3-12

P

Parallel Outputs 3-11
Parts

Mounting Hardware 2-2
Power Supply 2-2

Programming Kit 2-3
PC Connections 3-5
Physical Specifications 1-3
Picket Fence 2-4

Pitch 2-4
Power

Using Local Supply 3-8
Wiring other sources 3-9

Problems 4-4

R

Read Rates 5-12
RISC Processor 1-7
RS-232 With Handshaking 3-3
RS-232 With No Handshaking 3-3
RS-422 point to point 3-4
RS-485 Multidrop 3-4

S

Scanning Range 1-3
Setup 2-11
Size 1-3
Skew 2-4
Specifications 1-3
Status LED 1-8
Supplying Power 3-8
System Description 1-2

T

Temperature 1-3
Tilt 2-5
Trigger Indication 1-8
Trigger Input 3-10
Troubleshooting 4-3

U

Unpacking 2-2

W

Weight 1-3

1

INDEX

2

V550-A20 Operation Manual

2