Metrologic MH941 User manual

METROLOGIC INSTRUMENTS, INC.
MH941 Hand-Held
Laser Scanner
Installation and User’s Guide
MLPN 2183
Printed in USA
October 1998

ii
Locations:
USA Corporate Headquarters Europe
Metrologic Instruments, Inc. Metrologic Instruments GmbH
90 Coles Road Dornierstrasse 2
Blackwood, NJ 08012 82178 Puchheim b.
Customer Service: 1-800-ID-METRO Munich, Germany
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
[email protected] [email protected]
www.metrologic.com
ASIA
South America Metrologic Asia (PTE) Ltd.
Metrologic Instruments 31, Kaki Bukit Road 3
Rua Flórida, 1.821-5°Andar-Brooklin #05-08 Techlink
CEP 04571-090, São Paulo-SP, Brasil Singapore 417818
Outside Brazil: Tel: [phone]
Tel: [phone] Fax: [phone]
Fax: [phone] [email protected]
[email protected]
In Brazil:
Tel: [phone]
Fax: [phone]
[email protected]
Copyright
© 1998 by Metrologic Instruments, Inc. All rights reserved. No part of this work may be
®
reproduced, transmitted, or stored in any form or by any means without prior written
consent, except by reviewer, who may quote brief passages in a review, or provided for in
the Copyright Act of 1976.
Products and brand names mentioned in this document are trademarks of their respective
companies.

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Table of Contents
Introduction and Identification .................................... 1
Unpacking List ................................................. 2
Connecting the MH941 Hand-Held Scanner to the Fixed Scanner and
Host Device ................................................... 3
Connecting the MH941 Hand-Held Scanner to the Decoder/Controller .... 4
Parts of the MH941 Scanner ...................................... 5
Audible Indicators ............................................ 6-9
Visual Indicators ........................................... 10-13
Labels ....................................................... 14
IR Sensor Activation ........................................... 15
Scan Field ................................................... 16
Depth of Field and Symbol Specification ........................ 17, 18
Maintenance .................................................. 19
Appendix A
Specifications ...................................... 20, 21
Appendix B
MH941 Scan Head Pin Assignments .................... 22, 23
Appendix C
Warranty and Disclaimer ............................. 24, 25
Appendix D
Notices ........................................... 26, 27
Appendix E
Patents ............................................... 28
Index .................................................... 29, 30

1
Introduction and Identification
When using the MH941 scanner with a decoder not manufactured by Metrologic,
scanner operation is dependent upon your decoder. Since there are many decoders
available, refer to your decoder’s documentation concerning scanner
requirements and operation.
When using a Metrologic hand-held scanner with one of Metrologic’s fixed
scanners, the scanner will operate as follows:
!The IR signal extends approximately eight (8) inches beyond the output
window.
!When the unit is activated by the IR sensor, the red LED will remain on.
This is a visual indication that the scanner is beginning a sequence of
bar code recognition, decoding, and transmission.
!When an object is in the scan field, the laser will begin a sweep to
determine if a bar code is present. If a bar code is not detected within
approximately 2.5 seconds, the red LED will shut off indicating that the
laser is no longer on. To reactivate the scanning sequence, remove the
object and present another.
!When a bar code is recognized, the scanner will decode the bar code
and then transmit the data to the host system. When this occurs, the
green LED will flash and the scanner will beep when the decoding is
complete. At this time, the laser will turn off if the object is removed
from the field. However, if the object stays in the field the laser will
remain on for up to 2.5 seconds trying to detect another bar code. This
feature allows very fast consecutive scans of symbols in close proximity,
such as a wall of boxes or cartons, or bar coded menus. If the same
symbol stays in the field after a successful scan, the laser will stay on for
approximately 3.5 seconds and then turns off. This prevents
unintentional reads of the same bar code. To read the same symbol more
than once, simply remove the object from the scan field for
approximately 1 second and then the scanner can scan the same symbol
on the next pass.

2
Unpacking List
The following will be found in the shipping carton:
!Installation and User’s Guide
!MH941 Hand-Held Laser Scanner
If anything is missing or to order additional items, contact your dealer, distributor
or call Metrologic’s Customer Service Department.

3
Connecting the MH941 Hand-Held Scanner to the Fixed
Scanner and Host Device
In order for the MH941 scanner to maintain compliance with applicable
standards, all circuits connected to the scanner (Example: power supply, host
system, etc.) must meet the requirements for SELV (Safety Extra Low Voltage)
according to EN60950.
1. Make sure the host system is turned off.
2. Connect the head cable of the MH941 hand-held scanner to the cable
terminated with a 9-pin connector attached to the fixed scanner.
3. There are two ways to connect the fixed scanner to the host device
completely:
!Ifthe fixed scanner will be powered by the host system, connect the
communication cable to the host device.
!If the fixed scanner will be powered by an external power supply, the
socket-outlet can be installed near the equipment and can be easily
accessible. Check the AC input requirements of the power supply to
make sure the voltage matches the AC outlet. Connect the scanner’s
communication cable to the scanner. Connect the cable to the host
device. Power up the scanner by plugging in the power supply.
4. Power up the host system.
Note: When the MH941 scanner first receives power, it will immediately
go through a self diagnostic routine, then the green and red LEDs will
flash, and the unit will beep once.

4
Figure 1
Connecting the MH941 Hand-Held Scanner to the
Decoder/Controller
In order for the MH941 scanner to maintain compliance with applicable
standards, all circuits connected to the scanner (Example: power supply, host
system, etc.) must meet the requirements for SELV (Safety Extra Low Voltage)
according to EN60950.
Sincethere are many different types of decoders, refer to your decoder’s
documentation to connect the decoder to your host system. For a listing of the
cable pin assignments for the MH941 scanner, refer to the section MH941 Scan
Head Pin Assignments pages 22 and 23.

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Figure 2
Parts of the MH941 Scanner
Becoming familiar with the features of the MH941 scanner will help when
operating the scanner. The following illustration and list explain the pertinent
parts.
Laser Output Window Thelaser beam emits from this aperture.
Head Cable Ths cable is terminated with a 9-pin squeeze
connector.
The following functions are decoder /controller dependent.
Green LED When the green light flashes on, the scanner has
read the bar code successfully. When the green
light turns off, communication to the host is
complete.
Red LED When the red light is on, the scanner is ready to
scan.
ScanQuest™ Infrared Thescanner has an energy saving feature known
Object Sensor as ScanQuest that senses when a specified time has
elapsed without any scanning. If the unit remains
dormant for this time, the laser and motor will turn
off. In this stage, the scanner’s computer is on
“stand by.” To reactivate the unit, wave an object in
front of the IR (infrared) sensor or pick up the
scanner and direct the scan window downwards.
When the red light comes on, the scanner is ready
to scan.

6
Audible Indicators
There are audible indications that signal the status of your scanner. These
indications are dependent upon the decoder being used. The function of these
indications may not work as described below if using a decoder not manufactured
by Metrologic.
When the scanner is in operation, it will provide warnings with audible
indications. These sounds signal the status of the scan and scanner.
One Beep When the scanner first receives power, the red LED
will blink, followed by the green LED, and then the
scanner will emit one beep. After the scanner
performs this startup sequence, the scanner is ready
to scan.
The green LED will flash and beep once when the
unit successfully reads a bar code. If the green LED
does not flash or the scanner does not beep once,
then the bar code has not been successfully read.
Razzberry Tone If, upon power up, the scanner emits a razzberry
tone, then the scanner has failed diagnostics. Report
this problem to the company where the scanner was
purchased.

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Signaux acoustiques
Il existe des signaux acoustiques qui vous informent sur l'état du scanner. Ces
signaux dépendent du décodeur que vous utilisez. Il peut arriver que les fonctions
de ces signaux ne correspondent pas à celles qui suivent si vous utilisez un
décodeur qui n'a pas été construit par Metrologic.
Quand le scanner est en service, il émet des signaux acoustiques qui vous
informent sur l'état de palpage et de scanner.
Bip sonore
unique la diode rouge se met d'abord à clignoter, puis la diode verte.
Quand le scanner reçoit pour la première fois de l'énergie,
Ensuite, le scanner émet un bip sonore unique. Une fois cette
séquence de démarrage effectuée, le scanner est prêt à servir.
Après lecture avec succès d'un code barres par le scanner, la
diode verte se met à clignoter, suivie d'un bip sonore unique.
Si la diode verte ne clignote pas ou quand aucun bip sonore
n'est émis, cela signifie que le code barres n'a pas pu être lu
avec succès.
Ronflement Si le scanner émet un ronflement une fois activé, ceci indique
un diagnostic d'erreur. Avisez de ce problème l'entreprise
vous ayant vendu le scanner.