Introduction; Theory Of Operation - Metrologic ScanQuest IS4110 Installation And User Manual

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NTRODUCTION
Metrologic's ScanQuest
designed to be used in OEM applications and decode equipped OEM devices.
The ScanQuest series provides fast, accurate, reliable scanning in a compact,
lightweight package.
Two engine models are available: the IS4125 and the IS4110. The IS4125 has
built-in decoding for versatile OEM operations, while the IS4110 non-decode
engine interfaces directly with decode-equipped OEM devices*. The IS4125 has
flash upgradeable firmware.
* Note: The manufacturer of the end equipment must register with agencies
such as the Food and Drug Administration (FDA). The
specifications required for registration are not obtainable until the
OEM manufacturer uses the ScanQuest Engine in its final
configuration. Therefore, it becomes the responsibility of the
manufacturer who incorporates the scan engine into their product to
comply with all federal laser safety regulations. The manufacturer
must submit a Laser Product Report for the FDA in the US or
similar forms as required by other countries. Metrologic will assist
its customers in complying with the necessary procedures.

Theory of Operation

An infrared (IR) device located behind the scanner window initiates the scanning
process. The IR sensor is active as long as the unit is being powered. When the
laser decodes a bar code, the scan engine transmits the data to the host system.
If the same bar code stays in the field after successfully scanning, the laser stays
on for approximately 4 seconds and then turns off. This prevents unintentional
reads of the same bar code. To read the same symbol more than once, remove
the object from the scan field for approximately 1 second and then present the
symbol again.
If the bar code and object is removed from the field during the scanning process,
the laser turns off. In this stage, the scan engine's computer remains on
"standby".
However, if the object stays in the field, the laser remains on for up to 2.5
seconds trying to detect the bar code. To reactivate the scanning sequence,
remove the object.
®
Engines are miniature laser bar code scanners
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