Datalogic QW2120 - User Manual

Questions and Answers

C
campbellrachelJul 29, 2025
Why Datalogic Barcode Reader won't decode barcode?
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  Christina BarrettJul 29, 2025
  If the LED is on but the Datalogic Barcode Reader won't decode the barcode, it could be due to several reasons. First, the reader might not be programmed for the correct barcode type; ensure it's set to read the specific type you're scanning. Second, the barcode label itself might be unreadable, so check for any damage or try a different barcode. Lastly, the distance between the reader and the barcode could be incorrect; try moving the reader closer or further away.
J
James WebsterAug 6, 2025
What to do if Datalogic Barcode Reader decodes but doesn't transmit?
- S
  Shawn BoyleAug 6, 2025
  If the Datalogic Barcode Reader decodes the barcode but doesn't transmit it to the host, the reader may not be programmed for the correct host type. Scan the appropriate host type barcode to resolve this issue.
N
nathanirwinAug 13, 2025
How to troubleshoot Datalogic QW2120 Barcode Reader when nothing happens after pulling the trigger?
- S
  Stephen RobertsAug 13, 2025
  If nothing happens when you pull the trigger on your Datalogic Barcode Reader, there are a couple of things to check: * First, ensure the reader is receiving power by checking the system power and making sure the power supply is properly connected. * Second, verify that all cable connections are secure, as loose interface or power cables can prevent the reader from functioning.
M
Michael HernandezAug 21, 2025
Why has the Datalogic QW2120 Barcode Reader's reading ability degraded?
- J
  Juan HarrisAug 21, 2025
  If the barcode reading ability of your Datalogic Barcode Reader has degraded, it might be because the scan window has become dirty. Clean the window using a soft, lint-free cloth dampened with water.

Summary

Connect;Disconnect Cable

Connect Host Interface

Instructions for connecting the reader to host systems via various interfaces.

Keyboard Wedge Interface

Details on connecting the reader using a keyboard wedge interface.

RS-232 Interface

Details on connecting the reader using an RS-232 interface.

USB Interface

Details on connecting the reader using a USB interface.

Aim and Scan

Parts of the Reader

Programming Bar Codes

Resetting the Standard Product Defaults

Instructions to restore factory default settings using a barcode.

RS-232 Interface Programming

Bar codes for configuring RS-232 host types.

USB Interface Programming

Bar codes for configuring USB interfaces.

Keyboard Wedge Interface Programming

Bar codes for configuring keyboard wedge interfaces.

Scanning Modes

Trigger Single

Scanning activated by trigger pull until condition met.

Trigger Hold Multiple

Scanning activated by trigger pull until release or duration.

Trigger Pulse Multiple

Flashing

Always On

Stand Mode

Trigger Object Sense

Troubleshooting

LED and Beeper Indications

Datalogic Scanning Limited Factory Warranty

Warranty Coverage

Describes what the factory warranty covers for hardware defects.

Warranty Claims Process

Explains the procedure for submitting and processing warranty claims.

Warranty Exclusions

Datalogic QW2120 Specifications

General

Type	Handheld
Scanning Technology	Laser
Interface	USB, RS-232, Keyboard Wedge
Storage Temperature	-20°C to 60°C
Connectivity Technology	Wired
Resolution	0.1 mm (4 mil)
Scan Rate	100 scans per second
Supported Barcodes	Code 39, Code 128, UPC, EAN
Operating Temperature	0°C to 45°C
Humidity	5% to 95% (non-condensing)
Drop Specification	1.5 m
Power Supply	5V DC
Print Contrast Ratio	30%