Chapter 12 Troubleshooting - Denso AT20B-SM User Manual

Chapter 12 Troubleshooting

① Cannot scan bar codes.
Trouble
② Reading data is not right.
③ Code data cannot be displayed normally on the computer screen.
④ Even after installation of the Active USB-COM port driver, "Connected" is not shown.
■Barcode label
Trouble
①②
Barcode surface dirt
①②
Barcode is blurred
①
Barcode surface curvature
■Reading Method
Trouble
①②
Specular reflection
（When the lights is focused on the
printed surface of the barcode from
directly above, the Scanner may not
read the
reflection.）
①
Distance from barcode
（Reading may be unsuccessful if the
barcode is wider than the barcode
reading window.）
■Setting
Trouble
①
The type of the barcode to be scanned
has not been set as a readable code.
①
The scanned barcode cantains no
check digit, while the "Enable, with a
check digit" parameter is selected.
①
The check digit contained in the
scanned barcode is wrong.
①
Direct sunlight, ambient light
USB-COM interface :
Trouble
①
It is used except our Active USB-COM
port driver.
①
The Active USB-COM port driver is not
installed.
③④
The USB interface is set to the USB
keyboard interface.
②③
The communications conditions of the
scanner are different from those of the
connected host.
Cause
Cause
code due to specular
Cause
Cause
Countermeasure
Wipe the dirt from the barcode and try again.
Use a barcode clearly printed.
Read the barcode at the center of the barcode reading
window.
Countermeasure
Change the Scanner reading angle and try again.
Move the Scanner slowly toward or away from the barcode and
try again.
Countermeasure
Enable the type of the barcode to be scanned as a readable
code.
Select the "Enable, without a check digit" parameter.
Use a correct barcode.
Read the barcode away from direct sunlight. Adjust the
brightness of the surrounding light when reading indoors.
Countermeasure
Use our Active USB-COM port driver that is designed for the
USB-COM interface.
Switch to the USB-COM interface.
Change the communications conditions of the scanner to
match those of the connected host.
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