Reading Bar Codes - Denso BTH-300BW User Manual

1.1 Reading Bar Codes

Turn the BHT on, bring the bar-code reading window to a bar code to be scanned, and press the trigger
switch. The BHT turns on the illumination LED to scan the bar code.
When the BHT has read the bar code successfully, the indicator LED will illuminate in green.
* The trigger switch function is assigned to
both of the M3 and M4 keys by default.
• If the BHT fails to read due to specular effects or other factors,
change the scanning angle of the reading window or the distance
from codes as shown at right, and try it again. (Specular effects
occur when the reflection of the light from the bar code becomes
excessively strong. This can easily happen when the reflecting
surface is polished or covered with vinyl.)
• To read bar codes wider than the readable area of the bar-code
reading window, pull the bar-code reading window away from bar
codes.
• The BHT can read bar codes at a maximum distance of 45 cm (17.7")** from the bar-code reading window.
(**For details about the scanning conditions, refer to Appendix A.)
• The bar code reading procedure may differ depending upon the application used, so follow the application's
manual.
• Before reading bar codes, clean their labels if stained.
• Avoid using the BHT in direct sunlight. The BHT might fail to read correctly.
• To read bar codes on curved surfaces, apply the bar-code reading window to the center of each bar
code at a right angle.
• If you pull the bar-code reading window away from bar codes, the actual scanning range will
become narrower than the range covered by the illumination LED.
• The light intensity of the illumination LED will vary depending upon the scanning conditions and
variation of its elements.
Indicator LED
(Illuminates in green when the
BHT has read the bar code
successfully.)
Trigger switch
(M3 key)*
Illumination range covered
by the illumination LED
2
Trigger switch (M4 key)*
Power key