Denso BHT-300B Specifications download pdf (Page 16)

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.

Illumination range covered

by the illumination LED

Trigger switch (M4 key)*

Indicator LED

(Illuminates in green when the

BHT has read the bar code

successfully.)

Trigger switch

(M3 key)*

Power key

* 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 ba

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.

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Denso BHT-300B Specifications Page 16