Denso BHT-4000 User Manual page 13

• If you cannot distinguish the illumination range covered by the illumination LED
when reading bar codes at distances from the bar-code reading window, you
may turn on the marker LEDs to show the markers
scanned, indicating the readable area as shown below.
The marker LED indication function may be activated or deactivated (default) in
System Mode. (Refer to Subsection 2.4.3, [4] Setting.)
Markers
• Before reading labels, clean them if stained.
• Avoid using the BHT-4000 under direct sunshine. The BHT-4000 might fail to
read.
• To read bar codes on curved surfaces, apply the bar-code reading window to
the center of each bar code at a right angle.
3
Chapter 1. Quick Guide
on the object to be
Trigger switch