System information

DS4800 OM QUICK GUIDE
7
STEP 3 – FOCUS THE SCANNER
The reading distance depends on the focus distance of the scanner and should be set according to the
application requirements. The Focus Position is set directly through the focus adjustment screw on the front panel
of the scanner. This screw moves the internal lens of the scanner to change the focal length of the scanner. The
setting is continuous but should not be set beyond the limits "Too Far" or "Too Near" which appear on the display
at the extremes of the focus range. Although the scanner reads across the entire focus range, there are three
guaranteed positions which correspond to the reading diagrams in the Appendix of this Quick Reference Guide.
1. Power up the scanner and wait for the power up
sequence to finish. By default the scanner focus is in
the Unlocked position. The alternating message on the
display shows the mechanical Focus Position.
2. Using a screwdriver turn the focus adjustment screw in
the desired direction clockwise (focus nearer to the
scanner) or counterclockwise (focus farther from the
scanner). The focus position in centimeters and inches
is shown on the scanner display.
NOTE
The value of the Focus Position must be
stored in memory. If the mechanical position
changes by more than the allowed tolerance
of the value in memory, an alarm will be sent.
See the Focus Lock function in step 4,
X-PRESS™ Configuration.
As an additional visual aid during focusing, the indicator LEDs show the relative focus position as follows:
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS

less than 30 cm
 
30 cm NEAR


32-38 cm
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS
 
40 cm MEDIUM


42-58 cm
 
60 cm FAR
READY
GOOD
T
RIGGER
COM
STATUS
SETUP
LEARN
T
EST
FOCUS

more than 60 cm