DS4800 REFERENCE MANUAL
6
1
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 par. 7.4.
1. Power up the scanner
.
For Subzero models,
At -35 °C, a 20-minute
warm-up period is required before the scanner is ready to read
barcodes, the Ready LED blinks.
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
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
less than 30 cm
30 cm NEAR
32-38 cm
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
40 cm MEDIUM
42-58 cm
60 cm FAR
READY
GOOD
TRIGGER
COM
STATUS
SETUP
LEARN
TEST
FOCUS
more than 60 cm
