L-1
Appendix L
How to scan a bar code
The RF Terminal can be used with either a laser or a CCD scanner. Which
one you choose is dependent upon your application and the quality and
density of your bar codes. This section will include information on
different scanners as well as how to use each one.
Laser and CCD Scanners
If you are using a laser or CCD scanner, technique is not critical. The
scanners are “point-and-shoot”; you can’t miss. Upon triggering the
beam, the laser and CCD scans the bar code multiple times (36 scans
per second) until it has a good read, at which point it automatically
shuts off. These scanners are more expensive, but virtually foolproof.
They read from a distance, so they are much more convenient for
distance shelf scanning or scanning in tight spots. Different laser
scanners have different distance capabilities.
Table M-1
shows the
comparison of all the laser and CCD scanners available from Worth
Data.
Table M-1. Scanner Comparison Chart
6 mil = high density 40 mil = low density 100 mil = very low density (with paper and retro-reflective label stock)
To scan a bar code using your laser or CCD scanner, (whether it be a
handheld or integrated)
1. put your RF Terminal in One-Way mode with the host computer
program not running; or even unplug the serial cable,
2. point the laser scanner at the bar code at about 6” away.
3. Pull the trigger (or push the button on an integrated model)
and line up the beam on the bar code. If you don’t get a read,
vary the distance of the scanner from the bar code by pulling
up or moving down. The idea is to scan through the center of
the bar code.
Scanner
Hi Density
Code 39
UPC
100%
40 mil
Code 39
Paper
100 mil
Code39
Retro-Reflective
100 mil Code
39
LI50 CCD
0.5” – 4”
0.5 - 7”
1” – 12”
na
20” – 40”
LZ300 Laser
0 – 6”
0 – 12”
2” – 41”
7” – 41”
28” – 7.5 ft.
LZ400 Laser
0.5” – 9”
0 – 17”
3” – 44”
9” – 50”
18” – 9.5 ft.
Integrated
Laser in
Terminal
1'" – 7"
0 – 10"
4" – 29"
10" – 32"
18" – 6.5 ft.
PSC Long
Range
7” – 11”
7” - 31”
11” – 9 ft.
24” – 15 ft.
48” – 17 ft.
