Appendix B: How To Scan A Bar Code; Laser Scanners - Worth Data 7100 RF Terminal Series Owner's Manual

Appendix B:
How to scan a bar code
The 7100 RF Terminals include a built in bar code scanner depending on the model. This section will include information on dif-
ferent scanners as well as how to use each one.

Laser Scanners

If you are using a laser scanner, technique is not critical. The scanners are "point-and-shoot"; you can't miss. Upon triggering the
beam, the laser scans the bar code multiple times (100 scans per second) until it has a good read, at which point it automatically
shuts off. They read from a distance, so they are much more convenient for distance shelf scanning or scanning in tight spots. Dif-
ferent laser scanners have different distance capabilities. The only thing you need to do is line the laser beam up across the bar
code to get it to read. Our laser scanners will read most 1D barcodes.
To scan a bar code using your laser scanner:

Put your RF Terminal in One-Way mode with the host computer program not running; or even unplug the serial cable,

Point the laser scanner at the bar code at about 6" away.

Pull the trigger (or push the Scan Button on the Keypad) 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.
Laser Options
Several options are applicable to all laser scanners that are used with the RF Terminal. These options are: 1) Longer timeout on
the laser reading, and 2) Double decode required.
Longer Laser Reading:
A temporary solution to problem bar codes is sometimes to increase the length of the time the scanner attempts to read, from the default
2-second beam to a 4-second beam.
Double Decode:
The default setting for the RF Terminal is one successful decode results in a "good read". If you are getting incorrect reads, (due
to defective bar codes), a temporary solution is to make the RF Terminal perform two straight identical decodes before beeping,
outputting data, and completing a "good read" read.
Aiming the Laser Dot:
Sometimes it is difficult to see the laser beam and know you are on the bar code, especially if you are attempting to read outdoors
in direct sunlight. On our LT7101, LT7101H, LT7102, & LT7102H Models the laser can be outputted as a brighter dot for a few
seconds, allowing the user to place the dot in the middle of the bar code; then the laser beam starts sweeping for the read. As
shipped, the laser beam never forms an aiming dot, but you can program a number of seconds that you wish the aiming dot to ap-
pear before the sweeping beam (See
Difficult Code 39 Reading:
This setting facilitates reading of difficult Code 39 bar codes such as the Vehicle Identification Number (VIN number) on auto-
mobiles, especially reading through a windshield. VIN numbers are long, often weathered, often dirty, and challenging to read.
To enable the more aggressive Code 39 algorithms necessary to read windshield VINs change the Decode Option to 1 or 2 in the
Code 39 Options menu.
A clean windshield also makes reading bar codes easier.
Chapter 2: Laser Options)
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