NCR RealPOS, Руководство пользователя

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4-4 Chapter 4: Operating the Scanner
Hand Scanning
Occasionally you have merchandise that cannot be picked-up and presented to the scanner. The
package may be too heavy or too awkward to hold while trying to position the bar code label.
In these circumstances you can pick up the scanner and take it to the merchandise. The 7893 is
designed so that you can easily pick the scanner up and hold it. Being light-weight, you can
present the scanner to the merchandise with little effort.
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Careful
Label Orientation
Because the 7893 produces a dense, omni-directional scan pattern, labels can be read from
many different angles.
Scan Pattern Location
In order for the scanner to read a label, the center 90% of one scan line must cross the bar
code. To successfully read Code 39 and Interleaved 2 of 5 labels, the scan line must cross the
entire label, not missing any of the bars or spaces. UPC and Code 128 labels can be read by
piecing together two reads of slightly more than half of each side of the bar code. Therefore,
these labels are much easier to read and do not require as much accuracy when presenting the
label to the scanner.
Because of the large scan pattern, you do not have to be very precise when you position the
label. However, the concentration of scan lines is greater in the center of the scan pattern.
Because of this, fewer rejects occur if you try to position the merchandise so that the label is
presented toward the center of the scan pattern.