KEYENCE BL-N70 Series - Manual (Page 23)

3-1 Scanning
3-3
3
Scannin
g Barcod
es
z Duplicate prevention function
When the laser light runs for a period of time, the reader may accidentally read the same
barcode two or more times. This function will ignore the second reading and any later
readings.
• Factory setting: 0.3 s (This value can be changed. page 4-16)
• After a barcode had been read correctly, to read the same barcode again, either turn off
the laser light temporarily or distance the barcode from the reading window for about
one second to clear the reread prevention time.
z Digit Limit Function
This function will only scan barcodes of a fixed number of characters. Any barcode with
more or fewer characters will not be read and data will not be sent. By default, there are
no limitations.
The two limit functions are:
• Limit All: Assigns a fixed limit to ALL symbologies (ITF, UPC, etc.)
• Limit individual: Assigns a fixed limit to selected symbologies.
z Seven tone buzzer
• The buzzer that signals the completion of reading can be muted or set to seven different
tones ( page 4-14).
The buzzer patterns change according to the following conditions.
• During reading : When reading is complete, the buzzer sounds once.
• During program mode : The buzzer sounds 1 to 3 times depending on the settings.
During program mode, an error alarm sounds when a barcode
other than the specified target code is read.
Note The buzzer used during program mode cannot be muted.