Symbol Technologies DS 6608 - Manual (Page 138)

DS 6608 Product Reference Guide 10-6
Leading Margin (Quiet Zone)
Scan a bar code below to select a leading margin duration. A leading margin is the time that precedes the first bar of the scan, (in
milliseconds). The minimum allowed value is 80 msec and the maximum is 250 msec. This parameter accommodates older wand
decoders which cannot handle short leading margins.
250 msec is the maximum value that this parameter can attain, however, 200 msec is sufficient.
Polarity
Polarity determines how the digital scanner's Wand Emulation interface creates the Digitized Barcode Pattern (DBP). DBP is a digital
signal that represents the scanned bar code. Different decoders expect the DBP to be in a certain format. The DBP either has the
"highs" represent bars and the "lows" represent spaces (margins), or the "highs" represent spaces (margins) and the "lows" represent
bars.
*
80 msec
140 msec
200 msec
Note