Leading Margin (Quiet Zone); Polarity - Symbol LS3478-FZ Reference Manual

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 is used to accommodate older
wand decoders that 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 scanner's wand emulation interface creates the Digitized Bar code 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 uses "highs" to
represent bars and "lows" to represent spaces (margins), or "highs" to represent spaces (margins) and "lows" to represent bars.
Scan the appropriate bar code to select the polarity required by the decoder.
*
80 msec
140 msec
200 msec
*
Bar High/Margin Low
Bar Low/Margin High
Wand Emulation Interface 9-7