Motorola DS3478 User Manual

10 - 6 Symbol DS3478 Product Reference Guide

Polarity determines how the digital 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 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.

Unknown characters are characters the host does not recognize. Select Send Bar Codes With Unknown 
Characters to send all bar code data except for unknown characters. The digital scanner issues no error beeps. 

Select Do Not Send Bar Codes With Unknown Characters to prevent sending bar codes containing at least one 
unknown character to the host. The digital scanner issues an error beep.