Motorola LS3578 用户手册

4 - 12 Symbol LS3578 Product Reference Guide

Unknown characters are characters the host does not recognize. When Send Bar Codes With Unknown 
Characters is scanned, all bar code data is sent except for unknown characters, and no error beeps sound. When 
Do Not Send Bar Codes With Unknown Characters is scanned, bar codes containing at least one unknown 
character are not sent to the host, and an error beep sounds.

When enabled, all characters are sent as ASCII sequences over the numeric keypad. For example, ASCII A is sent 
as "ALT make" 0 6 5  "ALT Break."