Allen-Bradley 2755-HDG-4 User Manual page 85

Communication Setup (Cable Configuration) 4-29
Beep on BEL
When enabled, the scanner beeps when a <BEL> character is detected on
the RS-232 link. <BEL> may be used to indicate an event such as an
illegal entry.
Note: The scanner will not respond to a <BEL> character between
decode attempts if the scanner is configured for low power operation.
Publication 2755-6.2