Specifications

Symbol LS4278 Product Reference Guide2-4
LED Definitions
In addition to beeper sequences, the scanner communicates with the user using a two-color LED display. Table 2-2 defines LED colors
that display during scanning.
Three long high beeps Code 39 buffer is full.
Low/high/low beeps The Code 39 buffer was erased or there was an attempt to clear or transmit an empty buffer.
Low/high beeps A successful transmission of buffered data.
Host Specific
USB only
Four high beeps Scanner has not completed initialization. Wait several seconds and scan again.
Scanner gives a power-up beep after scanning a USB Device
Type.
Communication with the bus must be established before the scanner can operate at the highest
power level.
This power-up beep occurs more than once. The USB bus may put the scanner in a state where power to the scanner is cycled on and off more
than once. This is normal and usually happens when the host PC cold boots.
RS-232 only
High beep A <BEL> character is received and Beep on <BEL> is enabled (Point-to-Point mode only).
Table 2-2. Standard LED Definitions
Scanning LED Indication
Green Flash A bar code was successfully decoded.
Charging LED Indication
Green - Slow Continuous Flash
1
Non-critical battery temperature fault. Battery is above or below normal operating temperature.
If this occurs, do not use the scanner and move the scanner to a location within normal operating
temperature. The scanner can remain in the cradle while the battery warms or cools to normal operating
temperature.
Note: For appropriate charging temperatures, see Table 3-3 on page 3-8.
Green - Fast Continuous Flash
2
Scanner is charging.
Green - Solid Scanner is fully charged.
Amber - Continuous Flash Critical battery temperature fault. Battery is above or below normal operating temperature.
If this occurs, do not use the scanner and move the scanner to a location within normal operating
temperature. The scanner can remain in the cradle while the battery warms or cools to normal operating
temperature.
Note: For appropriate charging temperatures, see Table 3-3 on page 3-8.
1
A slow continuous flash is estimated at 1 flash per second.
2
A fast continuous flash is estimated at 2 flashes per second.
Table 2-1. Standard Beeper Definitions (Continued)
Beeper Sequence Indication