The MS9540 has three LED indicators (green, red and yellow) located on the
head of the scanner. The MS9520 has two LED indicators (green and red)
located on the head of the scanner. When the scanner is on, the flashing or
stationary activity of the LEDs indicates the status of the current scan and the
Green, Red & Yellow (MS9540’s Only) LEDs are off
The LEDs will not be illuminated if the scanner is not
receiving power from the host or transformer.
The scanner is in stand-by mode, and CodeGate is
enabled. Present a bar code to the scanner and the
green LED will turn on when the laser turns on.
Steady Yellow (MS9540’s Only)
The CodeGate button is not active. If a bar code is in the
scan field, the laser will turn on. The bar code will be
decoded and transmitted to the host automatically.
Steady Green
When the laser is active, the green LED is illuminated.
The green LED will remain illuminated until the laser is
deactivated (default mode only).
Steady Green and Single Red Flash
When the scanner successfully reads a bar code, the red
LED will flash and the scanner will beep once. If the red LED
does not flash or the scanner does not beep once, then the
bar code has not been successfully read (default mode only).
Steady Green and Steady Red
After a successful scan, the scanner transmits the data to
the host device. Some communication modes require that
the host inform the scanner when data is ready to be
received. If the host is not ready to accept the information,
the scanner’s red LED will remain on until the data can be
Alternating Flashing of Green and Red
This indicates the scanner is program mode. A razzberry
tone indicates that an invalid bar code has been scanned
while in this mode.
The scanner needs a Flash ROM upgrade if the red and
green LEDs flash alternately and the unit beeps three times
during startup.
Steady Red, Green off
This indicates the scanner may be waiting for
communication from the host.
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