Metrologic Instruments MS1890 - Manual (Page 18)

14
S
CANNER
O
PERATION
Visual Indicators
The MS1890 has three LED indicators (yellow, white and
blue) located on the top 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 scanner.
No LEDs are Illuminated
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. Present a bar code to
the scanner and the blue LED will turn on when the IR
detects the object.
Steady Blue
The blue LED is illuminated when the scanner is active and linear illumination
is on or when the scanner is attempting to decode a barcode.
Steady Blue and Single White Flash
When the scanner successfully reads a bar code it will beep once and the
white LED will turn on indicating data is being transmitted.
If the scanner does not beep once and the white light does not turn on, then
the bar code has not been successfully read.
Steady White
When the scanner successfully reads a bar code it will beep once and the
white LED will turn on indicating data is being transmitted.
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 white LED will remain on until the
data can be transmitted.
Alternating Flashing of Blue and White
This indicates the scanner is in configuration mode. A short razzberry tone
indicates that an invalid bar code has been scanned while in this mode.
Figure 11.