there is a red led and a green led on the head of the ms7120. when the scanner is on, the flashing or constant illumination of the leds indicates the status of the current scan and the scanner.

   

    no red or green led

    the leds will not be illuminated if the scanner is not receiving power from the host or transformer.

   

    steady green

    when the laser is active, the green led is illuminated. the green led will remain illuminated until the laser is deactivated.

    during the power save mode, the laser will turn on and off. during this period, the green led remains illuminated.

   

    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.

   

    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 transmitted.

   

    steady green and flashing red

    this indicates the scanner is in program mode. a razzberry tone indicates that an invalid bar code has been scanned in this mode.

   

    steady red, green off

    this indicates the scanner may be waiting for communication from the host.