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check your aimType
aimType:[Value] Describes the type of aiming to use.
trigger: Standard trigger mode. Holding the trigger will start a decoding session. The decoding session ends when a barcode is decoded, scanTimeout occurs or the trigger is released.
timedHold: Aiming lasts for the time specified by 'timedAimDuration' before decoding. The decode will last until the barcode is decoded or scanTimeout occurs.
timedRelease: Aiming lasts until trigger is released. If the timedAimDuration has expired when the trigger is released then a decode session is started until a barcode is decoded or for the remaining time equal to the scanTimeout value.
presentation: Provided to support Kiosk devices. The scanner illuminates when movement is detected in the range of the scanner window. In order to use this mode the scanner must be initiated with a softscan using the scanner.start() method and again after each decode. The device must be equipped with a sensor to detect movement to use presentation mode. See examples below.
pressAndRelease: Scan will continue after the trigger is released until scanTimeout occurs.
continuousRead: Once the trigger is pulled barcodes will continue to be scanned whilst the trigger is held, enabling rapid scanning, to be used in conjunction with sameSymbolTimeout and differentSymbolTimeout. This value is ignored if viewfinderMode is set to 'dynamicReticle'Applicable scanner types: Laser and Imager / Camera
Default: Device specific
Thanks for your response
Now I am able to increase the red laser beam emitting time.