Opticon OPN2001 User Parameters There are no barcode changeable parameters in the OPN2001; they are only changeable by host command. Buzzer Parameter Reject Redundant Barcode Low-Battery Indication Comments Disabling will allow same barcode to be stored consecutively. Mode 1 means that a code is allowed only if the previous code is not the same. Mode 2 means that a code is allowed only if none of the previous codes are the same. Determines how low battery condition will be handled.